Just swapped out my stock 1.95 nobbies on my MTB with some Geax Street Runners @ 1.25. Wow.....huge difference. The tires are amazing, quiet, very fast and smooth. Now my MTB is probably as close to a road bike as it can get as far as speed goes. I think I picked up about 4 mph on an average over the course of a ride and got about 3-4 mph on my max pedaling flat ground speed.

Makes me wonder what a road bike would be like.........