MTB Seatpost keeps slipping - help!

[Johan Bornman]

A little bit of Locktite for threads may do the job.

 

No it won't. There's plenty of friction in those thread ramps to keep the bolt from not coming loose. The issue is not enough friction between post and pillar. This can be had by a larger clamping force or gritty stuff in there.

 

[MintSauce]

Do many people have this problem...?

 

It seems like such a simple bit of engineering....surely you shouldn't need a botch job to keep a seatpost up...?

 

Is there perhaps some design flaw or manufacturing defect on the frame...?

 

Have you tried a different seatpost...?

 

 

 

 

 

[Tumbleweed]

Do many people have this problem...?It seems like such a simple bit of engineering....surely you shouldn't need a botch job to keep a seatpost up...?Is there perhaps some design flaw or manufacturing defect on the frame...?Have you tried a different seatpost...?

 

 

 

 

two different bikes, same problem. common denominator: rider. problem solved.

[mudda]

Lol the rider!!!!!

 

Damn right I weigh in at a heavy 80kg depending on the amount of beers i had on the weekend

 

 

 

[Master216]

The problem comes down to your bike being too clean......if it was dirty and grity it would happen!!decided to give my bike a solid clean all over and guess what......never use to happen, but now it does.....a slipping flipping seatpost!!!!

[Goodbadugly]

I use a few drops of Loctite on the post where it enters the frame. Loctite is drawn in by capillary force. Then tighten the clamp and wait 24 hours. Even works for a Easton ec70 post.

[Pocketbikes]

I like the idea of that seat post ring. It will definitely help, but it's also useful if you have to keep taking your seat off to fit the bike in the car. Just fit the seat post in till the ring seats with the frame and tighten the post's clamp, it will work like a depth gauge.

 

[webs]

I also had this problem for about a week now. I tried the insulation tape, and it worked. Just put the tape on tight.

[camelman]

Use a torque wrench and tighten it to the required torque.  Sometimes we are prone to underclamping it in an attempt not to break anything.  A wider clamp might also help to maximise the area of friction.  As previosly suggested, cleaning the whole area with surgical alchohol might also help to increase the friction between the two.

[L'Bie]

Lol the rider!!!!!

Damn right I weigh in at a heavy 80kg depending on the amount of beers i had on the weekend

I weigh in at over 85Kgs and I have had this problem from waaaayy back when Istarted cycling. What makes it more difficult, I absolutely hate noises eminating from my bike. Most of these come from my seat and post. The answer earlier years was to clean and lightly grease - Very lightly  - and then clamp it down hard.  I mean real hard! See, my seat and post is removed everytime I load the bike on the rack. That worked on the old Gaint840 as the post had a nice wall thickness. With the new Scott, everything is OE and it doensn't matter how thight I clamp it, It slips!!! My 2 cents worth is that the gritty compound makes sence. The lockring is bound to create another friction point on top of the down tube and also likely to squeek with every pedal stroke. I will go for the gritty compound. Sounds like the post can still be removed with the quick release and I doubt it will squeek like the locking bolt thingy.

[AndreZA]

I've seen pics of people swinging the post clamp around because of this problem. The slot at the back and the bolts at the front.

 

 

[Tinker]

I have the same problem with my seat slipping down... I will get the BF to check out these ideas on how to fix it... THANX!

[SURFER]

Had the same problem with a Scott scale. Used carbon paste and also masking tape around seatpost. worked for me.

[Christopher Brunsdon]

Had the same problem for a couple of months, found I was not keeping it clean on the inside and sand was in the tube was preventing a tight clamp. Learnt to keep it clean and never a problem since then.

 

BTW, I weigh 94kg.

[Bat-ass]

just tighten the god damn seat post colar tiiiight... FT... like till you hear a "crack" then back it off a 1/4 turn!!!

[SL7]

My beer only comes in bottles. Damn!