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CA3 Proportional Regen

November 28, 2015 11:28:00 AM PST

Since March of this year we’ve quietly rolled out numerous minute improvements in the V3 Cycle Analyst firmware. Now the latest CA3P13 code includes support for Proportional Regenerative Braking with any Grinfineon or Phaserunner motor controller. Simply squeeze the ebrakes for a base regen and use your throttle to dial it in! Have a read of the cumulative release notes for all the details or see the video below for a quick summary.

There’s no need to upgrade if you are happy with how everything is running. But if you use the auxiliary input potentiometer, torque or PAS control, or have a system that supports proportional regen via a 0.0-0.8V throttle signal, then an update for these new features could be worthwhile.

The CA3P13 firmware package can be downloaded from here.

Posted By Justin Lemire-Elmore

Injecting Statorade into Test Hub MotorWe're looking for people who want to participate in one of the biggest recent breakthroughs in the thermal management and hence power handling capability of direct drive hub motors.  If you've got an ebike setup with motor temperature monitoring and routinely see core temperatures in the 100+ oC range, then please read on because this post is for you!

See, earlier this year we built a wind tunnel in our lab for doing full testing of hub motors in conditions that mimic riding in the road. Our motivation was to better understand and model how hot motors get in heavy use at different vehicle speeds, both for predictive reasons and see what techniques can push that working envelope further.

Wind Tunnel Fan Blade powered by Stokemonkey Motor Grin Wind Tunnel for Hub Motor Thermal Testing

Well, in addition to the usual suspects of ventilation holes, vanes, and oil cooling, we also experimented with magnetically active ferrofluids. The theory was that the magnetic fluid would stay put in the air-gap and not leak out everywhere as is common with conventional oil cooling. What we didn't anticipate was just how TINY an amount was required to achieve remarkable effects.  With just 4-5 mL, you could have almost as much cooling benefit as a full cup of messy ATF, with almost no perceptible increase in the rolling drag of the wheel. 

The net effect is that you can run a given motor at about 40% higher continuous torque and power outputs without overheating.  Or correspondingly, a motor that used to run at like ~110-120 degrees in a given situation would now be sitting at a much more comfortable 70-80 degrees. Have a look here at our own GRIN designed prototype hub motor when dissipating just under 100 watts of power.  The steady state core temperature drops from 68 °C down to 43 °C. 

Test Results of Statorade Cooling Effects on Hub Motor

You get this without exposing the motor core to the outside environment like air cooling, and without the impossible sealing complications and additional rolling drag from oil fills.

Statorade PackageWhat we are still looking to understand are the long term stability and maintenance concerns; whether it lasts for years and years or will need frequent or occasional replenishment, and also what if any compatibility issues might exist with magnet bonding adhesives in the motors.  If you want to be part of this endeavor, then we've got 10mL syringes of Statorade packaged and bundled and ready for you. 

Posted By Justin Lemire-Elmore

Things Keep Getting Better

August 20, 2015 4:19:58 PM PDT

One thing for sure about the electric bicycle scene is that things don't sit static, incremental improvements are happening year after year. 



First and foremost is that the 18650 battery cell standard has evolved to specifications that were previously only dreamed of. Without changing anything to the weight or price of their packs, Allcell recently switched to a newer LG MG1 cell model. This turns the 15Ah pack into a 17Ah pack, and the 20Ah pack into 23Ah, and simultaneously cuts the internal resistance and voltage sag almost in half compared the 15 and 20Ah packs. 
 Allcell 20Ah vs 23Ah
All our Allcell packs are of this 2015 model with MG1 cells, and we've added them to the charge simulator and hub motor simulator to see the difference. 

