Schwalbe Marathon 26 x 1.75" tire was replaced at about 6000 miles with still use able tread and no flats. Replacement Schwalbe Marathon Supreme tires in 26 x 2" are currently at about 4000 miles and going strong. Again no flats. The Supreme model is MUCH lighter and the bike spins up to speed a lot quicker. This was on my Raleigh M60 rigid mountain conversion which is currently awaiting a new cartridge bottom bracket, rear cassette and chain.

Current ride (Jamis Aurora) came with Vittoria Randonneur tires and the back one had no tread in spots after about 1800 miles. Front was still okay. They where replaced with a set of Marathon Supreme tires which currently have about 400 miles on them.