Thread: Longer seat post and risers for a slightly too small frame? any problems with this.
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Old 02-04-12 | 12:55 AM
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noglider
aka Tom Reingold
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From: New York, NY, and High Falls, NY, USA

Bikes: 1962 Rudge Sports, 1971 Raleigh Super Course, 1971 Raleigh Pro Track, 1974 Raleigh International, 1975 Viscount Fixie, 1982 McLean, 1996 Lemond (Ti), 2002 Burley Zydeco tandem

Originally Posted by Bill Kapaun
There's about a dozen (or more?) different seat post diameters in .2MM (.008") increments!
You MUST get the proper diameter!!!!!

Rock Hoppers seat posts varied from year to year, so you can't assume they have a generic size for that model.
You MIGHT be able to find the proper diameter on bikepedia.com

I installed a 400MM post on my bike last summer for the same reason as you.
I found a NEW one for $30 on the net and the bike shop matched the price.
That's the preferred way to do it, but I've had success with shims. This has the advantage of lower likelihood of scratching the seatpost. An undersized seatpost with a properly-sized shim can leave the seatpost relatively unscratched.
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