[JohnE]

My Rocky Mt Altitude 70 seat post slips constantly, no matter how tight/loose/in the middle I reef down the qr. Its a carbon tube, with a RF post...cleaned them both to showroom new, and it still slips. Checked the RM web site for recalls, and it shows nothing for that year/model.

Any ideas? Was thinking about a post with ridges along it, like the Thomson...more traction w/in the tube? Dont think shimming will help...

 

[Sghost]

the qr.

^^

Also, never heard of a slipping Thomson.

 

[syadasti]

http://www.tacx.com/en/producten/extras/Carbon_pasta/index.dot

 

[sanjuro]

Here is a simple one:

Get a blinkie seat post clamp and slap it on right above the actual clamp.

I did that once and it fixed a slipping post.

 

[JohnE]

Gonna try some grease with a little dirt in there to increase friction within the tube itself...

 

[eaterofdog]

You need carbon fiber grip grease. If you use dirt, some of the grains will be large enough to put stars in your post, which will be the beginning of the end.

 

[JohnE]

Like Syadasti was syaggesting?

 

[Nick]

Try it now?

Gonna try some grease with a little dirt in there to increase friction within the tube itself...

Holy crap, you must be an engineer.
Seriously though, take some measurements and see if maybe the OD of your post is off. What size post and seat tube are you working with here?

 

[syadasti]

If you don't want to buy the tacx stuff you could try talcum powder.

Toothpaste is another option which has a mild abrasive in it but nothing like sand or dirt.

 

[oldfart]

Yep try carbon assembly paste. Might not always work though. I have a Ibis Tranny which came with a Thomson post. Slipped and creaked with assembly paste or without and the qr had to be really tight. Uncomfortably tight. Tried a Pro XCR post and problem solved. Thomson posts are slightly smaller than the Pro and many others so I have read.

 

[gonefirefightin]

one wrap of electrical tape