It almost feels like cheating the foldable bead and light weight materials allow tricks to flow so much easier without the extra weight to throw around high pressure and dual compound tread make landings stick at any angle maxxis used these technologies and more to produce the grifter simply the best freestyle tyre ever light weight freestyle tire dual compound technology foldable bead 110 psi high air pressure rated sizes 20 x 185 or 21 tpi 120 bead foldable max p