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Creeping seatpost
Over the course of an hour' ride my seatpost will get pounded into
the frame. This is a stock Trek 7200 hybrid and I'm reluctant to tighten the [nylon?] clamp any more. (Yes, I'm a large rider.) The problem will only get worse over time. I'm considering green Loktite. Will that work? Anyone have a better suggestion? -- Jack Myers / Westminster, California, USA Our policy is, when in doubt, do the right thing. -- Roy L. Ash, ex-president, Litton Industries |
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#2
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Creeping seatpost
Jack Myers wrote:
Over the course of an hour' ride my seatpost will get pounded into the frame. This is a stock Trek 7200 hybrid and I'm reluctant to tighten the [nylon?] clamp any more. (Yes, I'm a large rider.) The problem will only get worse over time. I'm considering green Loktite. Will that work? Anyone have a better suggestion? Lots of things you can do. Assuming the post is correct (accurate) size, you can try a little plumber's tape or other "shim type" fix; or use a clamp of sorts above the insertion point to help keep the post from sliding down. (Plastic blinky holder or a full on hose clamp, for examples.) The OE clamp shouldn't be nylon, I wouldn't think. Mine are all metal and I tend to over-tighten stuff; haven't had a problem yet. Loktite might work, but I'd worry about it causing a "frozen" post. Others may have experience with it though... If it's really sliding all the way into the frame on rides, then I'd say your post is undersized. Visit a bike shop to measure, maybe? Good luck. Bill S. |
#3
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Creeping seatpost
On Mar 3, 8:44*pm, "Jack Myers" wrote:
Over the course of an hour' ride my seatpost will get pounded into the frame. This is a stock Trek 7200 hybrid and I'm reluctant to tighten the [nylon?] clamp any more. (Yes, I'm a large rider.) The problem will only get worse over time. I'm considering green Loktite. Will that work? Anyone have a better suggestion? Clamp it harder--it's aluminum and steel with possibly a nylon cam. If it still slips, get a proper hex-key collar (you can sometimes convert a QR model to keyed), grease the threads and tighten with a torque wrench to the specifications. The Salsa Lip-Lock is a nice strong model and pretty commonly available at bike shops. |
#4
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Creeping seatpost
Jobst Brandt wrote:
Bill Sornson wrote: Over the course of an hour' ride my seatpost will get pounded into the frame. This is a stock Trek 7200 hybrid and I'm reluctant to tighten the [nylon?] clamp any more. (Yes, I'm a large rider.) The problem will only get worse over time. I'm considering green Loctite. Will that work? Anyone have a better suggestion? Lots of things you can do. Assuming the post is correct (accurate) size, you can try a little plumber's tape or other "shim type" fix; or use a clamp of sorts above the insertion point to help keep the post from sliding down. (Plastic blinky holder or a full on hose clamp, for examples.) The OE clamp shouldn't be nylon, I wouldn't think. Mine are all metal and I tend to over-tighten stuff; haven't had a problem yet. Loctite might work, but I'd worry about it causing a "frozen" post. Others may have experience with it though... If it's really sliding all the way into the frame on rides, then I'd say your post is undersized. Visit a bike shop to measure, maybe? Well, plumbers tape (ain't tape) is thick steel. Geez, Jobst, for a humorless pedant you sure are funny sometimes. A) It's plumber's tape with an apostrophe. B) The common variety sold in Home Despot and every other hardware store is thin, teflon wrapping, not "thick steel" /strapping/. Very first Google hit: http://www.wisegeek.com/what-is-plumbers-tape.htm I'd try a section out of a soda-pop can or beer can. They are easily cut with household scissors into a one inch wide band, and see if that can be made to fit. One full wrap or even more should do the job if it really is an undersized post that it seems to be. Use grease for final tightening to prevent future water intrusion. Jobst Brandt Since it's sliding down so dramatically, you might be right about the fix. You might have replied to the OP with that, and skipped the needless (and wrong) nitpick about plumber's tape. HTH! (But not betting on it.) BS |
#5
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Creeping seatpost
Bill Sornson wrote:
Jobst Brandt wrote: Bill Sornson wrote: Over the course of an hour' ride my seatpost will get pounded into the frame. This is a stock Trek 7200 hybrid and I'm reluctant to tighten the [nylon?] clamp any more. (Yes, I'm a large rider.) The problem will only get worse over time. I'm considering green Loctite. Will that work? Anyone have a better suggestion? Lots of things you can do. Assuming the post is correct (accurate) size, you can try a little plumber's tape or other "shim type" fix; or use a clamp of sorts above the insertion point to help keep the post from sliding down. (Plastic blinky holder or a full on hose clamp, for examples.) The OE clamp shouldn't be nylon, I wouldn't think. Mine are all metal and I tend to over-tighten stuff; haven't had a problem yet. Loctite might work, but I'd worry about it causing a "frozen" post. Others may have experience with it though... If it's really sliding all the way into the frame on rides, then I'd say your post is undersized. Visit a bike shop to measure, maybe? Well, plumbers tape (ain't tape) is thick steel. Geez, Jobst, for a humorless pedant you sure are funny sometimes. A) It's plumber's tape