Groasters

I ride gravel/trails with a few CX racers that use 33c and they manage better than most riders on 42+. They reckon in muddy conditions (common here in Scotland!) their narrower tyres cut through to the grippier surface below the mud better than on wider rubber. Same in autumn (fall) where carpets of leaves on the forest trails are harder to navigate on wider tyres than on say 33c CX tyres.