Typical fastener torque values for bicycles I'm thinking of getting a torque wrench (or something similar) for working on bikes. The ones I have for cars are pretty ungainly and I think I'd be at the low end of the range where they aren't too accurate most of the time.

So, does anybody know – or have ideas for how to find out – the range of torque values one would want to have covered? Also, how precise does the tool need to be? Wiha has some screwdriver &amp; t-handle tools that are spec'd at ±6%. Is that close enough?
I have 2 torque wrenches. One that goes up to 20Nm and another that goes from 20-60(ish)Nm. The little one is necessary for most of the things on my bike like my headset bolts and hollowtech crank bolts (around 7Nm and 14 NM from memory) and the big one is mainly for the cassette (40Nm) and bottom bracket (can't remember) and (just quietly) undoing stuck things (it's my longest spanner, so if I can't undo it with that I need to go get some pipe). 

Unless you're doing super precise stuff with them a lot you'll probably be okay with cheap ones. I got mine when they were on special at Aldi, and probably use them less than once a month, but it's good to have them when you need them. I balked at the cost originally, until I ruined a set of cranks by over-torque-ing the bolts, which cost me quite a bit more than if I'd just got a torque wrench in the first place).