I'm perfectly happy with the 160mm Avid Roundagons that came stock on my bike. We haven't had a lot of wet since I bought it, but it is true that there's no difference in braking with the discs, excepting, of course, tire traction on the road, which ultimately is the limiting factor in stopping power. Although I am much less prone to locking-up the wheels with the discs. The feel and modulation are that much better.

Two weeks ago I took the bike on a century that included lots of climbing, and thus, lots of long, screaming descents. Even a five-mile descent which peaked at 46.8 MPH was completely undramatic as regards the brakes.

BTW, this is with a 23 pound road bike and 170 pound rider and a typical unsupported century ride's worth of water, snacks and gear.

As for the rotor prices you quote, there's really no need to drop trou and reach for your ankles when buying rotors. I use BikeStop in Colorado for many of my component purchases. They have Avid Roundagon rotors for $22, $25 and $29 in 160mm, 185mm and 203mm sizes respectively.

They have other brands ranging from $15 for a 160mm Tekro, to $68 for a Hope, two-piece floating rotor. Not sure why two-pieces are needed or why one needs to float. Or if a $68 rotor stops better than a $15 one. But I went to discs because rotors wear longer and are cheaper to replace than rims. I see no point in buying rotors that cost more than rims, (albeit even these high-priced ones are still less than wheelsets.)

Linky: http://stores.ebikestop.com/Store/Ca...=2&catid=13826