1. This site uses cookies. By continuing to use this site, you are agreeing to our use of cookies. Learn More.

Does 2.5mm make a difference?

Discussion in 'Bicycle Mechanics and Repairs' started by slow down, 28 Jul 2007.

  1. slow down

    slow down New Member

    Location:
    Walsall
    I'm thinking about switching my best bike to a compact, but I have a grey Centaur groupset and the only grey Centaur compact chainset I can find has 175mm cranks, where I normally ride 172.5mm. Does the 2.5mm really make any difference, or will I not notice?
    Or does anyone know where I could get a 172.5mm grey Centaur compact chainset from?
     
  2. Yorkshireman

    Yorkshireman New Member

    I've had the same thing on some of the bikes I've had in the past and I never noticed the difference (if that helps), though I could have adjusted the seat post and forgotten.
     
  3. Fab Foodie

    Fab Foodie hanging-on in quiet desperation ...

    Depends...
    I'm happy on 170 or 172.5 (apparently optimal length for me), but could not get-on at all with the 175's I had on my previous steed, was just 2.5mm too far.
     
  4. Steve Austin

    Steve Austin The Marmalade Kid

    Location:
    Mlehworld
    It can depend on how tall you are, allegedly.

    i've ridden 170 through to 180 and all have been fine. i did find spinning a 170 a tad tiring though.
    IIRC there is some site that has loads of measurements to see if certain size cranks will be ok for leg length.
     
  5. slow down

    slow down New Member

    Location:
    Walsall
    Cheers - I may give it a try. I can get the 175 chainset for £40 (just need to remember where I saw it :thumbsup:) so not that much of a gamble I guess.
     
  6. Elmer Fudd

    Elmer Fudd Miserable Old Bar Steward

  7. slow down

    slow down New Member

    Location:
    Walsall

    Mmmm - one recommends 170mm cranks, the other 181mm!
     
  8. Elmer Fudd

    Elmer Fudd Miserable Old Bar Steward

    Thats the thing though, I'm told for my inside leg I need 165mm, currently using 170mm but wishing I had 175mm !