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Road discs can get away with being smaller as they cool via faster airflow.
The reservation I have is the impact on fork design. Headtubes have got plenty stiff enough, but fork blades are going to change. Are stiff forks going to ride well? Or are we going to have put up with bikes stepping out to the right under heavy braking?
miro_o
@ghettro
A skinny 23mm front tyre is very difficult to skid on smooth dry asphalt on a typical road bike, the bike will overturn first. Like others have said, discs actually have better modulation so you're really less likely to skid.
Having said that I think the current crop of road discs are a little undersized, a lot of them have 140mm rotors even. The amount of heat generated down a hair-pinned 20km alpine descent is not something a typical disc braked MTB rider would encounter, yet they normally sport 200mm rotors on downhill MTB's.
But yes, I'm running TRP Spyres on my Genesis Croix, and absolutely love them. Reliable, controlled braking in all weather. Ideally I'd run hydraulics however circumstances didn't allow it.