In a message dated 12/14/2007 2:21:38 PM Pacific Standard Time, classicrendezvous-request@bikelist.org writes:
Hi everyone,
>
> I have a Pogliaghi track bike with a seatpost that keeps slipping. I
> always thought it was 26.8 but recently this issue has me questioning
> that maybe it's 27.0. For all you Pog owners: what's your clamp
> diameter? Hopefully with this survey, I can figure this out. Thanks
> Classic Rendezvousers!
>
> Justin
Justin - Someone mentioned his was 27.2, but if it is a larger frame or one specifically built as a Sprint frame, it may have been made from Columbus PS tubing which had a thicker seat tube which takes 27.0. If you can get a long 26.6 or 26.8 post and wiggle it around in the seat tube to gently stretch the seat clamp area, you might open it up enough to fit a 27 or 27.2. Do this before using a reamer (your LBS should have one) so as not to take away any more material than necessary. Finish with a flex hone (from a good tool or auto parts store) in a drill to polish the burrs off so you don't scratch the larger post going in and out. I've resized a couple of older British frames lately that started out at about 26.2 and ended up 26.8 or 27.0. The reamer kept finding air below the seat clamp area so I just kept enlarging until it seemed cylindrical. Now the right size post slips right in and the ears of the seat lug don't bend together when I tighten up the bolt.
Bob Freeman Elliott Bay Bicycles 2116 Western Ave Seattle, WA 98121 206-441-8144 Home of Davidson Handbuilt Bicycles
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