[Closed] Slipping seatpost..

My LBS put on some "grease" to stop my Joplin sliding around. Did the job, but wasn't the carbon stuff.

Bump...

Same issue on a road bike, carbon post and frame.....

tried a smear of grease to avoid it seizing, issue was bad, tried copper slip (in the hope that the bigger particles might cause more friction), worse than ever... it gunna be completely cleaned before tonights ride.

Same problem here!

Asked the guy in Halfords 😯 and he didn't have a solution. But then, Halfords is not STW...

I mounted a cheap flashy light bracket to the seat tube. Two birds, one stone 🙂

Or maybe a small blob of screwlock. Enough to stop the movement when you don't want it, but possible to 'break the seal' if you do need to remove it?

Carbon assembly paste will do it.

Have a look for Ritchey Liquid Torque one sachet is enough for a several seatposts/bars

TBF I think my mudguard was actually helping stop the issue, took off yesterday cause it doesn't stop dust, might try another light mount as suggested
(my light is just below the saddle to stop the unit bouncing off, like numerous others)

Hmmm £3 for 5g for that ritchey stuff, or £8 for 50g of finish lines stuff.. cheers for the thought though.

[url= http://www.chainreactioncycles.com/Models.aspx?ModelID=75810 ]this may work[/url]

Edit> rocketman's idea is better value < edit

I am definitely heading that way, just quite expensive stuff ain't it, so thought I'd ask before placing an order...

I made a little drinks can shim to take up the looseness, and had no slipping issues since.

[url= http://www.chainreactioncycles.com/Models.aspx?ModelID=30012 ]This[/url]

Seat clamp should be more more than 5nm, if it's more then there is something wrong.

I also heard that hairspray can work,but I have no idea if this is true as I don't use hairspray 🙂

Is it impossible that the clamp is to blame?

Mine seems to grip - it definitely narrows the seat tube to a degree - but maybe not enough?

i had this with a steel frame / thomson post and a steel frame / easton post.

no matter how tight i tried to clamp it the seat could be rotated.

i bought some pace carbon assembly paste and with just a little bit on it fixed the problem. It was expensive but will probably last forever as i need so little.

man I'm gunna post more bike threads on the Chat forum, it's a lot friendlier & you actually get some help... gunna buy some carbon paste

cheers guys.

...bugger and then the Mods decide to move the thread to the bike forum...
<slow hand clap>

<Bugger, wrong fourm... Mod's if you please>

Done. For future reference, if you report the post (a follow-up will do) we'll probably pick it up faster.

man I'm gunna post more bike threads on the Chat forum, it's a lot friendlier & you actually get some help...

Oh. Er, sorry. (-:

I'm gunna post more bike threads on the Chat forum, it's a lot friendlier & you actually get some help

Eek! The seatpost thread of tolerance is suddenly exposed to the bite of the Bike Forum! 😉

Carbon paste for me, too, I think.

hah ninja editing too.. I looked after posting, you can't report you own posts...

Carbon paste purchase imminent, thankyou!
Local LBS had been scratching their heads over this for a while...

Cougar - Moderator

<Bugger, wrong fourm... Mod's if you please>

Done. For future reference, if you report the post (a follow-up will do) we'll probably pick it up faster.

CaptC wiggle has the finish line stuff for £8, seem the best value.
But they've no FL wet lube (120ml), what is the world coming to?

if you have a quick release seatpost clamp, make sure the clamp cam/mechanism is well greased and it all move correctly inc in the clamp..

surprising how much less tight you can get a clamp if is a bit dry/dirty

If the carbon past does not work, get a double clamp like this

[img] [/img]

carbon paste and small cable ties wedged in the "gap" on my chinese carbon frames have worked very well, that and using a clamp with a bushing the bolt screws into (thomson/kcnc), as opposed to a wrap around type like a Hope, seemed to apply more even pressure

Took a look at the clamp last night, it not a 'normal' one. It's a whyte unit with a strange wedge that's pushed onto the post by the clamp, rather than clamping the tube. Anyway wiggle says the paste is on the way, & I'm gunna dig out an old light clamp to help secure it, & maybe stick a shim under the seat clamp wedge...

unless I've misunderstood you, you can't report your own posts.

You misunderstood him, by follow up he means a reply.

Slipping post can often be a dirty seat clamp, make sure it's clean including the bolt and give it a grease.

I recently had the same problem and my LBS advised swapping from a QR to a bolt on. They said that the QR clamps go out of shape so that even though it feels like you're doing it up very tightly it's still not gripping properly.

I went with this and have had no problem since.

My reverb was sliding up and down regardless of how tight I did up the QR, in fact the LBS called up the tech place for reverb and apparently my reverb has blown one of its seals because I overtightened the QR. I've bought a bolt version now so I can tighten to the recommended torque.

If it's a Whyte clamp, take it apart, clean everything and lightly grease the wedge mechanism (ordinary grease). I've got 4 Whyte's with that type of clamp and I've never had a problem.

Edit: I've just found the Original Whyte 2006 user manual and it recommends greasing the seat post wedge mechanism once a month with Castrol LM grease.

tooks it to pieces last night cleaned & greased, then rode, had to raise it about 8 times (only a cm but it annoys me now I know its slipping) in a 1.5-2hr ride... like I said above, awaiting carbon paste delivery now...

zippy, my only other thought is the thickness of the seat tube walls: iirc it was early models of the kinesis decade that had to have specially machined/modified seatclamps because the tube wall was so slim that most seatclamps tightened on the seatpost not the frame.

If you look here:- [url= http://www.whytebikes.com/2006/ ]http://www.whytebikes.com/2006/[/url] and find the Whyte 19 user manual there's a nice diagram of the two types of clamp and the maintenance instructions.

ok, if anything that re-assuring that they not just suddenly come up with this idea..the "Getta-grip" been around a while.

But as you must know, there's not a whole lot you can do to get it wrong, when tightening it.. so I think maybe my post is slightly undersized or the seat tube slightly bigger than it should be, either was even when clamped up really hard, it still moves down.
My lardy arse bouncing up & down on it may big a big part of the equation though..

clean it [u]all[/u] properly, very fine smear of grease* on the post and a good qr.

recently had a problem with one on a Trek Fuel Ex7, the qr was just rubbish, the plastic bush had disintigrated and so all force being applied went into bending the qr. replaced with a qr with a brass bush, bingo.

yankee tat not suitable for UK riding.

*carbon as appropriate.