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Custom Cranks buy in Boulder
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Custom Cranks

Custom Cranks

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  • BrandCustom
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Custom Extra Long CranksGot long legs and can't seem to use all your power with standard 180mm (or shorter) crank arms? Order a set of Zinn custom extra long cranks and get that extra power you're looking for. It only makes sense that your cranks should be proportional to your legs, not a length designed for somebody a lot shorter than you! Our extra-long cranks are available with a maximum length of 220mm and are specifically beefed up for bigger riders. You won't believe the difference they make!

Custom Extra Short CranksOr, got short legs and have trouble getting your legs around with your standard 165mm or 170mm crank arms? Order a set of Zinn custom extra short cranks and get that extra comfort, efficiency and smooth spin you're looking for. It only makes sense that your cranks should be proportional to your legs, not a length designed for somebody a lot taller than you! Our extra-short cranks are available with a minimum length of 130mm. You won't believe the difference they make!Proportional Crank LengthNo other conclusion makes sense to me. Muscles and joints work most effectively when operating in a certain range of motion. Short riders should not be required to force their muscles through a greater range of motion than the person with an 80cm inseam riding a 172.5mm crank. And on the other end, 7-foot basketball players do not bend their legs any less when they jump than shorter players. So why should they use minimal knee bend and operate their muscles only through a tiny part of their range when they ride a bike?Your legs turning the cranks is what propels you along on your bike, it's your motor. Proper crank length is crucial to achieve maximum efficiency in your "motor". Therefore, crank length is one of the most important aspects of bike fit. It's not enough to just scale the frame geometry to fit a rider. Crank length must also be adjusted, and Zinn Cycles is one of the only manufacturers in the world that makes cranks outside of the standard 170 - 180mm range.
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