Accelero 40 Stealth is a light, strong clincher wheel with outstanding aerodynamic performance shaped by the same windtunnel studies as the mighty Mercurio tubular wheel. The structure of the aero rim (43 mm deep x 23 mm wide) is carbon-fiber, which is bonded to a 6000-series alloy tire bed / brake track extrusion. This means the rim is light, and braking is effective using standard brake blocks for alloy rims. The structural carbon-fiber rim is thicker where it mates with the alloy tire bed, conferring great strength where it's needed to locate the spokes. Standard Sapim CX-Ray spokes with alloy nipples (18 front, 24 rear) effectively sustain the high tension needed for a stiff, high-performance wheel. Accelero 40 Stealth is the ideal wheel for all-conditions use with the best clincher tires available today, and features our elegant Stealth finish in Matte Black. Separate versions for Campagnolo and Shimano/SRAM.