ruote vision trimax 30 kb rim brakeThe Trimax 30 KB wheels feature a 30 mm high and 19 mm wide rim. Thanks to the P. R. A. system on the hubs and aerodynamic spokes, you are ready for a smooth ride, both on flat terrain and hills. FEATURES Aluminum rim 30 mm profile 19 mm internal channel P. R. A. hub with DP spokes 6 sealed bearings (2F + 4R) Self locking ABS nipples Handcrafted construction, entirely handmade 2: 1 aerodynamic spokes 16F 21R Compatible with SHIMANO, SRAM, and