Vittoria Diamante Pro IV Road Tire. The Vittoria Diamante Pro IV Road Cycling tires are the kind of thing road racers dream about. We're talking an elite racing with Vittoria's advanced, light, and supple 220 TPI Nylon Plus casing. Plus, this tire is not only light, but has all the efficiency you want out of a slick tire, but with some amazing tread technology and ISO grip compound so you don't have to flinch cornering even in weather. Add in bead to bead flat protection and you can worry about other stuff on race day like slaying the competition.