Results 1 to 2 of 2
  1. #1
    mtbr member
    Join Date
    Feb 2004

    crank lenght: road avg 170mm, mountain avg 175mm. Why?

    Seems like the average mountain crank is 175mm and the average road crank is 170mm. Is that correct or am I just confused. If that is the case then WHY is that the case? I'm not trying to start a debate about which is better for who etc. I'm just wondering if there's some sort of historical fact that brought this about.

  2. #2
    mtbr member
    Reputation: GTscoob's Avatar
    Join Date
    Apr 2009
    Cadences are faster on the road and shorter cranks allow for better spin. Also ground clearance since road bikes sit lower to the ground, shorter cranks allow you to pedal through turns. Tight ratio cassettes make it easy to keep your cadence right in the sweet spot.

    Mountain bikes tend to involve some mashing up hills and slower cadences to larger cranks allow for a better torque advantage. Cassettes being wider spaced only add to this.

Similar Threads

  1. Swapping a 170mm crank for 175mm crank?
    By vegan_warrior in forum Drivetrain - shifters, derailleurs, cranks
    Replies: 9
    Last Post: 08-28-2012, 07:07 PM
  2. Difference in 170mm crank vs 175mm
    By Andrew8404 in forum Drivetrain - shifters, derailleurs, cranks
    Replies: 13
    Last Post: 02-23-2012, 12:23 PM
  3. 170mm or 175mm crank?
    By gingermullet in forum Drivetrain - shifters, derailleurs, cranks
    Replies: 8
    Last Post: 09-23-2011, 08:45 PM
  4. lets do physics - 170mm vs 175mm
    By jbourne84 in forum Drivetrain - shifters, derailleurs, cranks
    Replies: 7
    Last Post: 08-09-2011, 10:32 AM
  5. 3x9 175mm -> 2x9 170mm. Thoughts?
    By hken2 in forum Beginner's Corner
    Replies: 4
    Last Post: 04-15-2011, 08:27 PM

Members who have read this thread: 0

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts



VISIT US AT and the ConsumerReview Network are business units of Invenda Corporation

(C) Copyright 1996-2018. All Rights Reserved.