Top choice for ambitious All Mountain and Enduro riders: Vittoria' s asymmetric 28 mm WSR profile rim securely supports even the biggest tires; Vittoria AP hub has 28 butted, straight pull spokes, Center lock(R) disc mount (convertible to 6-bolt) and proven hub internals. Patented Speedlock(R) rim-bed profile securely supports tubeless tires even at low pressure.