That's a Dunlop Sport 5000SP 'H' rated
Here's the 255 on Tire Rack (I forgot they were that expensive!!!)
http://www.tirerack.com/tires/tires....00V2&tab=Sizes
And other sizes.
http://www.tirerack.com/tires/tires....P+Sport+5000+M
It's a great tire for looks and traction but so far, very few miles, but on my 2500+/- pound car, should last for a long time as long as you don't smoke 'em at every start