stewie911 Posted November 26, 2009 Share How do I know which size to get? 165mm, 170mm etc. I have a 18" mtb frame and I am 1.69m, so about a 17" is my perfect size. Link to comment Share on other sites More sharing options...
no calves Posted November 26, 2009 Share 170mm Link to comment Share on other sites More sharing options...
Sterad Posted November 27, 2009 Share Go with that. 170mm Link to comment Share on other sites More sharing options...
JPW# Posted November 28, 2009 Share 170s are for the track. I wish 180s were easier to come by. Link to comment Share on other sites More sharing options...
stewie911 Posted November 28, 2009 Share Why different sizes? Is it for better rider fit, or is it a torque thing. Link to comment Share on other sites More sharing options...
GoLefty!! Posted November 29, 2009 Share your height does not help with a recommendation for a crank length. Measure the length of you femur please and repost. Eg, I am 171cm, 39.7cm Length femur translates into a 175mm crank road and MTB. You could be either 170mm or 175mm depending on your femur length. Link to comment Share on other sites More sharing options...
Ha Ha Kieran Posted November 29, 2009 Share What is the relationship between femur length and crank length Lefty? Is there a ratio or something? Link to comment Share on other sites More sharing options...
GoLefty!! Posted November 29, 2009 Share there is no real ratio althought here is a good article on the various models in use today. all are flawed. http://www.cyclefitcentre.com/pdf%20final%20docs/CRANK%20LENGTH%20ARTICLE%206_final.pdf Cranke length is dependant on the femur length of the rider, the seat tube angle, the riders foot size and the saddle height. With those dimentions it is possible to achieve a suitable crank length from first principals. what i would say is that unless a rider is less than 160cm tall, or has unusually short legs a 170mm or 175mm is probably going to fullfill the requirement. Link to comment Share on other sites More sharing options...
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