- Thomson h/bar clamp plate cracking – anyone else!?
I seem to have split the handle bar clamp plate on both my Thomson stems. I guess I must have been overtightening them, I didn't think I was overdoing it to be honest. I've got replacements on order btw. I know I should own a torque wrench and set them at 5.5Nm before anyone states the obvious.
So, a common occurance?Posted 8 years ago
Yeah, form over function is the way to go, eh?
Nah not form OVER function but form WITH function.
The Elite stem has the function, form and even safety built in, with the steerer clamp bolts not in the knee/nut zone… They should have used the same method on the X4.
edit… woodsman, where is the plate cracked? Any pictures?Posted 8 years agoMunqe-chickMember
(Mr MC posting) are you torquing them up in the right order? For any application where multiple bolts hold components flat youre supposed to work opposites, so if you numbered the bolts clockwise you'd tighten 1, then 3, then 2 then 4.
First came across this re-fitting a cylinder head to an engine but it holds for all such situations.
Personally never heard of ANY stem plate breaking.Posted 8 years ago
I'm quite used to the cylinder head torque sequence so, no that's not to blame. I'll post up a pic soon, once I've hosted it etc. Cracked in the middle, lateral, same on my other bike, also crack in the steerer clamp too (microscopic) same as a mates. Think I've been riding with it like that for ages. Only reason checked, was that I jumped a couple of flights of concrete steps after a eve ride, and something didn't feel quite right after – not as hardcore as it sounds, honest!Posted 8 years agoclubberMember
As above, you need to make sure that they're all torqued up correctly but arguably more important is to ensure that the face plate has even gaps between the face plate and the stem (ie left and right) on both top/bottom. It's very easy to torque the bolts properly but to have the face plate permanently twisted by not having even gaps – this will likely cause cracking eventually.Posted 8 years ago
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