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One of the things about meshing complex electrical and mechanical systems together is that occasionally things can go wrong! We've seen more than our fair share of ebike issues come and go over the years - from shot ball bearings, seized freewheels and stripped threads to defective hall sensors, blown mosfets and connector issues. We've learnt a lot along the way and continue to use this experience to help create more efficient and more reliable electric bikes...

Ebike Wheel Building Tips

There are many good print and online references for lacing bicycle wheels. Many will defer to Sheldon Brown, Brandt's Bicycle Wheel Book, and others. However, a lot of the points and details with a conventional bicycle hubs don't necessarily apply to hub motors with their much larger flange diameter.

Why Hub Motors are Awesome

Learn why we chose to keep our focus primarily on hub motor drive systems over mid-drive conversions.


Gallery of various videos from Grin, ranging from setup tutorials to product releases to random old presentations and footage from early projects.