I actually use two torque wrenches on my bicycle with Craftsman Hex Sockets. The first is a smaller 3/8" drive that is set in in*lbs for the light stuff. I use my 1/2" that I had laying around when working on the car to torque my FSA self extracting bolt that I was surprised that it needed up to 55N*m. So it easily accommodated that job. In general though, a good 1/4" and 3/8" is plenty for any job on a bike given it is rated to the proper torque range for the job.

Perfect for bikes!