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seat post(11 posts)

seat postcollinsc
Feb 11, 2002 9:23 PM
dont ask how the hell it happened, but leaving from a stoplight i popped loose my seat at the clamp on the post (not the frame). Took me forever to get it tight again for reasons i couldnt figure out at the time. When I get back and take a look at it, im suprised i made it back. The thing is stripped and of course stripping more and more every time i try to put it back together.

I dont understand how this could happen, the thing has less than 700 miles on it, i weigh 160lbs and I cant imagine being so abusive to a post.

So, any idea what to do about this or do i get to buy a new post? (maybe an excuse to upgrade, too bad im a poorass college boy)

thx
Chad
What kind of seatpost was it??spookyload
Feb 11, 2002 9:31 PM
nm
sorrycollinsc
Feb 11, 2002 9:55 PM
ritchey pro
re: saddle unbolted.guido
Feb 11, 2002 11:09 PM
That happens alot. If they don't strip out, they often break.

When you think about it, that single little bolt, threaded into a little plate, holds all your body weight at times, heaving and crashing all over it, in weird, tangential forces, constantly trying to wiggle it loose. They make these bolts as light as possible, and they strip out easily. Campy had a two bolt design that was rock solid, but considered too heavy. Trackies kept using them for years after everybody else went to single bolt designs. I think there are still 2 bolt designs out there, and they're light, too.

Glad you made it home! I had to post home once, holding the saddle between my legs. Fortunately, it was only about 4 miles.

Maybe the LBS or hardware store has a stainless steel or nickle plated bolt and nut that would be stronger, if a little heavier, as a temporary repair until you can upgrade to a stronger seatpost clamp.
re: its actually not the boltcollinsc
Feb 11, 2002 11:33 PM
its the top plate of the clamping mechanism that bolt threads into, i could understand the bolt stripping. The problem is I cant even rig up some job with a nut since the bolt is barely long enough to come through the top of the clamp.

I actually have on my desk here a little piece of metal coil, about one and a half revoultions, that came out of this top clamp piece.

what i really cant understand is why this even exists. seems like it would make more sense for the clamp mechanism to be itself threaded instead of having this little bit of wire stuff running through it.
re: its actually not the boltxxl
Feb 12, 2002 2:27 AM
Is that little coil of metal look sort of like a QR spring, or is it a piece of shaved metal? I'm not familiar with the Ritchey, but I do know it's not hard to overtighten (and strip) that seat bolt. Could this be the case?

In any event, as you mentioned poverty, just about every LBS has old seatposts sitting around in buckets that you could probably cadge off them cheaper than even a new bolt. Maybe not exceptional quality, probably SR/Laprade, but hey, it's a seatpost, right; how good does it need to be?
re: its actually not the boltSteve H
Feb 12, 2002 6:05 AM
I don't know if you bought your bike new, but if it was previously owned, someone may have made a repair with a helicoil. This is a thread repair kit and they will not take a lot of pressure. They look like a tightly coiled spring.
re: its actually not the boltmaximum15
Feb 12, 2002 9:45 AM
Although I haven't actually seen your parts, after many years of experience, I would bet that coil of metal is the female threads sheared from the clamp plate or threads off of the bolt. It would be too expensive and would not save any weight to make threads seperate. I would further speculate that Ritchey will send you another clamp plate if you are the original purchaser.
Yep, another clamp plate.guido
Feb 12, 2002 11:50 PM
A longer bolt attached to a nut on top of the plate might hold everything together, but the reason the plate is threaded is because there's alot of sideways force trying to loosen everything up. A separate bolt would probably not hold the seat from slipping out of level. LBS probably has an inexpensive seatpost, or Ritchey might send you a replacement plate.
re: cheap, safe solutiondzrider
Feb 12, 2002 7:57 AM
Go to a hardware store, get a nut and allen head bolt long enough to go through the clamp, and bolt it back together. If possible, get stainless steel. Several posters have warned of stripping threads by over-tightening. Be certain that it's tight enough to allow absolutely no play which can also, over time, lead to failure.
re: cheap, safe solutionDINOSAUR
Feb 12, 2002 8:43 AM
Yeah, over-tightening can lead to overstripping the seat clamp bolt. Another alternative is to go to a flip-lock binder bolt, such as Salsa. They say the flick-locks clamp on tighter. The stainless steel hardware store is a good fix also...