May be leave it off most of the time, ?? then the hub dynamo and current conversion pieces
like sinewave, makes,
for going from the hub output to a compatible output for USB,
to trickle charge the phone, can keep up.

generators for bikes have been 6v3w for decades, now they put out AC
so you need a rectifier and limiter circuit.. to go to USB standard.

yout tires will probably not have a utility casing ..
for the sidewall traction band for a bottle dynamo..




..