Stem slipping – just keep tightening?
That’s kinda normal, is the headset coming loose or the bars moving when riding? Standard post crash (especially mid-race) procedure for straightening bars is to just yank them round.
I’ve got a similar problem but the headset is coming loose when torqued to the correct spec. I’m reluctant to over-torque though due to a carbon steererPosted 11 months agostumpy01Member
Have you got another stem to try at the same torque?
As above, stem & steerer mating surfaces de-greased?
It would depend how much pressure you are having to apply when holding the front wheel to mis-align the stem, as to whether it would be a problem or not….
If it’s a gentle twist then I’d say it’s not right. If it’s a real heave on the bars while clenching the wheel between your legs as tight as you can, then it’s probably OK.Posted 11 months agoRubber_BuccaneerSubscriber
I had the stem slipping to allow the headset to come loose with a Renthal Apex stem. I cleaned the steerer and stem then reassembled with a smear of carbon assembly paste (despite everything being aluminium) and have not had any further slippage in the last couple of rides. Still only torqued to 5Nm (using a Teng torque wrench that I trust rather than a torque key)Posted 11 months agophiljuniorMember
You really want to make everything super clean with some IPA. You could also use some carbon grip paste to help things along, but you need to be careful you don’t end up with it getting where it shouldn’t and making things wear away that you don’t want to wear away.
FWIW I was quite surprised to see my 3T road stem had a specified torque of 13Nm on the stem clamps – I didn’t dare go that tight (I went to 12Nm). That was M6 bolts though, so the force from that would be equivalent to an M5 at about 10Nm (still “a lot” – probably quite close to yielding the M6 bolt even in quite high grade steels.)
Your steerer should be fine a reasonable amount beyond 5Nm but I would be concerned about the bolts themselves and the stem if that’s what’s specified (it’s not unknown to see cracks on Thomson stems).Posted 11 months ago
I have a 50mm Thomson stem that has a 5nm torque recommendation for tightening to the steerer.
Torquing to this I can still turn the bars under pressure whilst holding the wheel.
I’ve tried 6nm but still the same. 😕
Now I have just gotten myself a torque wrench so in the passed I wouldn’t have given it a second thought and just tightened further but …..
So is something likely to be up or should I just add some more torque 😆Posted 11 months ago
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