Technical > Transmission

Broken Twistshifter Bracket

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Prince of Darkness:
Costs £15.99 from SJSC :)

Dave Whittle Thorn Workshop:
You probably just need https://www.sjscycles.co.uk/hub-spares/rohloff-tx20-screws-clamp-for-twistshifter-light-8193/

Its intentionally weak (like a fuse) so that it shears before damaging the handlebar, it was introduced as part of the twist-shifter light concept with the advent of carbon and thin walled alloy bars.

High Moors Drifter:

--- Quote from: Dave Whittle Thorn Workshop on August 23, 2018, 09:57:30 am ---You probably just need https://www.sjscycles.co.uk/hub-spares/rohloff-tx20-screws-clamp-for-twistshifter-light-8193/

Its intentionally weak (like a fuse) so that it shears before damaging the handlebar, it was introduced as part of the twist-shifter light concept with the advent of carbon and thin walled alloy bars.

--- End quote ---

Dave.

Thanks for that, order just placed. Still a bit concerned how or what caused the failure. Quite often I ride with my hand on the twistgrip, the roads here can be very rough with broken surfaces, cattle grids and speed humps such that I’ve lost three rear lights that have shaken loose from my saddle tool bag when riding at speed, could this place extra stress on the clamp?

Regards Id.

Prince of Darkness:
I think it is just like Dave said, it is deliberately engineered to be weak in order to prevent the risk of causing damage to lightweight carbon fibre or thin walled aluminium handlebars. Better a broken bracket than a catastrophic failure of the bar! :) If, like me, you fitted the shifter without using a torque wrench, it would be very easy to over tension the bracket. Of course, if you did use a torque wrench set to the appropriate force, then that does not apply ;)

High Moors Drifter:

--- Quote from: Prince of Darkness on August 25, 2018, 10:47:48 pm ---I think it is just like Dave said, it is deliberately engineered to be weak in order to prevent the risk of causing damage to lightweight carbon fibre or thin walled aluminium handlebars. Better a broken bracket than a catastrophic failure of the bar! :) If, like me, you fitted the shifter without using a torque wrench, it would be very easy to over tension the bracket. Of course, if you did use a torque wrench set to the appropriate force, then that does not apply ;)

--- End quote ---

The shifter was fitted by SJS and hasn’t been touched by me since purchasing the bike. I’m sure they fitted this correctly, I’m just keen to find out if my use of the bike contributed to the failure.


Id

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