I like how people at my shop refuse to use the torque wrench on say for example Truvative crankarms. Then the customer buys the bike, comes back in with it a week or so later with the bike in on hand, and the crank that fell off in the other. Then I have to deal with calling Truvative all the time for replacements beause the crank/BB interface is now all screwed up. So, no, you don't need to use one.