- Slipping seat post solutions?
I had the same problem with a carbon post on my Niner
with a Hope bolt up, I ended up trying to do it up so tight I popped the top off of the bolt, which wasn't actually that hard, bolt was made of cheese.
Salsa QR now and it's not budged
I think it doesn't help that Hope don't use a spherical end on one side of the clamp like Salsa, Thompson, OnOne…..Posted 7 years ago
I have a Ti 456 frame which I love, but I'm having a few issues with the seatpost. I'm currently using a Thomson 400mm in line one and it creaks, however if I grease it it slips down in the frame regardless of how tightly I do up the QR (a new style hope one).
I tried carbon paste in case that was enough to stop the creaking but not slippy enough to cause the post to slip – but it still creaks. I've also tried a synchros post with similar results. I suspect the seat tube is very fractionally too large for the posts, but not large enough for the next size up post or to fit an additional shim.
Any suggestions as to how I could fix this? I was wondering if I could get a seatpost that was on the fat side of 27.2? Alternatively the frame appears to have a factory fitted shim to reduce the inside diameter of the seat tube to 27.2…. are these generally glued in or just press fit? Can they be replaced?
I don't fancy swapping to a bolt up seat post clamp as I like to be able to drop the saddle easily.
Any suggestions gratefully received.Posted 7 years ago
had this on a inbred, tried the post in two other frames (soul+5spot) to check the post and its fine, got a onone seatlamp qr which is shown on the website with a brass bushing and they sent one with a plastic bushing which broke on fitting supposed to be a 29.8 seatube but a 30mm salsa liplock needs cranking silly tight to stop it slipping, dont think the tolerances are quite as tight as they could be imoPosted 7 years agoPePPeRSubscriber
I've got the same problem on a Thomson 27.2 400mm post on my Gary Fisher Rig, I seem to have finally cured it with a new Thomson seat clamp (free gift woohoo) and a big shim of coke can and carbon anti slip paste!
I tried several different pieces of coke can until I found the shim size that made it nice and tight (nearly all the way round the post as it happens) and then anti slipped it and locked it all in place. That seems to have finally done the trick without needing to try and clamp the seat post tighter than they ought to be.Posted 7 years agob rMember
I've a 456Ti and a new-style Hope seat post QR clamp, no problems at all.
Run it with a well used I-Beam seatpost, and I've rather weak hands – so not done up tight at all.
Maybe your post is too shiny?
I had an Enduro a few years ago and the Thompson seatpost was always slipping on that until I went to a Salsa clamp.Posted 7 years agosolariderSubscriber
Try a good old fashioned allen key clamp? Quick release is good for the small amount of time you actually want to drop your post or adjust your saddle height. All the rest of the time (ie the majority), you just want your seat clamp to hold tight, and the Allen key version will always be better than the QR version.Posted 7 years ago
it is a bolted one, liplock not fliplockPosted 7 years ago
i think the inside is slightly oversize and the outside is slightly undersized because the post just drops in to the head not a tight fit at all, and the salsa clamp is nearly closed when its tight, the clamp is a 30mm and onone say the inbreds are 29.8, will 0.2 of a mm make any difference?
There do seem to be a lot of people with issues regarding the hope seat clamps, I'll have to try a different make and see what happens.
Don't fancy a shim as it would be a pain raising and lowering the saddle.
There are definitely noticeable differences in diameter between different makes of seat post, I tried a random selection last night and some of the cheaper ones were definitely a tighter fit. Unfortunately they were also too short.Posted 7 years agomatthewlhomeMember
i had this on my 456 summer season with both the on-one clamp and then with a fancy chromag one too (not a thompson post though). I have got some of the pace carbon paste and put that on the seatpost, as well as on the outside of the seat tube where the clamp sits. I also pulled the qr mechanism apart and put some anti seize on the contact surfaces. I can now do up the clamp with a lot less force, and the post has stayed put for the first time on my normal route.
I think it must be down to tiny differences in acceptable tolerances or sumfink.Posted 7 years agogiantjasonSubscriber
i have experienced this problem recently, also with a hope bolt up clamp. i kept tightening the bolt to stop it from slipping until it eventually broke.
as said above i have now went for a cheaper bolt up version (that actually tightens without breaking) and thoroughly clean the post. so far it seems to be workingPosted 7 years agowooolMember
Had this issue with mine, when using a height adjustable seat post, with a Hope standard clamp, QR clamp and the small clamp provided by Onone.
Tried using grease, ti-prep, pace carbon paste, etc. on the post to no avail i.e. just kept creaking, slipping.
Eventually went for a double bolt clamp done up enough (not mega tight) so the post still works. Every now and then I get a wee creak, but it's not all the time.
The creaking BB is my next thing to sort out…Posted 7 years ago
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