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Bicycle Mechanics Broken bottom bracket? Tacoed wheel? If you're having problems with your bicycle, or just need help fixing a flat, drop in here for the latest on bicycle mechanics & bicycle maintenance.

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Old 06-06-08, 05:06 PM   #1
bagster
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seat post problems

The seatpost on my '07 Coda Sport gradually disappears in to the seat tube no matter
how much I tighten the clamp. This clamp is the type that uses an O-ring. Would "post creep" be common for a suspension seatposts? Hope someone can help before I break out the spot welder.
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Old 06-07-08, 07:27 AM   #2
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suggestions:
Bring to LBS and let them figure it out, perhaps the seatpost is too small ect.
Replace clamp with one that has a bolt, not a QR
Get a clamp that fits around the seatpost and bolt it shut, keeping the one already on the seat tube. That will keep the seat post from slipping for sure.
If the seatpost is small your LBS may have a shim for it. You might be able to wrap some aluminized tape, used for heating ducts, around the seatpost.
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Old 06-07-08, 10:34 AM   #3
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Take to a bike shop and have them use carbon grease instead of normal grease. Make sure they clean out all the old stuff first.
Carbon grease has a whole bunch of little balls in it that expand when clamping pressure is induced. All these little balls actually increase surface area while reducing maximum needed clamping pressure.
My $.02

P.S. It can be used on anything, not necessarily carbon. Works well in stem/handlebar interfaces too.
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Old 06-07-08, 01:57 PM   #4
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Do you have a reflector with collar mounted on the seat post? If so, move it to just above the seat post clamp and tighted the reflector collar. The extra gripping from the reflector collar should be just enough to stop the slippage.
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