The largest frame size is therefore about 25% larger than the smallest for each gender, and if we look at distributions of peoples heights then these sizes should cover at least 95% of both males and females. The selection of internal-gear hubs in the Calculator is complete except for one a few new models whose gear ratios have not been made public, and some very rare antiques. So, why do cranks offered on mens bikes only vary between 170 mm and 175 mm, a 3% difference, and on womens bikes between 165 mm and 172.5 mm, a 4.5% difference? I also moved my saddle back 12mm with some slight filing of the old seat post top clamp. Since approximately 2010, there has been a rash of new bolt-hole patterns with uneven spacings. None of these relate to pedaling comfort in average riding situations, so I would tend to ignore this trend (especially because the biggest bikes still have 175mm cranks as stock). Is there algorithm or formula that I could use to make the adjustments using 165mm cranks based of the Retul bike fit numbers? but there is currently confusion in the industry regarding how it is actually measured. Shimano spec, measured to the middle ring. Any crank that fits on one type of spindle will fit on all spindles of that type, but if the length is incorrect, the chainline/clearance will vary. e.g. Webcrank arm length calculator sheldon brown hypersensitivity vasculitis after covid vaccine urban sucking. Sheldon Browns gear calculator script allows you to calculate gearing ratios. And this difference feels a bit like headwind. And the big component makers should bring back 165 and 167.5mm road cranks at every price level. The crank may be bent. It originally was the diameter of the drive wheel of a high-wheel bicycle. The overwhelming majority of bicycles in current production. It can be measured only if the crank is installed on a bicycle and a straight pedal axle is installed. Formulas for computing crank length (in mm) from height, inseam measurement (in cm), and femur height (in cm, measured from the floor to the top of the femur bone) include: There is also a bicyclecranklength mini-blog and this page and this one are useful resources on the topic. Lennard Zinn reported that Pruitt warns that cranks that are too long can cause injuries because the compressive and shear forces in the knee joints go up exponentially due to the sharper knee bend. 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. If peoples heights, saddle heights, and bike frames vary by 25% then a variation in crank length of 3% may not be sufficient. An example of data being processed may be a unique identifier stored in a cookie.