Originally Posted by
2manybikes
It's not just perceived, the crank turns the cog a different amount depending on the size of the ring and the cog. This is how bicycles have gear ratios. Also called gear inches.
Totally agree but crank arm length doesn't factor into gear inches, recognizing that you didn't imply that
.
Sheldon incorporates crank lengths into his 'gain ratio' calculator but I'm currently obsessed with cranks due to complications from knee surgery. I'll never turn 175mm cranks again and even 165 - 170s are uncomfortable.
Sorry to derail thread.