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  • Interesting idea.

    My unqualified thoughts:

    The motor would be spinning at 50% extra RPM compared to a 700c wheel, but it might appreciate because I don't think the hub motors enjoy low speed high torque. However, at high speeds you'll be running the thing at 50% greater RPM than the engineers had bargained for. No idea if that's a bad thing or not.

    You'll also need quite short spokes indeed if you get one of the larger hub motors, which I would avoid because of the risk of it bucking into massive wheelies. The rear wheel is not far behind your centre of mass.

  • You would generally program the motor for the wheel size.

    This is all AIUI and assuming the speed sensor is on the wheel / spokes, if you put a larger wheel on a motor programmed for a smaller wheel you will theoretically (I’ve not tried it!) go faster, because you’re slowing the time it takes to make one rotation by increasing the circumference..

    Conversely; If I put a motor programmed for 700c wheels on a 20” wheel I would expect it to go slower / hit the 16mph cap faster.

    I’m talking about mid drive too, no idea with regards to hub motors but I’ve seen lots of very small wheel with very large motors built into them

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