Charge Simulator

It's not just LG that has been releasing cells with both high capacities (>2700mAh) and high current handling capabilities. Sony, Samsung, Panasonic etc. have all been updating their lineups of 18650 cells making this an exciting time for ebike battery capabilities. We've now refreshed the charge simulator to include dozens of new and old cell models, so anyone using the Satiator charger will be able to set their full charge voltage thresholds more precisely for a specific target battery capacity.  Just select the cell type in your pack from the drop-down menu along with the correct series/parallel layout and you'll have a full charge simulation at your fingertips. 
Cell Selection on Charge Simulator

Charging, Satiator 1.0 Firmware

And did we mention charging batteries? For those with a Satiator charging doesn't get much better. We've now released the 1.0 satiator firmware and software suite which has two major new features along with numerous small improvement tweaks to the user interface and charge behavior.
Satiator v1.0 Graph Example
The first of these is graphing! You can now see a real time plot of your charging voltage and current every time you plug in and charge a battery pack.  The graph autoscales sensibly, and looking at the charge graph rather than just the final amp-hours can tell you interesting things, like how much time was spent in constant voltage mode versus bulk charging, and whether the current from the Satiator was reduced due to thermal rollback etc. 
 Satiator Profile Statistics
The second major feature is charge statistics.  The V1.0 Satiator firmware not only keeps track of how many charging amp-hours and watt hours it itself has delivered over its life, it also keeps track of the total cycle statistics on each individual profile too. So now you will have an automatic record of how many cycles and kWhrs of energy you've put into your battery pack, and if you use multiple profiles on the same pack you'll have a breakdown of how often you've charged it to 80% vs 100%, fast charge vs slow charge etc.
This information is invaluable in understanding the life cycle costs of a battery pack under different charge scenarios, and can compliment the data from a Cycle Analyst or similar device that records the discharge statistics. The more people we have collecting real world performance data like this instead of just contrived lab test data, then the better the community as a whole can know what to expect for battery longevity. 
Small tweaks include a new "About Satiator" section of the setup menu that shows current info on the device, the ability to see the previous charge cycle amp-hours even after you have disconnected the pack, the ability to display battery temperature on any pack (not just NiMH/NiCad) by hooking up a thermistor, and a better fault handling behavior when dealing with packs that have problematic BMS circuits and whatnot.
This new 1.0 version of Satiator firmware does require a new software suite in order to display all the new information, and the software and firmware are available for download right now. Please click the appropriate link to embark on the best charging experience ever. 

Field Oriented Controller

And back to the subject of things getting better. The pilot run of BAC500+ field oriented motor controllers that we launched late last year was a good success, but what follows is even better. The PhaseRunner is based on ASI's BAC800 controller units with a special heatsink, potted enclosure, and cable harness all made here at Grin. It can run at higher voltages (95V instead of just 60V max), higher phase currents (80A rather than 60A), and has a smaller and narrower footprint, all at the same price. Many more details are available by reading through the endless-sphere thread starting here
PhaseRunner Motor Controllers

We're hoping to make this a standard and stock cornerstone of our controller and kit offerings by fall of 2015, but in the meantime we're still producing a couple of these a day for advanced technical users. 

Alex DM24 Rims with 3D Drilling

DM24 Rim with 3D Drilling

Anyone who has laced a large diameter hub motor into a small diameter rim will be more than familiar with the problem of spoke angle. Just a single cross pattern will produce an angle that puts large stresses on the nipple and bends the spoke, something we've modeled on the hub motor spoke calculator for people to anticipate. Alex Rims has been offering 3D drilling of their spoke nipple holes in the rim to allow the nipple to exit at an angle rather than radially inwards, and we got a large number of these in a 20" rims size drilled out to 14 degrees which should allow you to do single cross lacing jobs when previously only radial would make sense.  

Unfortunately, the 3D drilling is not compatible with their rim eyelets at the moment, so for the 24", 26" and 700c DM24 rims we opted to go for stainless eyelets instead. 

Shop Video Tour

Last week we also had an unexpected visit from Court, who runs the excellent electric bicycle review site  What was supposed to be just a short quick shop tour ended up taking a good chunk of the afternoon, which Court kindly recorded and uploaded to youtube. If anyone is curious to see the inner workings here at Grin and has time to spare, enjoy the video.

Posted By Justin Lemire-Elmore

Trip Analyzer Update - Oops

August 7, 2015 1:55:38 PM PDT

Sometimes we do a lot of work on a project and totally forget to announce it anywhere. That happened a few months ago when we finished a large round of enhancements to the online CA Trip Analyzer software, courtesy of the hard work of our UBC co-op students Mila and Shivan. Then moved onto our next endeavors and forgot to make a peep. 

