Slave Posted June 9, 2009 Share Yep, as always, I'm confused again (Still) Some time back a fella rider said I should run 180 cranks for my height. Currently running 175's. What is a good rule of thumb for working out what crank length is best? Link to comment Share on other sites More sharing options...
Canaris Posted June 9, 2009 Share half your femur length. If you are a spinner shorter, if you grind big gears longer. Always be aware the longer it is the more stress on your knees (weak knees = shorter length). Link to comment Share on other sites More sharing options...
NotSoBigBen Posted June 9, 2009 Share Slave did it worry you before the 'fella' rider mentioned it? Link to comment Share on other sites More sharing options...
Slave Posted June 9, 2009 Share BB. not at the time, but now I have access to a spare crank set with shorter cranks (170mm) with 53 / 39 blades. What I'm scheming is to change my 52 blade to the 53 and rather keep the 42 than change to a 39 and possibly going to shorter cranks. Logic says that it will take more leg power to drive a shorter crank, but I should be able to go faster. (Based on the practice of pushing a merry go round as a kid, we got it to go faster by pushing in the middle.) Just an idea I'm playing around with. Link to comment Share on other sites More sharing options...
NotSoBigBen Posted June 9, 2009 Share OK I guess the other 'ekspets' will probably provide me the necessary kick to the gonads but here would be my take ..... Keep the 175's and put the 53 and 39 on your bike. You will only gain and not lose anything. I'm sure that others will comment on the exact gear ratio issues but that is what I would so - use it don't use it up to you I would say that 170 is too short for you! Link to comment Share on other sites More sharing options...
Gumpole Posted June 9, 2009 Share get the 'best' length for your leg length/ riding style.... then get the right gearing combinations for your riding style/ race conditions. BUT this will not increase your power which is physically impossible!!! ... therefore neither your speed, the merry go round had very little resistance - that is why you could push it faster! Link to comment Share on other sites More sharing options...
obree Posted June 9, 2009 Share Yep' date=' as always, I'm confused again (Still) Some time back a fella rider said I should run 180 cranks for my height. Currently running 175's. What is a good rule of thumb for working out what crank length is best? [/quote'] Check out Lenard Zinn's website www.zinncycles.com he knows a bit about taller people and cranks. If you are a fun rider, stick with what you have, If you are serious it makes sense to get the correct length crank for your leg length. Link to comment Share on other sites More sharing options...
Slave Posted June 9, 2009 Share Thanks BB. Since my trip into the SBR the other day, I am not keen on changing my 42 to a 39. (One kick in Gonads.) If anything, I find the change down from 52 to 42 to be too big as it is. Even running 11 / 22 at the back, 42 is a bit fast for me. (It was a bit of a gring going through SBR on that ratio, but I managed.) 39 will be even faster. My big problem is leg speed. Dem tings is super slow. Link to comment Share on other sites More sharing options...
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