Seatpost/seatclamp diameter

[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. 

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]

get yourself a vernier caliper, you wont regret it.

ones with a digital display only £10 on ebay

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

HRD

[CD17]

This is a Vernier caliper, but don't get a digital one, cos when you go to use it, the battery has gone 

[highrisedrifter]

Ah ok.

Thanks mate.

HRD

[Moose]

This is a Vernier caliper, but don't get a digital one, cos when you go to use it, the battery has gone 

That picture came in handy afterall