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Singlespeed & Fixed Gear "I still feel that variable gears are only for people over forty-five. Isn't it better to triumph by the strength of your muscles than by the artifice of a derailer? We are getting soft...As for me, give me a fixed gear!"-- Henri Desgrange (31 January 1865 - 16 August 1940)

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Old 01-31-07, 12:53 AM   #1
deathhare
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Big pipe..little hole

Sounds like fun but maybe not. 26.8 seat post in a 27.2 hole.
Will it work or do i HAVE to have a shim?
Thanks
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Old 01-31-07, 12:54 AM   #2
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sounds like you got it backwards

have you tried sticking it in yet?

do you have reason for no shim?
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Old 01-31-07, 12:55 AM   #3
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shim or get the right post.

You will compress or ovalized the seat tube trying to keep the 26.8 in there tight.
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Old 01-31-07, 01:09 AM   #4
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Thanks for the comments. Normally id get a new post. The seat post is a Sugino Mighty NJS post so i really wanna be able to use this thing. I looked for a shim yesterday and couldnt find one. Ill look more.
thanks
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Old 01-31-07, 03:22 AM   #5
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yea, you'll end up hurting the frame. Unfortunately the only shim's I've seen for that combo are "cone" types with a lot of excess shim popping over the seat tube, but then again, I haven't looked super hard.
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Old 01-31-07, 03:32 AM   #6
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Soda can? I *think* it should work, shouldn't it? Untidy but better than pinching the frame together.
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Old 01-31-07, 06:43 AM   #7
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personally, i wouldn't risk messing up my frame or having an unstable seatpost interface just to have the right stylish seatpost in there.
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Old 01-31-07, 06:47 AM   #8
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Sell it to the poor bastard who has a nearly complete NJS setup and just needs that 26.8 post. Then buy a Kalloy and a pound of weed.
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Old 01-31-07, 07:08 AM   #9
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Quote:
Originally Posted by Aeroplane
Sell it to the poor bastard who has a nearly complete NJS setup and just needs that 26.8 post. Then buy a Kalloy and a pound of weed.


cheap seatpost that fits > grand mighty seatpost with shim > ****ed up frame
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Old 01-31-07, 08:58 AM   #10
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Quote:
Originally Posted by Aeroplane
Sell it to the poor bastard who has a nearly complete NJS setup and just needs that 26.8 post. Then buy a Kalloy and a pound of weed.
lollerskates.
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Old 01-31-07, 08:59 AM   #11
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Quote:
Originally Posted by dirtyphotons


cheap seatpost that fits > grand mighty seatpost with shim > ****ed up frame
Yeah maybe i should sell. Any idea what i should ask for it? I dont think they make these anymore.
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Old 01-31-07, 09:02 AM   #12
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Judicious cutting of a beer can ought to work, has for me for years in the past.
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Old 01-31-07, 09:04 AM   #13
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Quote:
Originally Posted by jfmckenna
Judicious cutting of a beer can ought to work, has for me for years in the past.
Yeah i think ill try that and see how it feels. If its not tight enough before tightening the clamp then ill ditch the NJS crap and get some proper chinese 10 dolla post. CJS?
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Old 01-31-07, 09:06 AM   #14
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It WILL slip no matter how much you crank it and this can possibly damage the frame so do not do it.
I probably have a post I can sell cheap or trade if you want
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Old 01-31-07, 09:13 AM   #15
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where is the proof that a shimmed seatpost will screw up your frame?

Yes - get the right thing the first time, but if deathhare wants to keep the seatpost, a shim might work. I have seen a good number of bikes with seatpost shims (the USE Alien suspension posts required one for certainm size frames) without any ill effects.
http://images.google.com/images?svnu...=seatpost+shim
the hard part on this request is finding a 26.8 to 27.2 shim...
biketoolsetc and loosescrews have nothing in that range and it appears to be fairly uncommon.
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Old 01-31-07, 09:17 AM   #16
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Thanks, yeah i checked two shops today and they said a shim that thin doesnt exist. Maybe so cause
.4mm is pretty damn thin. That would mean the walls of the shim would need to be .2mm....thinner than butter.
Maybe ill give the ole Asahi shim a try.
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Old 01-31-07, 09:43 AM   #17
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That's what she said
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Old 01-31-07, 09:47 AM   #18
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no one makes a shim this close for seatposts..
you need a shim .2mm thick (it's a circle, remember)

you can try a can.. or even buy some shim stock, but then you'd be spending money you might as well spend on the right post

whatever you do, don't overtighten the binder if your post is slipping.. that's how seatlugs get cracked all the time
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Old 01-31-07, 10:06 AM   #19
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Quote:
Originally Posted by [165]
where is the proof that a shimmed seatpost will screw up your frame?
dunno if you were referring to my comment:

cheap seatpost that fits > grand mighty seatpost with shim > ****ed up frame

but i was referring to his question:
Quote:
Originally Posted by deathhare
Sounds like fun but maybe not. 26.8 seat post in a 27.2 hole.
Will it work or do i HAVE to have a shim?
i was posing my opinion that using the right seatpost is best. second best would be using a shim (which will work, but imho is less than ideal.)

the worst idea would be to clamp a 27.2 clamp onto a 26.8 post with no shim. not only does it deform your seat tube, but it puts uneven pressure on your seatpost, causing you to have to torque it down even harder to keep it from slipping. i've cracked a seatpost and stripped an internal seatpost binder bolt this way, but of course, your results may vary.

with a shim there is less contact area and unless it's cut PERFECTLY it will probably scratch your seat tube. i still believe that a cheap seatpost that fits would be superior to a nice post with a shim. but a shim is better than a ****ed up frame. that's all i was saying.
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Old 01-31-07, 10:44 AM   #20
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it's all good

I am 100% of the school of getting the right thing first. But sometimes there are ways to correct things without replacing them, and if this is done incorrectly, problems are imminent
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Old 01-31-07, 10:47 AM   #21
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> means greater than, not leads to. i read it the way photons intended.

nitto makes handlebar shims for putting 25.4 bars in a 26.0 stem. super thin, i think you might be able to find it.

of course, for the amount of money you payed for the frame, i would also find a proper seat post for it. trade or sell yours and buy a new seat post in the right size, njs approved if you MUST have that.
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Old 01-31-07, 11:57 AM   #22
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I would be worried about there being a few different metals touching each other. Ones going to expand at a different rate than the others leaving you with a stuck seat post.
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Old 01-31-07, 12:02 PM   #23
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That's what she said
somebody just had to, didn't they? i think it's standard forum protocol.

thank god this thread isn't in the roadie forum...
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Old 01-31-07, 01:26 PM   #24
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Yo, shim it with a can!
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Old 01-31-07, 02:53 PM   #25
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Quote:
Originally Posted by ryand
> means greater than, not leads to. i read it the way photons intended.
i was understanding that when I posted - thanks
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