Shimano Chainring PCD

fto-si
fto-si Posts: 402
edited April 2008 in Workshop
Can someone please confirm to me what the PCD is on a Shimano chainring? I am unsure how to measure this on my chainring.
If it makes any difference the chain ring is needed for a bike running 9sp.
Thanks
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Comments

  • John.T
    John.T Posts: 3,698
    Standard Shimano rings are 130mm PCD. Campag are 135mm. All compact are 110mm.
    My Fleet.
  • fto-si
    fto-si Posts: 402
    Thanks for the speedy response, so where do you actually take the measurement from?
    exercise.png
  • John.T
    John.T Posts: 3,698
    It is the Pitch Circle Diameter. That is the diameter of a circle through the bolt holes centres. If the ring is non Shimano or Campag it will often be stamped on the ring. The easiest way to measure is to measure from the crank centre (BB) to the bolt hole centre and double it.
    My Fleet.
  • maddog 2
    maddog 2 Posts: 8,114
    see http://www.sheldonbrown.com/gloss_bo-z.html
    Facts are meaningless, you can use facts to prove anything that's remotely true! - Homer
  • fto-si
    fto-si Posts: 402
    Thanks MadDog , thats got all the info i need
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  • redvee
    redvee Posts: 11,922
    104mm on 4 arm MTB chainsets and 130 on Road Chainsets
    I've added a signature to prove it is still possible.
  • fto-si
    fto-si Posts: 402
    redvee wrote:
    104mm on 4 arm MTB chainsets and 130 on Road Chainsets

    Not all road chainsets are 130 tho
    exercise.png
  • redddraggon
    redddraggon Posts: 10,862
    fto-si wrote:
    redvee wrote:
    104mm on 4 arm MTB chainsets and 130 on Road Chainsets

    Not all road chainsets are 130 tho

    We all should know the "proper" standard road chainsets are 135mm.....
    I like bikes...

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