Milkman Posted March 28, 2015 Share I have 2 mtb's. One came with a 170 and the other with a 175 mm crank. On open roads or drags there is no dif , but I can feel a difference when it gets to tight turn accelerations , power climbs and switchback climbs. The 170 mm crank is much easier to power from slow speed , or when you need quick power. Is it such a big difference to warrant replacing the 175 mm cranks - no ! But if I had to buy a new bike or crankset , I would rather go for 170 mm cranks if I had the option. Link to comment Share on other sites More sharing options...
JohanC Posted March 28, 2015 Share I'm 1.68m and ride 170mm crank. Link to comment Share on other sites More sharing options...
Stig Posted March 28, 2015 Share You need torque on MTB 175.170 for speed low torque fine for roadies. Link to comment Share on other sites More sharing options...
pk007za Posted June 27, 2018 Share https://www.fit4bike.com/en/academy/tutorials/crank-length-myth Link to comment Share on other sites More sharing options...
Grey Hubs Posted June 27, 2018 Share Not sure if anyone has mentioned this, but I use 170mm cranks for less rock strikes on the trail...5mm can make a difference if you have a relatively small frame and lower BB. At 169cm, I'm a short ass...170mm works well. Link to comment Share on other sites More sharing options...
pk007za Posted June 27, 2018 Share 100% agree with you, I'm 184cm and the 5mm difference has been noticeable since i switched about a year ago - very few rock strikes now. My primary reason for moving was kneed joint pain, and i have 175mm cranks on my trainer bike, that end up hurting my knee, and 170mm on my trail bike that I can happily do 5 hour rides on without issue. Just lack of 170mm cranksets at the moment or people wanting stupid prices on the hub and I would have had a new set on the trainer bike. Link to comment Share on other sites More sharing options...
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