The latest enhancements apply most specifically to the V3 Cycle Analyst devices, since the software now shows all the extended data such as human torque, motor temperature, pedal cadence etc. This extended data is shown on a second graph allowing you to customize not only which items to display, but also whether they scale on the left or right axis and how or if numeric stats on the right should be computed.

Example of Cycle Analyst Trip Analysis Software

We've also made it so that named trip sections are highlighted in different colours and shown on the slider bar, allowing for easier visualization of the trip regions when communicating or sharing adventures. All of these capabilities are now summarized in the FAQ section. As always we appreciate feedback from people using these web tools. If you've got an interesting trip upload to share, please send the URL our way.  

Posted By Justin Lemire-Elmore

First Newsletters and Videos

July 10, 2015 3:30:41 PM PDT

Grin's First Newsletter

This February we quietly added a newsletter signup to our homepage for people wanting an active update on new stuff at Grin. Many hundreds have subscribed we're glad to have gotten the first newsletter out the door this weekend. It's a long one but worth a look, future updates are expected to be shorter and sent out every few couple months to keep you abreast of our undertakings:

If you're interested in having Grin updates sent to your inbox instead of sending your browser back to our website blog all the time then consider signing up. There is no need to have an account on our store site, simply enter your email address in the box to the right. However, if you do have an accont then you can easily enable newsletter subscription from inside your account settings too.


How to subscribe to newsletter from account settings

Say Videos

Dan Sgzatti in Full GloryAs part of our effort to be a tad more proactive in sharing the good word on our products, our resident dealer rep and sales guy Danial Sgzatti has produced an excellent little intro video on the Cycle Satiator charger. This short clip is meant to help highlight the Satiator benefits without having to read tons of text on our site, and we'd welcome you to have a look.


Click to see Satiator intro video in Youtube

Posted By Justin Lemire-Elmore

On the Subject of Cargo

June 18, 2015 11:18:22 AM PDT

Well, the informal Cargo Bike Championships were a real blast, with last minute entries bringing in a total to 37 participants. The event spirit wonderfully captured on video by Iaco Rocher here:

    Click to see video summary of event      Members of the Grin team and their rides


We wanted to publicly congratulate the two winners of prizes sponsored by Grin. Philip Marciniak got a V3 Cycle Analyst and LED light kit for the best custom built ebike for his scratch build longjohn style bike used for his appliance repair business.

And Fabrizio Cross got a $200 gift certificate for setting the electric speed record for the fastest lap on full scratch-built semi recumbent bike, with room for both children on the back. This is one of those builds that blurs the lines a bit between ebikes and higher powered 2-wheelers, but the wide scooter wheels and full suspension do wonders to smooth travel on the bumpy roads of his hometown on Hornby Island. 

Side View of Bare Frame

Also a shout out to Stuart and the Lecicle, who showed up with the best family bike designed by kids that we’ve ever seen!

Yuba Cycle Stokers

After a very successful pilot run, we’ve now done a full production and release of the Cycle Stoker kit for Yuba Mundo cargo bikes. Thanks to all those who’ve participated to resolve any kinks as we expanded this kit to the popular Yuba platform. We’ve updated the Cycle Stoker info page has recently to include a lot more details about this mid-drive option to answer questions for anyone else who is considering it

For those still awaiting a Cycle Stoker kit for Big Dummy cargo bikes, that will be next inline on this project. 

Posted By Justin Lemire-Elmore

Bike To Work, Bike for Errands, Bike to BBQ!

May 28, 2015 12:50:39 PM PDT

This has been an awesome time for alternative transportation in Vancouver. Not only did we learn that non-car trips (biking, walking, transit) outnumbered private vehicle trips for the first time ever; cycling use in the city jumped another 20% last year, the hopelessly archaic Business Improvement Association has finally acknowledged that bike lanes are good for business, and the weather and turn-out for Bike to Work Week has been amazing.  We’d love to know exactly how much of a role electric assist is playing in that, but it’s no doubt a very large factor for some. 

Cargo Race TrackLet’s not forget to celebrate all this at the wrap-up BBQ on Friday at Creekside Park besides Science World. The full details of the Cargo Bike Championship have been posted to the participants. It includes a race where you pick up more cargo on each lap and a host of prize categories, and should be good fun with nearly two dozen cargo bikes of all types in the mix.


