Without having any specific knowledge of that, I'd venture an educated guess that disc brakes piss all over rim brakes in every respect, particularly in wet weather performance. What's 'adequate' performance? If you bike stops 3' BEFORE you hit the car, it's 'adequlate'. If it doesn't you're DEAD. So I would imagine the big reason that disc brakes aren't on road bikes yet are:

• The overwhelming weight weenie factor that permeates roadies

• That in 95% of roadie braking scenarios, rim brakes ARE adequate

• Yes it does complicate things quite a bit in a couple of areas, so maybe it's deemed too much of a hassle for a braking benefit that would only be apparent in relatively rare situations in the real world. Of course that's the situation that might kill you if your rim brakes don't stop your sorry ass in time, but that's the way it goes.

It's that last 5% that concerns me, mainly in wet weather conditions. I will admit this:

• I don't have special wet weather brake pads (and probalby never will).

• Mainly in large part because I try NOT to ride in the rain and on wet roads, although sometimes it's unavoidable, and every roadie I know does the same.

So we're not riding on wet roads much anyway, are we? But I can assure all these clueless comments about rim brakes being as good as disc brakes that there's NOT A FRIGGIN CHANCE this is the case. I wonder why motorcycles and cars don't have rim brakes? Don't kid yourself. There may be reasons why rim brakes still predominate on road bikes, but their awesome stopping power isn't one of them.