>>1082790>>1082783>>1082779Forgive my bad wording. I did say "LIKE gearing up" not actually changing gear ratios
Sheldon Brown takes crank length into account with his personal "Gain Ratios" system:
https://www.sheldonbrown.com/gain.htmlHere's the tri site where I got my crank-length de-Zinning:
http://www.slowtwitch.com/Tech/Crank_Length_and_Gearing_4095.html> Many folks are unaware that your bike’s crank length has a significant effect on its overall gearing. > You may remember that ProTour cyclist and Armstrong arch-rival, Jan Ullrich, would ride a slightly longer crankarm length for mountain stages. The idea was simple: You get more mechanical advantage with a longer crankarm for a given gear. Another way to think about it is this: The gearing is lower with the longer arm, so it is easier to push. For a given set of chainrings and rear cogset, the bike’s top gear is higher. Likewise, the lowest gear in the cassette is slightly lower.> To quote Brown,> “What About Crank Length? All of these systems share a common inadequacy: none of them takes crank length into account! The fact is that a mountain bike with a 46/16 has the same gear as a road bike with a 53/19 only if they have the same length cranks. If the mountain bike has 175's and the road bike 170's, the gear on the mountain bike is really about 3% lower! 