Yesterday I fitted my first BB and Cranks (wife's bike) and want to make sure of torque before I send her out on it. (Must check insurance lol) Searched through the forums and web and read lots of interesting info on torque. I have a very old and huge torque wrench but I don't trust it as it hasn't been used for 30 years and it only goes up to 20 Nm anyway. Torque wrenches for bikes seem massively expensive. There's a Draper on Amazon that covers 10 - 60 Nm for about £25. The general opinion seems to be to not bother with one unless you have carbon. I don't. The torque on the BB (Shimano M590) range starts I think at 35. In foot pounds that's about 29. if I have it right in my head that means a foot long spanner with 29 lbs of weight on the end. Still hard to visualize. I'm a heavy bloke at 213lbs. I figure put a big wrench in my hand and there's more danger of stripping the threads and ruining the frame than leaving loose. I've done it so that I didn't have to strain or use "gorilla force" as Sheldon puts it, but it definitely feels good and tight. any guidance ? because of the different threading will it self tighten anyway?