Hello everyone.
Does anyone know the torque values for Shimano PRO Vibe Aero Alloy Handlebar PRO Vibe Aero Alloy Handlebar ? I couldn’t not find this information on their website and in their pdf catalogs but I heard that dealers have access to the internal portal with more information. So, I’m hoping someone can share this info.
Also, if the torque guideline is non-existent for this handlebar, is it safe to torque it up to the value mentioned on my stem(which is 6nm)? What are the chances of overtorquing it, and if it breaks, what’s the nature of the failure from overtorquing - is it gradual deformation or a catastrophic failure?
Thank you.
Handlebars don’t have torque values because there are no bolts to spec a value for.
Follow the torque specs on the stem you use.
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Currently using that exact bar in 380mm width, mated to a Zipp Service Course SL stem (90mm). Torqued all bolts to 5 Nm, with zero issues. Have used it for nigh on 2 years.
I weigh 65 kgs (245 lbs).
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That is not always true, especially with lighter weight parts. Many of my handlebars have maximum torque values (as low as 2Nm on some FSA bars where they really don’t want you to clamp anything but a computer mount next to the stem).
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I would expect the max torque value to be 5 Nm. But handlebars can still crack. I have had that happen once with carbon handlebars. The stem had 5 Nm printed on it. When I told with the owner of my then-LBS (who immediately eyeballed the crack out of the corner of his eye and confirmed it with a tap test), he simply responded “Is it broken or not?”
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It’s weird for bars to have a torque rating printed on them. It’s common but it’s still weird. The bar manufacturer knows the strength of the bar but can only guess what the thread pitch and clamp configuration would be on an attachment so it is really a guess.
OP did not ask in the abstract though. Pro Alloy bars are quite robust and the stem torque setting is appropriate here.
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