Originally Posted by
merlinextraligh
If torque wrenches are so necessary to work on a bicycle, why don't professional mechanics use them?
My guess is that's because of their long experience as mechanics, where they have gained a pretty darned good sense of the appropriate torque required for different parts. I'd bet that 95% of shade-tree mechanics (like me) never gain enough experience for that to happen. A torque wrench eliminates the guessing.