Hub drive for bicycle speedometer

摘要

A speedometer drive for a bi/cycle or exercising/cycle that includes a circular plate rotatable with the front wheel having an annular array of apertures that drives an intermediate plastic idler gear and also axially positions the gear to eliminate the requirement for any thrust rings to position the gear. The intermediate idler gear drives a one-piece plastic out-put gear and coupler. The output gear has a flange that slidably engages a thrust surface on the intermediate idler gear to axial position the output gear so that the output gear does not require any thrust rings either.