Kins
Über Member
- Location
- Ystradgynlais, S. Wales
I understadn it is related to spin rate. IIRC you can spin a shorter length crank faster so going up hill should be easier, if you can spin it all the way that is. - though it could be the opposite way around, can't really remember!
They use longer on mountains/hilly stages and shorter on flat on the tour if I read the article correctly.