Rode my cf bike on slick 23s yesterday in 0f wind chill. Finger tips got cold like usual, but otherwise it was a nice ride. This am there it was 20f with 10-15mph winds and 2-3 inches of fresh powder so I took the cross bike with 44c Conti Top Contact Winters...worked like a charm although the riding is slow and laborious. Still warmer than last year's regular dips down to -15f.