For the categories of “Best Custom Built Cargo Bike”, and “Fastest Time with Electric Assist” we’ll be awarding winners with their choice of:

  • A) A Cycle Satiator universal battery charger.
  • B) A Cycle Analyst and front/rear ebike lighting system
  • C) A $300 Grin Credit towards the purchase of an eZee conversion kit, or
  • D) A $200 gift certificate for anything at Grin

For all the other categories we’ll be giving away gourmet popsicles from our friend Johnny, who’s been making and selling unbelievably tasty cold treats from his mobile trike:

Because of this event, we will be closing our shop early on Friday at 4pm so that all our staff can participate. To our local customers and friends, we hope to see you there too!

Commuting by Big Dummy and Haul-a-Day

Posted By Justin Lemire-Elmore

New CA2 Firmware to Test

May 13, 2015 3:14:46 PM PDT

The classic V2 Cycle Analyst series hasn’t seen a firmware update in several years, and it’s time we fix that.  For anyone with a V2.3 Cycle Analyst, we’ve now got two more firmware options that you might like, both featuring the battery state-of-charge (SOC) icon previously only available with the V3 devices.

CA Marine Firmware Splash ScreenThe first is a special Marine Firmware that we developed for a Dutch dealer. This trimmed down code is ideal for anyone using the V2 CA as a power monitoring device in applications where there is no need for speed and distance tracking, just watts, amp-hours, volts etc.  The Auxiliary Potentiometer Input has been re-purposed as a temperature input for thermal monitoring if desired too.

Marine Firmware, Main Screen Main Screen with Temperature Percent Recharge Screen
 Main Screen showing Amp Hours and Battery SOC Icon  Amp-hours toggles to temperature readout if enabled  Display of recharge percentage and recharging Ah

CA V2.4 Splash Screen

The second firmware update is a general purpose V2.4 release for vehicle usage. To a first order, this is very much like the V2.3 CA code with the addition of a battery icon, but there are many changes in the back-end and setup menus too which should be appreciated, including better rejection of spurious speed readings if the spoke magnet and pickup sensor become misaligned.


CA V2.4 Features

You can update any of the V2.3 Cycle Analyst devices (But not V2.25 and earlier) using the same software tool and programming cable as a V3 CA, as explained here. This update will reset your total life cycle statistics, so before reflashing be sure to write down your total Amp-hours, Distance, Battery Cycles, and other custom settings so that you can re-enter those values later.

So if you have an inkling to try out the latest, please load the code above and send us your feedback.

Posted By Justin Lemire-Elmore

Get your Cargo Rolling - May 29th

May 8, 2015 11:23:39 PM PDT

There are few things we love more than riding around Vancouver hauling stuff on electric cargo bikes; turning heads and getting high fives and thumbs up while shuttling goods back to our shop at Grin. So we were smitten to see that Vancouver will be hosting it’s first every Cargo Bike Championship on May 29th, right at the end of Bike to Work Week, courtesy of Modacity and HUB. Read about it right here.

250 lbs of Scrap Steel haul with Big Dummy Electric Cargo Trike with Trash Load 12 Foot Lumber on an Edgerunner with Wide Loaders

What’s a Cargo Bike Championship exactly? We don’t really know, but we figure it’s going to involve some kind of informal cargo hauling contest, some kind of vehicle rally, some kind of judging, and of course prizes! On that front we’re going to be sponsoring some very big awards, like Satiators and Lumenators and perhaps even a full conversion kit. We’ll update on the details as they materialize.

In the meantime though, if you ride a cargo bike of any kind here in Vancouver, whether for transporting kids or your full suite of work tools, then come help us to showcase this other side of utility cycling. Modacity is looking for participants to register their bikes by May 18th, so get your details in and lets make this a great little rally. It's timed to coincide with the wrap-up BBQ at creekside park from 4-7pm, where there will be tons of cyclists gathered and free foodstuff too. 

Posted By Justin Lemire-Elmore

More Goods on Amazon

May 2, 2015 6:56:31 PM PDT

Purchase a Satiator via

Last year around this time we got our Torque Arms listed and stocked at Amazon for faster and cheaper shipping to US customers. Well we can now add to the mix the Grin Lumenators Lights, USB Power Adapter, and Cycle Satiator Charger too. So if you're after just one of these items and are in the United States, then you should find Amazon can deliver it to you quicker than we can here in Canada. 

