Quote:
Originally Posted by Mark McM
Cranks are subject to high magnitude fully reversed loading, so all crank bolts need to be tightened to the appropriate torque, and that is best done with a torque wrench. This includes square taper, Octa-link, Isis, HollowTech II, GXP, BB30/BB86, Dub, etc. A home mechanic might be able to get away with not using a torque wrench (at least some of the time), but any professional mechanic worth their salt will use a torque wrench.
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When someone says they have never had issues with the big items you are mentioning (BB, Crank, Rings, Cassette) and torque wrenches are only for the delicate things they are just telegraphing how hard they ride or that they're a smaller rider.
IME you ride hard, any one of those things will quickly become a problem if it was not done 100% correctly.
As long as you don't break the delicate things they are not likely to come loose.