Chalo said:donn said:What are the odds that the Xiongda 2-speed is really intended for use with normal wheels, like 26" to 700C/29" ? It's a parameter I have wondered about - manufacturers are usually silent on the subject of the internal gear ratio, am I right?
Reduction gear ratios are usually 1:5 or close to it. Manufacturers can and do make different windings with higher or lower kV for different size wheels, but I know of none who make different gear reductions in the same hub for different wheels. For this reason, such hubs make the same maximum torque regardless of winding, and the same torque at a given heat load regardless of winding. So in a larger wheel, you get less push and more heating.
To get equal performance from a bigger wheel, you need a bigger hub.
So - not to put too fine a point on it, but everyone making hubs for bicycle wheels, essentially is making them for more or less the same size of wheel. Wonder what size of wheel that is?