Posted By Justin Lemire-Elmore

Vancouver EV Expo, Friday Apr 24th 5:30-9:30pm

April 20, 2015 3:39:28 AM PDT

In our first community event of 2015, we’ll be participating in the BC Sustainable Energy Association’s (BCSEA) electric vehicle faire, taking place this Friday evening at Science World from 5:30-9:30pm.   This is being promoted as an opportunity to learn about EV’s, meet local EV businesses, and test ride any number of electric vehicles. Additional information is here:


So come on out, it’s not free but it should be worth it. We’ll be there to balance out the heavy presence of commercial electric cars with a full suite of electric cargo bikes, trikes, folders, and longboards, all available to test riding.  

And if you do have a nice homemade electric bike or other PEV that you’d like to show off, it’s not too late to sign up as an exhibitor. Please either contact us or BCSEA directly to be a part. You can help bring awareness to the massive impact that ebikes can have as a viable transportation option.  After all, you don’t need 4 wheels, a roof, a trunk, and 2000lb of steel and batteries to get around town and have fun doing so.


Posted By Justin Lemire-Elmore

Conversion Kits Better Explained

April 15, 2015 12:52:09 AM PDT

We’ve recently changed how ebike conversion kits are presented on our website in a way that hopefully makes it easier to find the best option for your bike. At the center of this is a new conversion kit summary page that highlights the key features of every Grin kit and the applications and bicycle types where they shine.

Our mission is always to create conversion kits that use universal standards and interchangeable components, and address interesting niche applications that aren’t well serviced by other “one size fits all” systems.

Posted By Justin Lemire-Elmore

Bromptons Included

April 15, 2015 12:51:38 AM PDT

On the new kit front, you’ll now see two dedicated Brompton specific packages based around the Crystalyte NSM and SAW20 hub motors. We’ve customized the cable lengths and controller / Cycle Analyst mounting brackets to fit neatly on these unusual bike frames, had the motor axles machined with a 8mm axle flats and a 75mm length to be a drop in fit with the Brompton forks, and even made custom 8mm mini torque arms too. No fork spreading or dropout filing required, these kits are ready for primetime, and feature the same upgrade options of PAS and Torque sensing pedalec control as our other systems.

Brompton Kit

Have a look at the Brompton Kit info page where we’ve explained the options and compiled a detailed installation guide with plenty of photographs and pointers on how to put things together right. This is our first time preparing a kit install guide in many years, and we’d welcome any feedback as this will become a template for other conversion kit installation pages soon to come. 

Posted By Justin Lemire-Elmore

Unlaced Front and Rear eZee HubsWe’ve got a nice update for those like doing things a little bit custom. The high performance V2 eZee hub motors have only traditionally been available as part of a complete built up wheel, laced with a rim, tire and tube, which added a lot of wasted expense for those wanting a different diameter or rim type.  Well we had a recent shipment arrive of pure unlaced eZee motors both front and rear, permitting eZee motor systems in a custom wheel build.

Included in these unlaced motors is a new fast 350 rpm winding, which will help 16” and 20” wheels get up to a decent road speed without the need for a high voltage battery. They’re a bit quicker than the normal 300 rpm motors that are in the 20” eZee kits, and have been added to our simulator page too.    

Custom Builds

Custom Laced Hub MotorTo facilitate the purchase of custom built wheels, we’ve also created a new part on our store site that lets you select any available hub, spokes, and rim option from a dropdown menu. That enables you to specify the best hand-laced motor wheel for your project rather than relying on stock kits.


A Suitable Fat Rim

DHL65 Fat RimOne of the rim options you’ll see listed is a 65mm wide Weinmann rim for fat tire bikes. With the recent updates to our spoke calculator it’s much easier to figure out the optimum lacing and dishing strategy for a fat tire build and these particular rims have a close enough left and right hole offset that they can work well with most motors.  

If you are doing a custom fatbike conversion, the best approach is to select a rear hub motor and use this on the front fork of your bike for a front wheel drive. Most fat bike forks have a 135mm dropout width, the same as a standard rear mountain bike hub. 

