Join Date: Jul 2007
Location: Anaheim, CA, USA
I didn't reply at first because the question is difficult to answer. There is a simple tradeoff between tire lifetime and grip. Soft, grippy tires don't last long. Hard, not-so-grippy tires last a long time, but tend to slip on the road turing turns. Some sport-touring tires have dual compounds, with harder rubber in the center of the tire, and softer, grippier compounds on the sides, to better grab the road when you're leaned over.
A popular hard tire for the longest wear is probably the Metzler ME 880 tire. They are very hard. They are not very grippy.
Riding style and load have a lot to do with tire wear. I get well over 10,000 miles on Michelin PR2s, PR3s, and PR4s, but I have a relaxed riding style. A friend of mine is a very aggressive rider, and he wears out tires in half the miles that I do.
If you want the hardest tire that lasts the longest with poor grip: Metzler ME 880. If you want a tire with good overall riding properties and reasonable wear: Michelin Pilot Road 4 (PR4).