I have done a bit of reading on use of correct crank length recently including this article here
(yes – from a triathlon magazine!!) Which got me reading a bunch of other articles all over the internet.
After some measuring and thinking I have decided to try riding on some 170mm cranks on my mountain bike to see how it goes. I have been riding on 175mm cranks since I began mountain biking over 20 years ago and so it will be interesting to see whether I notice much of a difference or not. I am about 175 cm tall, but have long legs for my height.
I have been riding on Shimano XT (m760’s) for the last few years, but I picked up a set of Shimano Deore cranks in 170mm for cheap so I could try out the new length. If the shorter cranks feel good I will probably pick up a pair of the newer Shimano XT (m770’s) cranks in 170 mm.
I will report back with how I find the shorter cranks in due course. If the articles are correct it could do good things??