Posted By Justin Lemire-Elmore

Spoke Calculator Phase 2 Enhancements

March 7, 2015 9:45:19 PM PST

Well who would have guessed that the improved spoke calculator we put online last summer has been used to make over 75,000 spoke length calculations! We imagine only a small fraction of those turned into laced up hub motors, but it feels good to see our tools get put to such good use.

Spoke Calculations Performed to Date
We've now wrapped up the the second phase of this project to include a dimensionally correct cutaway edge view of the laced motor so that you can see the effects of dishing, spoke hole offsets, and even of lacing the spokes with the spoke elbows inside or outside of the motor flange. We're trying to turn this into the ultimate wheel lacing resource for ebike enthusiasts and welcome any additional feedback. Have a look and play around!

Ebike Spoke Calculator with Side and Edge View Drawings

Under the calculator results are full descriptions and explanations for the various fields, and we've updated all the hub motors in our database to include the offset from the flanges to the axle center for dishing considerations.

One of the key issues we wanted to illustrate was the importance of having the spoke elbows on either the inside or outside of the hub flange in different scenarios. This can be a significant consideration when lacing hub motors which often have spoke flanges spaced much closer together than a normal bike hub. We also wanted to make it easier to let people do hub lacing into Fat Bike rims which tend to have large offsets between the left and right holes, and included a simple "swap spokes" button to gain better triangulation.

Swapping left and right spoke holes for fat bike rims

Posted By Justin Lemire-Elmore

Satiator Charge Simulator

February 11, 2015 2:03:23 AM PST

Hey guys and gals, check it out:

Satiator Charge Simulator Example Graph

We've completed what is surely the first online lithium battery charging simulator, with accurate renditions of the constant power, constant current, and constant voltage charge regimes. With this tool, not only can you see just how long it will take to charge a given battery type using the Cycle Satiator, you can also figure out the exact voltage profile for partial charge levels, and then download the resulting profiles right to your Satiator Charger.

We're hoping that this takes some of the mystery out of designing custom charge profiles for your battery and encourages you to produce partial charge routines to enhance your pack's longevity. With good management you can often make your expensive lithium battery pack give 2-3 times as many discharge cycles as it would with the stock generic chargers, and have the satiator handily pay for itself just on reduced battery replacement costs alone.  

Posted By Justin Lemire-Elmore

Smooth Controllers, Stoked Yubas, Happy Holidays

December 19, 2014 2:06:45 AM PST

Hey you'd think with the launch of the Satiator we'd take a little break and relax for the holidays, but not at all.

Field Oriented BAC500+ Controllers

Many of our custom EV projects over the past few years have made use of an advanced Field Oriented Motor Controller from ASI (Accelerated Systems Inc.) of Toronto, rather than the more generic imported Infineon devices. We've talked about these before, and have now made a small pilot batch generally available to the enterprising public.

Some Evolution of the BAC500+ Field Oriented Controller Enclosure

Made almost 100% in Canada, this BAC500+ controller in a hardcoat anodized CNC'd enclosure can measurably increase your motor efficiency and torque output at low speeds, run sensorless with even the highest RPM motors, use field weakening to increase the top-end speed, and remove the motor buzz from even noisiest of hubs.

Dyno Graph of Improved Low End Torque and Efficiency Dyno Graph at 3 Different Levels of Field Weakening Plot of H3525 Unloaded Motor RPM v Field Weakening Current

For more information, have a look the descriptions and test results in the ES forum thread. We are down to single digit quantities remaining for those who who are tech savvy and want to taste the future of ebike control.

Cycle Stoking a Yuba

On another front, we renamed the Right Side Drive Stokemonkey to the Cycle Stoker several months back, and are now pilot testing a new model custom fit for the Yuba Mundo cargo bikes. Mid-drives like the Bafang BBS02 have made the rounds lately but this stands apart:

Cycle Stoker Prototype on a Yuba Mundo

  • Patterson 2-speed crankset, gives the equivalent of a 62T chainring for unprecedented high speed gear ratios even at a comfortable pedal cadence
  • Provides true Proportional Torque Assistance with all the custom settings of a V3 Cycle Analyst to dial in the desired performance
  • Uses of standard bicycle chain and bicycle components for the entire drive transmission, no special proprietary gears in the mix. 

