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Terror Stain
Joined: 05 Oct 2009
Posts: 30
Location: Essex
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 Posted Wed Nov 4, 2009 5:48 pm |
Evening all,
I've been scouring the net for a seatpost shim but not had any luck finding an off the shelf one in the size I require. I've got a Scott Genius MC-10 with its rather large seat post diameter of 34.9mm. I'm looking for a shim to take the size down to 29.4mm to fit my snazzy new seat post 
If there isn't one made in this size, has anyone had any experience of getting a "custom" one made by a local machine shop etc? I'm guessing it should be a fairly easy job. If anyone can recommend a place they have used I would appreciate the details and any idea on a rough cost. Also, what would be the best material to make the shim from, I'm guessing aluminium? If it makes a difference, my frame and new seatpost are both carbon (the current standard seatpost is aluminium).
Many thanks in advance for any help or advice!
Cheers 
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supersonicLives Here
Joined: 25 Nov 2005
Posts: 48031
Location: Chapeltown, Sheffield
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Terror Stain
Joined: 05 Oct 2009
Posts: 30
Location: Essex
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Posted Wed Nov 4, 2009 6:00 pm |
| supersonic wrote: | | So you have a 29.4mm new post, and require a 5mm shim for it? |
Yes......
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dave_hill
Joined: 16 Oct 2007
Posts: 3638
Location: Burnley, Lancs.
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Posted Wed Nov 4, 2009 6:50 pm |
Getting one made will probably be more expensive that buying a new seatpost that will fit the frame properly, or a shim of a more "normal" size an the seatpost to fit it.
USE only do a 34.9 to 31.4
Give a home to a retired Greyhound. Tia Greyhound Rescue
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Terror Stain
Joined: 05 Oct 2009
Posts: 30
Location: Essex
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Posted Wed Nov 4, 2009 7:21 pm |
| dave_hill wrote: | | USE only do a 34.9 to 31.4 |
Yeah I'd already found their site here, shame they don't do what I need 
I'm guessing that if I got their shim to take the diameter down to 31.4mm, I couldn't just use gaffa/electrical tape to "thicken" up my seatpost 2mm from 29.4mm to 31.4mm? I assume that someone would have suggested this if it was an option. Forgive my ignorance, but would this not work or would the seatpost keep slipping down and/or be dangerous?
Appologies if this is a really dumb suggestion, bear with me I am new to biking! 
Thanks for your help!
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supersonicLives Here
Joined: 25 Nov 2005
Posts: 48031
Location: Chapeltown, Sheffield
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dave_hill
Joined: 16 Oct 2007
Posts: 3638
Location: Burnley, Lancs.
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nicklouseLives Here
Joined: 20 Mar 2003
Posts: 48248
Location: A Yorkshire man in Sweden
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bomberesque
Joined: 18 Jul 2008
Posts: 1148
Location: Belgium, where rain is typical
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Posted Thu Nov 5, 2009 11:39 am |
| dave_hill wrote: | | USE only do a 34.9 to 31.4 |
any reason why you can't use that with a 31.4->29.4 shim inside it? they are top hatty shaped so they won't slip against each other. It's faff but maybe a cheap solution to your problem. My evil has a 34+ -> 31.6 ally shim factory fitted and I had a 31.6->27.2 shim fitted in that to take a grav dropper that I got cheap from a mate. Worked fine.
Everything in moderation ... except beer
Beer in moderation ... is a waste of beer
If riding an XC race bike is like touching the trail,
then riding a rigid singlespeed is like licking it
... or being punched by it, depending on the day |
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Terror Stain
Joined: 05 Oct 2009
Posts: 30
Location: Essex
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Posted Thu Nov 5, 2009 12:10 pm |
| bomberesque wrote: | | dave_hill wrote: | | USE only do a 34.9 to 31.4 |
any reason why you can't use that with a 31.4->29.4 shim inside it? they are top hatty shaped so they won't slip against each other. It's faff but maybe a cheap solution to your problem. |
I thought of that, but I can't find an off the shelf shim going 31.4 - 29.4
USE don't list one on their website. If I can get two shims to work then I'd be happy with that, like you say they are top hat so won't slip inside.
Thank you for your help!
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The Beginner
Joined: 30 Apr 2009
Posts: 470
Location: Leamington Spa
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Posted Thu Nov 5, 2009 12:47 pm |
Well cane creek will do you 21.4 to 27.2 but that don't help! Buying the right (or at least a useable with a shim) seatpost looks like your only solution I'm afraid.
Simon
FCN9 using a home built hybrid (believed to be a Carrera touring frame) also building an MTB from a Kraken frame. |
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bomberesque
Joined: 18 Jul 2008
Posts: 1148
Location: Belgium, where rain is typical
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Posted Thu Nov 5, 2009 2:11 pm |
hmm, a USE SX shim 32.2->27.2 or (maybe better) a USE thermoplastic 25.0 -> 30.0 would be the right thickness (2.5mm) for the job. Whether you could get it to open up enough to take the larger post I'm not sure but I rekon a bit of fettling would do it and wth it's only a fiver. not in stock mind but maybe you could find something that does the job....
Everything in moderation ... except beer
Beer in moderation ... is a waste of beer
If riding an XC race bike is like touching the trail,
then riding a rigid singlespeed is like licking it
... or being punched by it, depending on the day |
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Terror Stain
Joined: 05 Oct 2009
Posts: 30
Location: Essex
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Posted Thu Nov 5, 2009 5:04 pm |
| bomberesque wrote: | | hmm, a USE SX shim 32.2->27.2 or (maybe better) a USE thermoplastic 25.0 -> 30.0 would be the right thickness (2.5mm) for the job. Whether you could get it to open up enough to take the larger post I'm not sure but I rekon a bit of fettling would do it and wth it's only a fiver. not in stock mind but maybe you could find something that does the job.... |
Top man, sounds like a good idea!
I've just been searching and found this site:
http://www.dotbike.com/ProductsP1638.aspx?utm_source=internal&utm_medium=site&utm_campaign=DRV
I've ordered a thermoplastic 25 - 30.4 shim. For less than £6 delivered, its got to be worth a try. Maybe if I put it in hot water for a while it will soften up and be easier to open up. Like you say, I'm sure with a bit of fettling it can be persuaded to work 
I will report back once its arrived and I've had a go.
Thanks again for your help, much appreciated!
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