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I have a Thomson seatpost in a Norco frame. Both 27.2mm. Even with the seat post clamp removed, it's pretty tough to move it up and down. A bump with the bum to get it down and wiggling the seat (with the rear wheel lifted off the ground) to get it up.
Is there a grease or something I can use to loosen it up? It's my only bike, used for commuting and mtb'ing, so I don't want to get grease marks when the post is up.
Cheers
MTFU and grease it. Current situation sounds like a recipe for disaster.
give the seatpost a very fine rubbing down with some wet and dry.
or try a silicon based spray lube.
Use a [url= http://www.autozone.com/autozone/accessories/OEM-Adjustable-brake-cylinder-hone/_/N-25k5?itemIdentifier=47928_0_0_ ]brake cylinder hone[/url] with a drill in the seat tube.
[img] http://contentinfo.autozone.com/znetcs/product-info/en/US/grn/25028/image/3/ [/img]
Grease it. Leave it up.
Or get a dropper post - grease that too.
Have a read here [url= http://singletrackmag.com/forum/topic/reverb-in-a-carbon-456-and-galvanic-corrosion ]Galvanic Corrosion[/url]
It happens between different materials, e.g. aluminium and steel
Grease marks aren't so bad 🙂
I use grease on all seat posts, only a thin layer mind, similar to the amount i'd use on a Maxle. I store a blob of grease in the seatpost hole at bottom. Whenever I take entire post out to clean/wipedown, reapply a thin layer. Never budged on a ride with QR set properly or left epic grease marks everywhere 🙂
There's a clip on you tube of someone using Coca cola. Works a treat!
Cheers.
I'll get some wet and dry tomorrow and give it a clean before a quick spray.
And to think, I was annoyed by my last bike and the way the seat post dropped whilst I was tightening the clamp; not enough friction!
black thomson post? if its still got any anodising on it then don't rub it down. All you will do it make lit look crap and remove the protective layer making it more likely to corrode.
First thing I would do is check the seat tube for any distortion or intrusion - ie check the top has not been crimped by the clamp and there is no bulges inside from welds etc. If there are then get them sorted. The latter would probably be best done by a decent bike shop or frame builder with a suitable reamer.
If it just looks a bit grubby and corroded down there then bit of wet and dry on a wooden down and gently clean it up. Flush out with some IPA (or vodka) and then use some grease or anti-seize on the post when reinserting.
I'd sand the inside of the frame rather than the post, IME that's where you're likely to have more issues.
Thanks. Should have said I was planning on sanding the tube not the post.
I've had a look and the inside of the seat tube looks a little dirty; nothing worse. Also, a cheapy Kona post moves easily.
Will get some wet and dry after work.
THanks