pete ewrote a review of Continental Grand Prix 4000 Tire on June 2, 2008
I've got these on 2 bikes and the GP 4000s on one bike. I can't tell too much of a difference with the 4000s vs these but either way these are the best tires. I've tried other brands but Continental is always going to have my business. Knock on wood these don't flat as easily as any other tires I've tried.