-
Rear track nuts slip under the force of pedalling all the time. Over the last few years I've cracked a few steel components including crank arms, chains and a seatstay. Not to mention the stuff I see come into my worshop..
You probably wouldn't notice a quick release slipping because the wheel axle should already be sitting snug in the top of the dropout already. Quick releases in vertical dropouts often suffer from slippage after a while.
psg1ben-
okay point taken, they may slip after a while. But enough force to cause the nut to slip and then destroy a bb so completely the wheel falls into the dropout? For me personally it's a risk i would be willing to take (and have taken). Although maybe I wouldn't be so brazen if i'd ever cracked a competent. I'm sure someone with a better working knowledge of these things would have a more objective opinion.
tbs
You may be right, i just can't picture a ball bearing ever cracking. Also there won't even be any real force on the bb unless the thing holding the wheel in place slips which I've never experienced even with a quick release, never mind a track nut!