35 mm = 1.378". I replaced Cinelli criterium bars with cow horn type, and now find I need to reduce the reach forward stem with adapter for steel frame and an adjustable stem to get bars 50mm higher, and 50mm back from where they used to be. There is certainly some evidence that ultracyclists should generally use shorter cranks than they are currently using if they want to have the best chance of avoiding knee problems. This means that people using shorter cranks are better off with lower gearing that allows them to use a higher cadence when traveling at the same speed as someone with longer cranks. Just 30% of males are catered for appropriately. Why not? Calculate How to Use the Crank Length Calculator 1) Measure your inseam (barefoot from the ground to the top of your crotch) How to Measure Inseam for the crank length calculator 2) For any distance bike riding like road, gravel, touring, XC MTB, etc the calculator should give you an exact length. Therefore, you need a larger chainring. If your saddle height is less than 65cm you will definitely need cranks shorter than 165 (to open the min knee and hip angles). I will stick with longer cranks on my road bike as that position doesnt seem to promote as acute angles. cranks (most Japanese models) may bottom out if installed on ISO spindles. document.write(document.lastModified) Rollout. The wider ridges of an Octalink V2 spindle You sometimes see 56cm I learned this the hard way when I bought a used mountain bike that came with 180 mm cranks. Truvativ International. You can calculate gain ratios, gear inches or meters development with my, A road bike with 170 mm cranks: (The usual generic diameter value for road wheels is 680 mm, so the radius would be 340 mm. The Ratio of distance the end of the crank arm travels to the distance the wheel travels by taking into account the length of the crank arm. (Check that it doesn't wobble as the pedal is threaded in.). For females, cranks of at least 170 mm are only appropriate for the tallest 10%. Shell is slightly larger, thread pitch slightly finer. The most common lengths are 170, 172.5 and 175 mm, but it is possible to find cranks between 165 and 180 mm in the market. After all, we all use the same staircases, whether we have long or short legs.