Ebike parts tend to be lag the standards used in the modern bike industry by several years but we do our best to move things forwards. Recently the 650b aka 27.5" wheel size has largely replaced 26" as the standard for new mountain bikes, but hub motors in 650b rims have been nearly impossible to find. 

650b Rim Size Compared650b Rim Options in Hub Motor BuildsExample of 650b eZee Kit Motor

We've addressed this and now have our front and rear eZee kits available in a prebuilt 27.5" option with a Schwalbe Big Ben tire. We also have stock of both Alex DM24 and and Velocity Cliffhanger rims. We can now offer a 27.5" size for the 9C+ kits, Bafang G01 kits, TDCM IGH kits, and other custom wheel builds. This addition will ensure that Grin has a drop-in hub motor option for all the newer bikes out there.