Originally Posted by
Maelochs
Your cadence is not dependent on crank length.
Originally Posted by
wphamilton
I'll also point out that changing the crank length has no impact on cadence other than psychologically. That's not to mean just you; the tendency for most people is to increase their cadence at first when they shorten the crank. Because the foot speed is less for a given rpm. So the "cadence fixing" guys didn't really help.
Cadence
can be affected by crank length. Shorter cranks mean less leg movement for each revolution, and also increase the amount of force required to turn a given cadence and a given power output, so with shorter cranks it can be natural to use a lower gear and a higher cadence to keep the foot speed and pedaling force similar.
That said, switching from a 175mm crank to a 172.5mm crank is only a 1.4% difference. Hardly anything.
If you
really want to boost that cadence, throw on a 130mm crank or something. Except, it would still be pointless. The whole purpose of pedaling a high cadence with low gears is to reduce the force that your legs need to push with. But if you're only reducing your gear choice to compensate for the force increase from the shorter cranks, you're back to where you started.