Looking to buy a new MTB crankset. I have always used 175mm I believe, either because they were what was provided on a stock bike or when I bought some they were what was in stock and it was what I was used to.
However, I have always used 170mm cranks on all my road bikes following a bike fit several years ago.
So should I stay with the 175mm or step down to 170mm. I am a XC jey-boy type so I don't think clearance is a big decider - Are there any other factors I should consider? Would one or the other be easier on my aging knees.