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Cylindrical Cranks?(2 posts)

Cylindrical Cranks?Spiderman
Nov 5, 2003 8:41 AM
If a round tube is the most torsionally rigid, how come crank manufacturers dont produce cylindrical cranks (some have in the past but nothing really came into current mainstream)

I am thinking that for it to be stiffer than what we are using now they would have to be pretty round, hugely increasing Q factor to the point where it isn't feasible

I am not really sure, anyone know or have any thoughts?
Cylindrical Cranks = it's old newsalansutton
Nov 5, 2003 9:16 AM
Modern crank design optimizes the strength at the arm/spider interface. This is often the failure point and the location of the most flex. Yet some BMX and downhill crank arms are tubular for strength, but Q factor and weight are the biggest drawbacks to this design.