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PVC Seatpost shim? What?!

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PVC Seatpost shim? What?!

Old 06-12-05, 03:06 PM
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rykoala
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PVC Seatpost shim? What?!

I got a free bike yesterday off of freecycle.org and it is an old school Schwinn MTB. Thumb shifters, 18 speed, freewheel etc. Cool old bike, needs lots of work. Anyway I took the seatpost out and noticed that the seatpost is WAY too small for the frame, and that its shimmed with a PVC lookin' shim, and its not even the full length of the seatpost. Its about 3" long at most. Is this rediculous or what. It looks like stock equipment!

Anybody ever seen one of these atrocities before?
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Old 06-12-05, 03:13 PM
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Most shims are only 2"-3" long, they are not the entire length of the post. Is it pvc or a resin? I've only seen aluminum shims. If its oem(original equipment from manufacturer) I would like to assume its safe, if its not oem, I would be leary. Take it to your LBS when in doubt.
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Old 06-12-05, 03:37 PM
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how much of a difference in size is there? I use aluminum foil myeslf
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Old 06-12-05, 03:46 PM
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The difference in size is huge. I'll have to get a pic of it when I get home (I'm at work now, whaaaaaa). I'd say its a good 1/4" or so of play. The thing is huge. I'm not concerned about it, as this bike isn't going to be ridden anyway, its a parts bike for my old Trek 820 that I'm building up. I'd make it a singlespeed but its got vertical dropouts. Oh well.
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Old 06-12-05, 04:23 PM
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Originally Posted by rykoala
I'd make it a singlespeed but its got vertical dropouts. Oh well.
Dropout type is not critical for SS's as you can always run a tensioner to take up the slack....
Horizontal dropouts are always ideal for fixed gear.
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Old 06-12-05, 04:42 PM
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Yeah, I know. I hate tensioners though. We'll see how it goes. I have to get this other Trek built up first, and I may end up turning this into a single speed yet. There's always half links and I could always put the freewheel on from my fixed gear, I don't think I'll be using it any time soon LOL.
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