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Look at my modified Cross Core drivetrain.

The square taper crank on our bikes is really several decades old technology. The spindle self is integral to the motor, it looks to have motor gear specific interface. It’s unlikely that you can use anything but another square taper crank arm and even then it probably has to be ebike specific...

lol, yeah! By 0.1! At the same 90 rpm rate that’s climbing 0.3 mph faster.

Actually, the Wabash gear spread is almost the same as the range of Yamaha bikes I tested. The cross core Gain ratio goes from 2.3 - 9.2, the Wabash is 2.3 - 8.9 and the civante is 2.2 - 9.2. So as you can see not really all that different. If using 90 RPM as a constant, that’s a difference of...