Measure & supply bolt circle of cranks ,,, how are they mounted? ...
An alternative Mixed hybrid, hub, Sturmey Archer combines Cassette & IGH
so like a triple crank with 1 chainring 2nd like what you have low .75 of 2nd, , high 1.33 x overdrive
wondering if anyone knows if there's a particular reason for having these sizes of chainring on the front
small wheel has to turn more frequently per mile, than the larger wheel does .. so smaller wheel bigger chainring..
Internal gear Cranks exist too so chainring can turn at a different rate than the pedals ..
But a bigger chain ring weighs less.. (55-44 is used on smaller wheel triathlon race bikes too)
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