Considering the biomechanical implications of crank arm length on knee joint stress and tracking, can someone explain to me why the industry has largely dismissed 155mm cranks as a viable option for road cyclists, despite the fact that they may offer a more optimal Q-factor and reduced patellofemoral joint stress for riders with shorter legs or those who prefer a more upright riding position?
It seems counterintuitive that manufacturers would focus on producing cranks in the 165-175mm range, which may exacerbate issues with knee tracking and joint stress for certain riders, rather than exploring the potential benefits of shorter crank arms.
Furthermore, what role do factors such as rider weight, pedaling style, and bike fit play in determining the ideal crank arm length for minimizing knee joint stress and optimizing power output?
Are there any studies or research papers that have investigated the effects of crank arm length on knee joint stress and tracking in road cyclists, and if so, what were the findings?
Lastly, can anyone provide insight into why some manufacturers have started producing cranks with adjustable arm lengths, and whether this is a viable solution for riders who are unsure about their ideal crank arm length?