seatpost slipping: suggestions?
 

so here's my situation: aluminum post in a steel frame. and it's slipping.

originally it was just post in frame. after having it slip considerably, i applied grease inside the top of the seat tube. this mitigated the slippage but it still loses a few mm's each ride.

any suggestions for further fixes to keep the alu post from slipping?

one option, adam hansen uses a second seat collar. thoughts?

http://www.cyclingnews.com/features/...lium-sl/297688

another option is to try another post. but it's a 31.6 post and only other one i have is carbon. if i try the carbon, i assume i should clean out the grease from the seat tube and apply carbon paste? any downside to residual grease mixing with carbon paste?

to sum up my situation in a word: help!

thanks!

Good bike shop will have a knurling tool...makes ridges in post, no slip no mas.

I had the same problem with a cheap steel commuter frame a Pake C'Mute.

I use carbon paste on an aluminum post and now it does not slip without having to result in excessive torque on the binder bolt.

The very smooth and polished Easton Dura-Ace post used to slip in my Kirk,
and i put some of the Finish Line fiber grip on it, which seems to have solved
the problem.

http://www.finishlineusa.com/product...ts/fiber-grip-

-g

Finish Line
 

That is the same stuff I use.

Doesn't have to be carbon to use carbon paste.

Me too. Cheap and effective.

Another cheap, simple solution is a piece of tape wrapped around the post at the position where it would meet the top of the seat tube. Some type of tape that has a cloth/fabric backing.

I had this problem and it was the fastening nut that was not staying tight (5nm).
A little loc-tite on the threads solved it.

Make sure the clamp bolt is not bottoming out at the coincidental torque to give you SOME clamping force but not ENOUGH.

I've read that grease on carbon posts does something bad like penetrate the epoxy, making the post slip even more and after that, difficult to remove the grease's effect.

Measure your 31.6 post to verify it's not undersized.

According to my Sutherland's manual, the seat tube for your particular mating of steel frame to aluminum post, the seat TUBE can be as large as 31.8mm and still work with your post. Ideally, the seat TUBE would be no larger than 31.65mm.

You could have the "perfect storm" of an oversized seat tube AND undersized seat post.

My only concern with using carbon past is, will it prevent rust in the seat tube and impair seizing of the seat post.

That's what it is designed to do. It's just grease with grit in it.

I had this problem.... I finally realized my seatpost clamp had a crack in it. I used my tail light clamp as a brace of sorts to try to get me the last 50 miles, but it finally broke all the way through and I had to low-rider it to a bike shop for a temp clamp. Fortunately, I was a few miles from a shop- 'cause I probably looked like an idiot

But I obviously rode around with it cracked for some time- I hadn't had any problems, then one day I noticed it had slipped and from that point on I never could get it tight.

A buddy had this problem and had the post knurled. It was fine until the post snapped. Go with paste. Check tube diameter, steel can stretch.

seatpost slipping: suggestions?
 

I had the same problems with my steel and carbon frames, solved with this:
http://www.effettomariposa.eu/en/products/carbogrip/

I have an aluminum EBB in a steel frame. I use this stuff called Oatey's Joint Compound (from Home Depot). No slip and works great. Manufacturer suggests Carbogrip if this doesn't work, but no issues for me. And only $2 for a tube.