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Bicycle Mechanics Broken bottom bracket? Tacoed wheel? If you're having problems with your bicycle, or just need help fixing a flat, drop in here for the latest on bicycle mechanics & bicycle maintenance.

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Old 01-17-08, 08:16 AM   #1
Ryleeryno
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Seatpost collar question.

I need to replace the seatpost collar on my 2005 Trek which has a 27.2mm seatpost and I don't know what size collar to get. Do the collar sizes reflect on the outer diamater of the seatpost or the clamping area of the post instead?

For instance. I'm getting a Felt F3c frame which utilizes a 27.2mm seatpost also. Are the collars interchangable or are they frame specific?

Any advice would be appreciated. Thanks.
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Old 01-17-08, 11:27 AM   #2
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You need to measure the outside diameter of the seat tube where the collar (or clamp) sits. There are several different sizes. The two most common sizes these days are 1 1/4" (31.8mm) and 1 3/8" (35mm).

The seatpost size has nothing to do with seatpost clamp size.
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