Originally Posted by
killa
I've personally never seen a stem/bar combo lower than 4Nm. I've built a fair few bikes in my time, never broke anything. 4 and 5Nm is nothing much, the bars must have either been faulty or poor quality, or you didn't tighten the 4 bolts in a cross configuration.
No, I was pretty careful about cross tightening them. You're right that one doesn't see a lower recommendation. Nevertheless, the Kestrel PRO SL bars only weigh about 180g, so it makes sense they are fairly delicate. Thing is at 2 Nm they are really tight. I do believe that home mechanics misinterpret torque specs to mean tighten that much rather than never tighten more than that. The latter makes more sense to me. I will say this: when I am using a torque wrench and tightening up to the "recommendation", the result is ALWAYS tighter than I would have done by hand. I would have always stopped (and always did with aluminum parts) before the recommended torque is reached, sometimes way before.