If you have a Yuba Mundo bike and like being an early product tester to help work through any early release kinks, then please be in touch as we should have a half dozen kits ready by early January.

Grin Staff wishing you a Merry Christmas, (you won't find us in matching uniform like this too often.)

Finally, we at team Grin want to wish you all a Merry Christmas. We'll generally stay open with reduced staffing during the holiday but should still keep up on all the online orders. And in case you didn't see it, the -20% Satiator Promo for loyal customers will continue until the end of the December if you want to treat yourself to a little gift.

Posted By Justin Lemire-Elmore

Blazing Speeds but Lost Emails

December 4, 2014 1:23:51 PM PST

We apologize that our webpage was down for maintenance much of yesterday. We were upgrading servers in order to make our site faster and better at handling high traffic. Now that the migration is finished you'll notice quite a dramatic improvement in the page load times when your browse our website.  

Unfortunately there was a time window yesterday evening and night when emails to any address could have bounced. So if you sent us an message and don't receive the usual timely reply, there is a chance we did not receive it and you might want to forward the email along again.  Otherwise we hope you all enjoy the much snappier ! 

Posted By Justin Lemire-Elmore

Satiator Launch

December 1, 2014 3:42:21 PM PST

This is a proud moment for all of us at Grin. After three years of development and 6 months of beta field testing we’re now launching the Cycle Satiator in full capacity. For anyone who’s been fed up with the overall shoddiness of battery chargers available for electric bikes, this should get you salivating.

Please click the link above for more information, and also check out the endless-sphere discussion thread for the most immediate updates on firmware and software enhancements and our development vision.

Toast from the Satiator Engineering Team (Dan, Michael, Justin, Rob, Robbie, Dallas, +Shivan [not shown])

We managed to bring the Satiator into production without any kickstarter campaign or venture financing. Instead, this whole project was made possible by all the loyal customers and enthusiasts who caught the ebike bug and have been patronizing our shop over the years. Your business and your encouraging feedback has kept us motivated to keep developing new ebike technology, and well that's what we've been doing.

Time to Pay You Back

As a thank you, we’re giving a 20% ($60) discount on the Satiator from now until Boxing Day to anyone who has purchased either 2 or more Cycle Analyst devices from us, or has spent over $2000 in other parts from our shop. If you fit in this camp and like what you see, then simply email us with your order history and make sure you have an account setup on our current website, and we will hook you up.  Your faith in our business always has been and will be much appreciated. 

Posted By Justin Lemire-Elmore

We all but gave up on Nine Continent hub motors in recent times for a lot of reasons (inadequate disc clearance, poor paint job, inconsistent wheel lacing, improper connector crimping etc.). But things change, and we were truly blown away when we got samples of their latest 2014 model of rear motor this summer. It was one of several motors we’ve been evaluating that finally uses splined cassette freehubs rather than screw-on freewheels for the rear cog set.

9C Cassette Motor Features

  • Shimano Compatible Cassette Freehub
  • 30mm Wide Stator Core (vs 27mm in older model)
  • 20mm Clearance for Disk Calipers
  • Side Axle Wire Exit
  • 10K Thermistor for Temperature Sensing
  • Paired spoke holes
  • Diecast aluminum stator core
  • Future tech styling


We’ve now got a large supply of these available in a very fast (3004), fast (3006), and medium speed (3007) winding, both as bare motors or in a complete kit form.


The performances are fully modeled on the motor simulator (as NineCont 300X), on our spoke calculator, and we’ve produced a mechanical diagram of all the key dimensions from our 3D CAD model. That should be sufficient data to have you sold!


  9C Cassette Motor Dimensional Diagram  Purchase Nine Continent Cassette Bare Hubs  Purchase Cassette Motor Kit

Motor Dimensional Diagram

Bare Hubs for Sale Complete Conversion Kits

We also made the decision to stock them all unlaced, given you the option of low cost international shipping, or having a quality hand-built wheel custom laced into the rim of your choice with butted Sapim spokes. As part of this process, we’ve increased the range and type of rims we carry, adding a new PR17 series in 20”, 24”, 26”, and 700c. All these goods are in stock and ready to ship for your winter build projects. 

Posted By Justin Lemire-Elmore