The Fulcrum Racing Speed 40C provides pro-level performance with a clincher tyre. Brimming with Fulcrums top performance innovations, the Racing Speed 40C's are a dominant combination of light, stiff, smooth and aerodynamic. Gorgeous and high strength 3K carbon fibre weave is used for the 40mm deep rims on these wheels, with a high transition grade resin (HTG) and Fulcrum's 3Diamant technology used for the braking surface. Fulcrum's 3Diamant finishing uses a diamond tipped tool to eliminate any resin imperfections on the braking surface revealing a surface of just woven carbon fibres for the brakes to work on. The HTG resin diminishes the chance of overheating the braking track. The Racing Speed 40C's braking surface delivers excellent performance in both dry and wet conditions, providing smooth and safe braking at all times. The rim bed is un-drilled thanks to Fulcrum's MoMag technology which produces a uniform rim without any spoke holes, which is stronger and doesn't require rim tape, reducing weight and aiding convenience. The Racing Speed 40C's spoke nipples are placed in the sealed rim via the hole for the valve stem and are then guided into place using an external magnet. All this technology makes the Speed 40C a very strong and stiff wheel, apt for racing performance on sometimes tough and unforgiving British roads.
Rims are only one factor in the strength of a wheel and the Racing Speed 40C's benefit from all of Fulcrum's wisdom regarding spokes. Fulcrum's DRSC spoke and rim coupling system helps the Racing Speed 40C's double butted stainless steel spokes to dissipate severe torsional forces and maintain equal and optimal tensioning. Fulcrum's engineers have designed exclusive spoke housings for their hubs, ensuring that the spokes will never lose their initial tension, boosting the wheels longevity considerably and keeping the spokes optimal aerodynamic position too. The rear wheel has a two to one spoke ratio, with 14 spokes on the drive side and 7 on the non-drive side. This enhances power transfer and longevity, supporting the extra torsional forces that pass through the the drive side of a wheel. For these same reasons the flange on the drive side of the rear hub is oversized.
The Racing Speed 40C's glossy front carbon hub doesn't just look fantastic, it saves weight and increases stiffness. The Speed 40C's hubs house Fulcrum's brilliant ultra-smooth bearing system (USB), with ceramic cup and cone bearings, for wonderfully smooth riding. Ceramic bearings are also lighter and require less maintenance. The aluminium freehub is plasma treated to significantly improve its durability, allowing the aluminium to be thinner for a reduction in weight. The Racing Speed 40C's are exceptional wheels, perfect for flying along in the high MPH. Their lightness and stiffness enables you to spin-up fast and reach higher speeds whilst the smoothness and aerodynamic profile of the wheels will help you maintain higher speeds once you reach them. These subtle stunners evoke a sense of mystery as you glide past fellow riders, who wonder where you're getting all your speed from.