Michelin Mountain A.T.! I've been running this tyre (along with a Hutchinson Air light front Tyre - just 550g!) for little over a month on both Street and Natural. This tyre offer's alot of grip on all obstacles, especially, I've found with Sidehops and Taps. It also weighs just 999g which is an added bonus! With it being dual ply, it also combats against pinch flats. I haven't had a puncture yet. They're available here!. Adam@TheMontyShop is a nice guy, he'll probs throw in some tar and stickers! You'll get your order next day too. Hope this helps