I just switched tires on my new commuter from Innova Ice Huskies over to Schwalbe Snow Studs. It made a huge difference in rolling resistance between the two. But one thing was that the Innova's were 2.1's that fit my old mountain bike and the Schwalbe is 1.9 which are the new bike OEM tire size. There may be difference in width but I am running the same pressure with both types of tires.