seat clamp size

foy
foy Posts: 296
edited September 2014 in MTB workshop & tech
I need a new seat clamp for my seat post which is 31.6mm diameter, there is no diameter stamped on the seat clamp, can anyone tell me what diameter i need please.

Comments

  • Giraffoto
    Giraffoto Posts: 2,078
    Are you lucky enough to own a vernier caliper, or have a friend who has one? If you've taken the old one off, looked all over it and can't find the size stamped on it anywhere, that's your best option. A final possibility, if your seat tube is truly tubular and your front derailleur is clamped on, is to have a look at the front derailleur and see if it has the size written on it somewhere
    Specialized Roubaix Elite 2015
    XM-057 rigid 29er
  • Chunkers1980
    Chunkers1980 Posts: 8,035
    Or use some cotton and do some maths
  • Ouija
    Ouija Posts: 1,386
    Typically, a 31.6 post takes a 34.9mm clamp unless your frames made of some funky material.
  • jimothy78
    jimothy78 Posts: 1,407
    There's an easy rule of thumb to avoid doing maths (at least, for the 3 most common sizes):

    Measure around the seat tube of the frame using a fabric tape measure or cotton and a ruler as suggested above.

    11cm circumference = 34.9mm clamp
    10cm circumference = 31.8mm clamp
    9cm circumference = 28.6mm clamp

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