Bicycle Mechanics - Stuck seatposts - grease it first!

Bikeforums.net is a forum about nothing but bikes. Our community can help you find information about hard-to-find and localized information like bicycle tours, specialties like where in your area to have your recumbent bike serviced, or what are the best bicycle tires and seats for the activities you use your bike for.




stevage
08-22-09, 11:58 PM
Moral of the story: 28 grams of prevention are worth 454 grams of cure.

What happened:
1) Bought bike from Wiggle.
2) Followed instructions to assemble it. Instructions didn't mention grease, so I just stuck the seatpost in without grease.
3) Rode for a couple of house seatpost totally stuck.
4) Consulted God (http://www.sheldonbrown.com/stuck-seatposts.html).
5) Tried most of the techniques. By twisting really really hard I was able to just twist the seatpost. So I applied technique XI. In the end, I would squeeze a little bit of lube between the "ears", twist about 10°, then repeat. I ended up doing nearly 2 complete laps, something like 50 applications of lube.
6) Finally it loosened up enough to be able to pulled out. Wow, what a lot of hard work. An hour or so of really intense exercise. Wow.

A couple of notes for anyone trying this:
- at first you really don't think the lube is helping. But if you watch closely, it's not pooling up on the outside of the seat tube, so it must be going in.
- it takes a lot of lube!
- I found a good position for twisting was leaning backwards against a wall, one foot on a pedal, bike leaning slightly towards me, front wheel pushing into the wall. Then you can put all your force into the twisting motion without needing to keep your balance or support the bike or anything.
- Sheldon is right, if you can turn the seatpost, "victory is in sight" - but you're not in the final straight yet.

Now to buy some grease...


AEO
08-23-09, 12:16 AM
most times you can work backwards by flipping the bike over and pouring in your favourite penetrating lube down the seat tube through the opening in the BB.

and if your frame isn't aluminum, I hear you can use ammonia to melt the seatpost.

HillRider
08-23-09, 06:37 AM
Another precaution: even if you grease the seatpost (and quill stems too) thoroughly before you install it, remove it every year or so, clean it off and regrease it before reinstallation. That couple of minutes can also save hours of frustration in the future.


JonathanGennick
08-23-09, 07:34 AM
Moral of the story: 28 grams of prevention are worth 454 grams of cure.

What happened:
1) Bought bike from Wiggle.
2) Followed instructions to assemble it. Instructions didn't mention grease, so I just stuck the seatpost in without grease.
3) Rode for a couple of house seatpost totally stuck.

Are you saying that your post got stuck after just riding a short distance down your street?

That doesn't sound to me like a grease-related issue. Grease is to prevent the metal of the post from bonding to that of your bike -- a process that I expect takes at least on the order of months.

stevage
08-30-09, 08:25 AM
>>3) Rode for a couple of house seatpost totally stuck.
>Are you saying that your post got stuck after just riding a short distance down your street?

Ugh, bad typo in OP. I meant "hours". A bit around the neighbourhood, a bit offroad, and a bit, ahem, of foolish stunts to show off the new suspension. Somehow in all that, the seatpost slipped lower and lower, then got wedged.

I guess the point was that there was absolutely nothing to lubricate the two metal parts against each other. In Sheldon's words, it was a "mechanical" problem, rather than a "chemical" one.

joejack951
08-30-09, 08:29 AM
Doesn't sound like grease would have helped much in that situation. Grease only helps prevent corrosion.

If you are currently using a quick release seat clamp and your seat is slipping, I suggest replacing it with a true clamp. They grip much tighter.