Technical & Reference Section > Tech and Restoration

Seatpost/seatclamp diameter

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highrisedrifter:
Please forgive my ignorance but BITD, if i wanted a new seatpost or clamp, I went out and bought one and didn't worry about the diameter of the tube.

I know there are 22.2mm (7/8") clamps and 1 1/8" clamps too.

What bike fits what size clamp, please? Is it always the way that an OS bike will have a 22.2mm clamp, or did some manufactureres opt for a specific size for all their bikes?

This will really help me as I'm trying to build up three f&f at the moment (Master, Streetbeat and Pro Performer) and I can't find my bloody tape measure.  :D

Thanks

HRD

Moose:
Old school seatposts are 7/8" (22.2mm), the clamps are 1" (25.4mm).

Most new school seatposts are 1" (25.4mm) and the clamps are 1 1/8" (28.575mm)

I think that's about right  ???

highrisedrifter:
Great, thanks.

I hoped it was something like that.

HRD

thesku11s:
get yourself a vernier caliper, you wont regret it.

ones with a digital display only £10 on ebay

highrisedrifter:

--- Quote from: thesku11s on May 06, 2007, 07:54 PM ---get yourself a vernier caliper, you wont regret it.

ones with a digital display only £10 on ebay

--- End quote ---

I have absolutely no idea what one of those is.   :) I shall do some research.  :daumenhoch:

HRD

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