I have been running Truvativ Firex 170mm on my mountain bike for 5 years and I have a set of Shimano LX octalink 175mm cranks that I want to upgrade to. I am having trouble finding a set of 170mm cranks to swap with the shop. My inseam is about 31-32. I am 5 foot 8 inches tall. I weigh about 75kg. Would 175mm cranks be too long for me? I have heard people say that it will damage my knee and my legs.
I have a set of 175 Ultegras that I run on my road bike and they feel okay but my coach said that there will be long term damage if I run them too frequently. They do feel harder to pedal but I think that's just because of the gear ratio on double chainring cranks and the fact that I am running a 11-21 cassette. Is that really true?
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