Bicycle Mechanics - Seatpost size question
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10-01-05, 07:32 PM
I have a 1970 Peugeot PX10, the seatpost that is/was in there is a size 26.2, It can go in and out but there is a lot of difficulty, much more than on my newer bikes. I totally cleaned out inside the seat tube. When I took it out once, I twisted in one direction around and around and around until it finally came out and now the seatpost has some shallow swirls where the frame cut into the post a little bit. It seemed like a freak occurence because it hasn't done it since and there might have just been something loose in there. I'm wondering if maybe the correct size is 26.0 mm? Would a 26.2 seatpost even fit into the 26 sized frame in the first place?
A 26.2 wouldn't normally fit a 26.0. You can always use some sandpaper on the post and a cleanup of the seattube would be no foul either.
10-02-05, 02:52 PM
anyone else have any comments, would a 26.2 ever fit in a 26.0 seattube? I know sydney is probably right but I'm looking for some confirmation because I was told by someone else that it might work.
if tolerances were way off, a nominal 26.2 might fit into a 26.0 seattube. might also take a hammer to make it "fit". from what i know, most older high-end peugeots were 26.2 or 26.4.
It's fairly common to see that spiral scoring on snug seatposts. Most LBSs have a guage to measure the seat tube opening and tell you what size post should in there
10-02-05, 08:29 PM
.2 is too big of a difference. If this is a sloted seat tube, perhaps the slot needs spreading.
I think I saw on Sheldon's website that if you forced too large a seatpost in there, you'd halve some deformation of the seat tube, or you'd be checking his site on how to get that seatpost out, not talking about some scratches.
I agree with the sandpaper idea. Clean, sand, and clean again; then grease.
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