Author Topic: Torque settings for brake lever on carbon bars  (Read 349 times)

Torque settings for brake lever on carbon bars
« on: 10 June, 2021, 05:10:32 pm »
I have  shimano 105 11sp controllers on the tandem which has carbon bars.
The LH one came loose on a ride and I nipped it back up again.  Not too tight though - I don't know if it tightens a band around the 'bar or if its a bolt driven on to the 'bar itself, and being carbon I don't want to crush it.

Is there a torque setting for these ?  And does anyone know if its a band or the bolt end direct on the 'bar ?
thanks
Steve

FifeingEejit

  • Not Small
Re: Torque settings for brake lever on carbon bars
« Reply #1 on: 10 June, 2021, 05:17:00 pm »
Iirc carbons usually 5Nm,grip paste helps

Sent from my BKL-L09 using Tapatalk


Re: Torque settings for brake lever on carbon bars
« Reply #2 on: 10 June, 2021, 05:37:14 pm »
I'd be astounded if the fixation method was a bolt end being brought to bear directly on the bar. Surely it's a band-on?
Rust never sleeps

Re: Torque settings for brake lever on carbon bars
« Reply #3 on: 10 June, 2021, 05:37:56 pm »
My 10spd 105 levers use bands, and they surely wouldn't have regressed like that.
Rust never sleeps

Re: Torque settings for brake lever on carbon bars
« Reply #4 on: 10 June, 2021, 05:58:22 pm »
Latest 11 speed 105 (R7000) definitely has a band on fixing.

See Dealer Manual here - https://bike.shimano.com/en-EU/product/component/shimano105-r7000/ST-R7000-R.html

Page 12 says 6-8 N-m torque.
 
But page 10 has the note "Even with the recommended tightening torque, there is a possibility that the carbon handlebars may become damaged and insufficiently tightened. Confirm the
appropriate torque with the bicycle manufacturer or the handlebar manufacturer."

Re: Torque settings for brake lever on carbon bars
« Reply #5 on: 10 June, 2021, 08:15:15 pm »
Thanks people 👍

citoyen

  • Occasionally rides a bike
Re: Torque settings for brake lever on carbon bars
« Reply #6 on: 11 June, 2021, 09:52:22 am »
Iirc carbons usually 5Nm,grip paste helps

Sent from my BKL-L09 using Tapatalk

Interesting. I wouldn’t have thought of grip paste for this purpose. I use it for carbon seatpost in carbon frame. Would it work the same for metal on carbon?
"The future's all yours, you lousy bicycles."

Re: Torque settings for brake lever on carbon bars
« Reply #7 on: 11 June, 2021, 09:54:42 am »
It’s vaseline filled with sharp sand, so as long as it can dig in to one or both surfaces it ought to provide some extra friction once tightened.

citoyen

  • Occasionally rides a bike
Re: Torque settings for brake lever on carbon bars
« Reply #8 on: 11 June, 2021, 09:56:12 am »
It’s vaseline filled with sharp sand, so as long as it can dig in to one or both surfaces it ought to provide some extra friction once tightened.

:thumbsup:
"The future's all yours, you lousy bicycles."

Re: Torque settings for brake lever on carbon bars
« Reply #9 on: 11 June, 2021, 10:10:25 am »
grip paste or something like 'Carbon adherance compound' sounds so much better than It’s vaseline filled with sharp sand