Hey, if anyone's in doubt, then I assure you Continental Grand Prix 4000 is the best tire you'll get. It's not without reason that so many people claim this is the tire that sets the standard for everyone else who's trying to make good tires.
The grip is absolute top notch, and whether it be dry or wet and slippery roads, you can relax and really trust this tire when speed is high and when you're going into sharp turns.
Far as I'm concerned it's very durable as well, so it lasts a long time.
Also, I always use these tires on my road bike and I can't even remember the last time I had a flat.
For me there's simply no other tire anymore; not for training and not for competitions.
Just a shame it's out of stock.. Hopefully new stock will come in soon and in various colors