Originally Posted by Sekt
A lot of people seem to recommend you avoid adjustable wrenches on your bike. You often need to torque down pretty damn tight, and they can make it easy to round a nut.
If you know how to use an adjustable wrench, you shouldn't be rounding nuts.
I ride a variety of bikes (American, European, Asian) and always keep mine with me, just to avoid having to repack a toolkit for every bike, or carry two sets of wrenches all the time... never had a problem with rounded threads or not enough tension.