For reasons that are not completely clear, many recumbent riders benefit from shorter-than-usual cranks. Da Vinci makes aluminum cranks in 120-200 mm lengths and Lennard Zinns aluminum cranks are offered in 130-220 mm. how much is murr from impractical jokers worth; fanatics cowboys jersey; what kinds of news are most important to you There are some specific characteristics of long-distance and ultra-cycling that suggests that cranks lengths shorter than suggested by the above equations could be more appropriate. Post #2 of 21 (5613 views) a shorter crank arm length will help prevent your knees coming into your chest in the aero position, which is usually the limiting factor. The chainring-to-interface measurement is 16mm. 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. The range of heights that are accommodated by these cranks are also shown shaded in light orange, and this should accommodate taller males except for the upper 2% (over 1.93 m or 64). The lowest gear on most mountain bikes is around 22-26 inches. A super-light carbon option is made by Lightning in 160-190mm lengths.