with an apostrophe. B) The common variety sold in Home Despot and every other hardware store is thin, teflon wrapping, not "thick steel" /strapping/. Very first Google hit: http://www.wisegeek.com/what-is-plumbers-tape.htm I'd try a section out of a soda-pop can or beer can. They are easily cut with household scissors into a one inch wide band, and see if that can be made to fit. One full wrap or even more should do the job if it really is an undersized post that it seems to be. Use grease for final tightening to prevent future water intrusion. Jobst Brandt Since it's sliding down so dramatically, you might be right about the fix. You might have replied to the OP with that, and skipped the needless (and wrong) nitpick about plumber's tape. HTH! (But not betting on it.) BS PS: You also deleted the OP's attribution. Yet another Usenet /faux pas/... |
#6
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Creeping seatpost
On Mar 3, 8:44*pm, "Jack Myers" wrote:
Over the course of an hour' ride my seatpost will get pounded into the frame. This is a stock Trek 7200 hybrid and I'm reluctant to tighten the [nylon?] clamp any more. (Yes, I'm a large rider.) The problem will only get worse over time. I'm considering green Loktite. Will that work? Anyone have a better suggestion? -- Jack Myers / Westminster, California, USA Our policy is, when in doubt, do the right thing. * * * * * * * * -- Roy L. Ash, ex-president, Litton Industries The clamp is probably aluminum -- make sure the screw threads are duly lubricated. You could also try friction paste between seat post & frame. Tacx & Ritchey sell it, to name two. |
#7
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Creeping seatpost
"Sergio Moretti" wrote in message ... On Mar 3, 8:44 pm, "Jack Myers" wrote: Over the course of an hour' ride my seatpost will get pounded into the frame. This is a stock Trek 7200 hybrid and I'm reluctant to tighten the [nylon?] clamp any more. (Yes, I'm a large rider.) The problem will only get worse over time. I'm considering green Loktite. Will that work? Anyone have a better suggestion? -- Jack Myers / Westminster, California, USA Our policy is, when in doubt, do the right thing. -- Roy L. Ash, ex-president, Litton Industries The clamp is probably aluminum -- make sure the screw threads are duly lubricated. You could also try friction paste between seat post & frame. Tacx & Ritchey sell it, to name two. If you (or your dad/granddad) is old school, he's sure to have a small container of valve grinding paste hanging around somewhere. Its just the right grit size to stop movement, all embedded in a lubricant. Been using it for years in an old aluminium CADEX where I'm always adjusting the seat height - and can't be bothered with a too tight clamp. Hugh Fenton |
#8
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Creeping seatpost
"Jack Myers" wrote in message
... Over the course of an hour' ride my seatpost will get pounded into the frame. This is a stock Trek 7200 hybrid and I'm reluctant to tighten the [nylon?] clamp any more. (Yes, I'm a large rider.) The problem will only get worse over time. I'm considering green Loktite. Will that work? Anyone have a better suggestion? -- Jack Myers / Westminster, California, USA Our policy is, when in doubt, do the right thing. -- Roy L. Ash, ex-president, Litton Industries Have you brought it back to the shop it came from? It could be a slightly-undersized seatpost, or a clamp that's not exerting enough force. Whatever the case, any decent shop should take such an issue seriously on a bike they sold, and help work out a solution. Or have you already done that without success? If the post *is* undersized, and it's the one that came with the bike, it makes a lot more sense to get a post that works for it instead of a kludge fix found on the 'net. If it's a used bike that's been through the war, then all bets are off and maybe the frame is distorted enough in the seatpost area that a kludge is the best you can do. --Mike Jacoubowsky Chain Reaction Bicycles www.ChainReaction.com Redwood City & Los Altos, CA USA |
#9
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Creeping seatpost
On 2010-03-04, Jack Myers wrote:
Over the course of an hour' ride my seatpost will get pounded into the frame. This is a stock Trek 7200 hybrid and I'm reluctant to tighten the [nylon?] clamp any more. (Yes, I'm a large rider.) The problem will only get worse over time. I'm considering green Loktite. Will that work? Anyone have a better suggestion? Get a better clamp. They're replaceable and just sit on the top of the seat-tube. This is the best one I've used: http://www.identitibikes.com/identit...php?id=SCIDB28 Put a bit of grease on the bolt on the clamp so you're sure to be tightening it up properly. |
#10
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Creeping seatpost
Ben C writes:
On 2010-03-04, Jack Myers wrote: Over the course of an hour' ride my seatpost will get pounded into the frame. This is a stock Trek 7200 hybrid and I'm reluctant to tighten the [nylon?] clamp any more. (Yes, I'm a large rider.) The problem will only get worse over time. I'm considering green Loktite. Will that work? Anyone have a better suggestion? Get a better clamp. They're replaceable and just sit on the top of the seat-tube. This is the best one I've used: http://www.identitibikes.com/identit...php?id=SCIDB28 Put a bit of grease on the bolt on the clamp so you're sure to be tightening it up properly. Adding grease would make zero difference to the tightening. The considerable force applied for the final tight turns would really not be affected at that point by any grease. |
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