Shorter cranks (e.g., 165mm) often allow for a higher pedaling cadence and are frequently preferred by triathletes [7]. Longer cranks provide more leverage but can reduce ground clearance during sharp turns [7].
For more technical walkthroughs, resources like the Park Tool Repair Blog provide detailed visuals for specific crank brands [14]. CrankHD
Crank lengths typically range from 165mm to 175mm [7]. A common rule of thumb is to choose a length that is roughly 41% of your tibia length (measured from the ankle bone to the knee joint) [5]. Shorter cranks (e