Hi trapjaw,

I currently ride a pair of michelin 'rock thread tyres' they are 1.75's. They are rated to 80psi but I'm older now and I ride them between 60 & 65. They roll ok and have good wet performance. The compound is a bit soft though and won't stand up to even minor locking of the wheels.
The best semi's I ever had were a pair of IRC's. They were rated to 95, I ran them at 105. They were bald in the middle and had inverted thread on the sides. That made for one hell of a fast ride. The only complaint was that fast cornering in the wet was sometimes a tad hairy. Also after one season bulges appeared in the side walls and I had to throw them, but that was probably due to me over-inflating them and also a harsh winter. They were 26X1.5's by the way.

Happy hunting.
P.s.
Michael, I never knew fatter tyres had a lower roll resistance. Can you explain this with a bit more detail?
Interesting