Shimano Pair. Aluminium milled rims: With intergrated dynamic balancing for weight saving and greater stability at high speed Two-way fit rims: For tubeless and clincher compatibility, with differentiated front/rear rim profile USB ceramic bearings: For lower friction, lower power loss, corrosion-proof and longer service life Aluminium spokes and nipples: For weight saving Aluminium/carbon hubs with oversized flanges: for weight saving, lightness and stiffness Technical spec: Rim height: front 24mm / rear 30mm (black) Spokes: front 16 aluminium bladed / rear G3 7x3 aluminium bladed (black) Hubs: Carbon/Alloy (black) Weight: 1440g pr