seat post shims?

[Zinger]

So I have, apparently, an odd-sized seat post diameter -- 30 mm. Not 30.2, not 30.8 or 30.9, an even 30.0.

And I want to run a Thomson layback post, which of course doesn't come in that size.

But I see there are shims you can buy to put, say, a 27.2 seat post in a 30.0 frame. (And I have so far been unable to find a 30.0 layback or setback post.)

Anybody ever used one of those things? Do they stay in place (as in, can you get it tight enough not to slip)? Thoughts??

ed

[MyOtherBrotherL]

I use a Shim or insert for both my Multi and SS Independent Fabby's. This way I can run a standard seat post. (And I also run a laid back seat post on the Multi). As far as slippage - My seat post (For some reason) slips on the Multi IF with and without the shim.

[mscard]

I've used a shim on my FS rig for the last 4 years and have never had a problem.

[rciracing]

You can also make a shim w/ a plastic 2 liter bottle of soda or a can too. Although real shims are not too expensive to begin w/. I've used plastic w/out any slipping.

[Trailcreep]

a 35mm plastic film canister works great, just cut the bottom off and split the side, you'll probably need to trim it to fit your frame....the great thing about the film can is that it has a small lip that keeps it from slipping into the frame




You can also make a shim w/ a plastic 2 liter bottle of soda or a can too. Although real shims are not too expensive to begin w/. I've used plastic w/out any slipping.

[oldskoolbiker]

I used one for a short time until I got the right size post. I never had any problems. I had the cane creek one and it was really long which probably helped prevent slipping. You can get it off performancebike.com for $7.99 and they'll ship to the local performance shop for free. I doubt they'll have them in stock at the performance but you could try calling them before ordering online.

http://www.performancebike.com/shop/Profile.cfm?SKU=6315&item=50-0628&slitrk=search&slisearch=true

[brian_brox]

Not that you really need another "shims are okay" post, but the alloy Giant XTC frames came with a shim that was designed to bring the post down to 27.2 from a commonly available size (30.9 i think). When asked, Giant insisted that the shim should be used rather than buying the larger seatpost.

[mark w]

The shimmed Giant bikes were using a very uncommon 30.8 seatpost ream. Or at least that is what the VT1 I had was.

[BikerMiker]

Larry, if your seatpost is slipping you probably don't have it tight enough or the wrong size seatpost...

Don't use plastic shims. Scary. I'd use beercans before plastic.

mk

[camp]

a 35mm plastic film canister ...Ahh, so that's what film canisters are for.

I use a shim on my IF, so that I also can use a Thomson Layback

[walsh]

Ahh, so that's what film canisters are for.

Don't do it - it's a dead giveaway to DEA officers that you're keeping your stash in your seatpost.

[nocro]

So I have, apparently, an odd-sized seat post diameter -- 30 mm. Not 30.2, not 30.8 or 30.9, an even 30.0.

And I want to run a Thomson layback post, which of course doesn't come in that size.

But I see there are shims you can buy to put, say, a 27.2 seat post in a 30.0 frame. (And I have so far been unable to find a 30.0 layback or setback post.)

Anybody ever used one of those things? Do they stay in place (as in, can you get it tight enough not to slip)? Thoughts??

ed


Did you read Zen and the Art of Motorcycle Maintenance? Beer can.