Shorter cranks for mountain biking: What are the real benefits and drawbacks of using shorter cranks, and is the current trend towards 165-170mm cranks for trail and enduro riding based on actual evidence or just a fad?
If shorter cranks are supposed to improve pedaling efficiency and reduce fatigue, why do so many professional mountain bikers still ride with 175mm cranks? Is it because the benefits of shorter cranks are only applicable to casual riders or certain types of terrain, or is it because the pros are simply too invested in their existing setup to make the switch?
What about the claim that shorter cranks reduce the risk of overuse injuries, such as knee pain and tendonitis? Is there any actual research to back this up, or is it just anecdotal evidence? And what about the potential drawbacks of shorter cranks, such as reduced leverage and power output?
Is the optimal crank length really dependent on the individual riders leg length, riding style, and terrain, or can a single standard length be applied across the board? And what role do other factors, such as saddle height, handlebar height, and shoe size, play in determining the ideal crank length?
Ultimately, what is the best way to determine the optimal crank length for a particular rider, and how can we separate the hype from the actual benefits of shorter cranks?