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First day on new frame- seatpost binder bolt breaks(8 posts)

First day on new frame- seatpost binder bolt breaksdawgcatchr
Aug 26, 2003 10:00 PM
I just finished my new build last night-I was riding the frame for the first time today, and couldn't seem to get the seat post clamp tight out on my ride-it kept slipping. Finally, while trying to tighten it for the 5th time, I overtorqued the binder bolt and stripped it, leaving me to ride home while standing on the pedals for 10 miles.

The frame is a Fondriest Carb Level. I was using the supplied seatpost binder. The post is a Thomson. It slides in farily snug, although I don't have to fight it to get it on (assuming I am using a light layer of grease). I am currently keeping the seat up with a huge quick release-it is unlikely to strip, even if it looks hideous.

What can I do to ensure that my seat stays tight next time? The Fondriest comes with 2 seatpost binders (maybe this happens often on the Carb Level) so I have a spare to install. But, I am worried that I will strip the other bolt the same way that I stripped this one.
this happens to me a lot.gregario
Aug 27, 2003 4:36 AM
I've built up two bikes the last year and I've broken the bolt in the collars in both. I replaced both with the Salsa Lip-lock collar and haven't had a problem with them since. The Salsa's nut portion is free to swivel as you tighten the bolt, and therefore change the angle, which takes strain off the threads. Not all collars are like that.
ditto on the Salsastratoshark
Aug 27, 2003 5:22 AM
My mtb post slipped with the Trek-supplied quick release binder. Coke can shims didn't work. Installed the Salsa Lip-lock, no slipping since, and I don't have the bolt tightened to the max either. Good product, I recommend it.
my only campy part and it breaks nmTheTank
Aug 27, 2003 6:40 AM
re: First day on new frame- seatpost binder bolt breakstarwheel
Aug 27, 2003 7:57 AM
I kept breaking seat post bolts until someone here (Nessism) told me the probable cause. Binder bolts are sometimes too long to sufficiently tighten them and they bottom out, causing you to over-tighten and break them. The fix is to add a washer or two to the bolt. Since I've added some washers, I've had no problems with slippage and only broken one bolt (which is good for me) and that was from overtightening.
re: First day on new frame- seatpost binder bolt breaksMShaw
Aug 27, 2003 8:56 AM
Just a note, I thought you weren't supposed to use grease on carbon bikes.


Don't rule out the Thomson post as the culprit ...HouseMoney
Aug 27, 2003 9:16 AM
I've had a hard time getting my Thomson mountain post to stay put in 3 different frames (same seat tube diam). When using a Salsa quick release, it usually slips the same amount each ride, no matter how tight I make it. Even with a standard clamp, unless I remember to really tighten it snugly, the Thomson will slip then, too. I know of 2 other people who have had this problem with Thomsons.

When I sometimes switch to a RaceFace post & the Salsa QR clamp, the post doesn't budge.
Don't rule out the Thomson post as the culprit ...bburgbiker
Aug 27, 2003 8:28 PM
I had this same problem with a Thomson post i had been using on my mtn. bike for about 2-3 years. when i had the wrench at the shop check the diameter of the post where i had been clamping it with the binder it turned out that the post had crimped inward at that spot by .1mm. not much but enough to make the post slip. the good news is that the shop made a call to Thomson and i was able to warrenty it no problem. i'd look into a possible warrenty situation if i were you.