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Jaap
youramericanlover
Depends on the tyres I guess - my understanding suggests slicks like Gravel Kings or Horizons aren't a problem, might not be as fast as GP4kSII but certainly fine on the road. The knobblier you get I think the slower you're going to roll, but if you're on tarmac, racing against a clock I guess you're not going to be taking your gravel bike.
Anecdote time! My 650B 42c Gravel Kings run fast as hell. Can hold decent laps speed on them. My 700c 40c Nanos are heavier and roll slower on tarmac but still go fairly well when you chug up to speed.