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bonehead move: seatpost binder bolt - tighter not better(5 posts)

bonehead move: seatpost binder bolt - tighter not betterDaveG
Aug 26, 2001 4:10 PM
I pulled a major bonehead mechanic move today. After adjusting my seatpost position yesterday and then putting in a 40 miler, I decided before my ride today that I would just tweak the seatpost binder bolt a bit to make sure it was snug. I didn't think I put that much muscle into it, but I heard a loud pop as the bolt snapped in two. It could have been much worse, like damage to the seatpost clamp. Fortunately my backup bike was ready to go so I didn't have to bag the ride. In the future I think I'll be using a torque wrench.
re: been there... done... that...Akirasho
Aug 26, 2001 5:13 PM
...tweaking a Syncros post before a ride... just a bit... only to have the saddle fall into my hands as I "gently" torqued.

A friend of mine had a similar experience just before the start of a TT as he adjusted a RaceFace post. We searched our vehicles (and extra equipment) for any like bolt... and actually found one (amazing how many bits and pieces can be interchanged in an emergency)! Held up long enuff for the race.

Be the bike.
In my case...Cliff Oates
Aug 26, 2001 5:23 PM
I stripped the threads. Seatpost binder bolts like to be greased periodically too.

If you ever stop learning things, you probably died, didn't notice it, and someone forgot to point the fact out to you.
Valuable lesson from the seatpost binder boltAlexR
Aug 27, 2001 6:05 AM
Tight enough to do the job is tight enough. I spread out the threads on my old bolt something fierce. When my LBS mechanic gave me a new one he admonished me for gorilla-fisting everything (I've been in there for chainring bolts twice). Tight enough to keep it in place -if you can't manually twist your seat post, it's tight enough.

BTW - aluminum seat post binder bolts are crap.

Alex
A fairly common problem.Spoke Wrench
Aug 27, 2001 11:48 AM
My wife is always asking me to adjust her saddle height on our tandem. I've broken seat binder bolts in the middle of a ride - twice. Our old tandem did not have a donor bolt on it anyplace that I could find. My solution is to carry fewer tools so that I can't make any on-the-road adjustments.

I think that the issue with seat binder bolts is that they tend to bend slightly. Frequent adjusting makes them bend back and forth until they break. I don't think that excessive torque is the determining factor. It seems like when they break, they just "pop."