The seatpost on my XLT 2.0 likes to slide down about an inch as I ride...I put it just where I want it, clamp the QR as tight as possible, and in 10 to 20 minutes, its right back down to the same spot--it doesn't go any lower than this, however. What's the deal, and how do I fix it and keep the QR???

I have a similar problem and I have attributed it to the internal butting of an alloy post. The thinner walls towards the center of the post might give alittle under stress causing the post to slide a little until it meets a spot where the post walls begin to thicken.

Sound plausible? It does to me, but I could be wrong. Maybe seatposts aren't butted the way frame tubing is. I just want to sound clever.

MBA suggested a temporary solution to this in an article this month about solving problems on the trail. They suggested sprinkling fine dust from the trail on your post, giving it a little more grip. I tried it and it worked.

I got rid of the no name QR clamp and bought a Salsa flip lock. It works much better. Now I only get about a 1/4" slip over about 20 miles on my Dakar Pro.

......chalk.

If the "fine dirt" option doesn't work, I would be concerned it may make the problem worse. Fine dust and sand can be quite abbrasive, and you may end up polishing the surfaces, and removing additional material.

You may also want to try measuring (with a vernier caliper) both the post and the tube, and see how they compare. Make sure you measure a couple of places, as one or both could be ovalized. Unlikely, but possible.

Good luck.

I also have an 2004 XLT 2.0 and the seat post slides about inch or slightly more while riding a short period of time. It can be very annoying, especially because the clamp is so tight (to minimize the slipping) that it is very difficult to open and close.

An earlier post mentioned switching seat clamps to, for example, a salsa. My LBS recommended against this because the salsa clamps provide so much force that the seat tube and/or seat post can be deformed.

Currently, I am using a soda can shim and this has stopped the slipping. But this should not be necessary on a $2k bike. My LBS agrees, but their only suggestion is that I buy a different seatpost. I don't think I should have to buy a component because of the manufacturer's defect.

Any thoughts.

I got rid of the no name QR clamp and bought a Salsa flip lock. It works much better. Now I only get about a 1/4" slip over about 20 miles on my Dakar Pro.


I've got a Salsa Lip Lock non QR on my '03 XLT 2.0 and the post is absolutely locked in place now, no movement at all. When loosened I've seen no deforming of either the post or the seattube.

yeah, get rid of some of the grease on the post and it'll hold much better. Sand or a few crushed up leaves all work great.

I retired my XLT 2 after various failures. I moved the seat and post (which had a similar sliding problem), to the new frame. It slid. I then installed a Thomson seat post on the new frame. The Thomson seat post finish has closely spaced rings etched into the surface. This provides a rough surface texture. This seat post does not slide. I believe the culprit here is the smooth finish of the stock XLT seat post.

I have a 2002 Dakota AL (which I love) and the Thompson Elite seatpost slips down each and every ride. Cleaning most of any grease and clamping the stock QR clamp TIGHt helped, but hasn't eliminated it. I have been thinking about either trying a Salsa clamp, or going to an allen-bolt clamp and trying a Gravity Dropper seatpost.

My first thought is that Jamis may be reaming out the seat tube to the high-side of the accepted tolerance range during pre-weld fixturing. It can be no cooincidence that so many Jamis frames have the same issue.

Dan

Had the same problem with my Durango SX - for both the original seatpost and the Thudbuster I replaced it with. Both would drop up to two inches over the course of a ride. A Salsa clamp took care of it. No worries now.

I have sold the XLT2 frame, so I cannot measure the seat tube interior diameter or the stock post diameter. As noted in my prior message,the stock Jamis post slid in both the XLT2 frame and my new frame. I substituted a Thomas Elite and the sliding problem was eliminated. On the new frame, with the seat clamp closed, I measure 1.06" interior tube diameter and 1.06" seat post diameter. Perhaps we can compare measurements and see what we learn.

Well, I just picked up a Hope seat clamp/QR skewer, and it looks far more robust than the stck Jamis item. (it's CNC'd, and nicer looking than a Salsa IMHO)

Hopefully that'll geterdone.

I'm gonna take a few pics of my Jamis and postem up for you all to see.

Dan

You might try looking at a Gravitydropper or Descender Seatpost. The main reason guys want a quick release is to be able to get off and raise or lower their seat. With these seatposts, you really dont need a quick release anymore. The website is www.gravitydropper.com







The seatpost on my XLT 2.0 likes to slide down about an inch as I ride...I put it just where I want it, clamp the QR as tight as possible, and in 10 to 20 minutes, its right back down to the same spot--it doesn't go any lower than this, however. What's the deal, and how do I fix it and keep the QR???

Just use basic kids chalk still grease the inside of seat tube and rub chalk on seat post should take care of problem.