Racing Spec 2.2 ULTRALIGHTA 25 mm feather lightweight carbon wheelset weights at 830g. Perfect for all climbing and KOM challenges. A true PB breaker! Racing Spec 3.2Its a 32 mm lightweight carbon wheel ideal for all hilly and mountain terrains. Instant response and quick acceleration, a perfect wheel to tackle any mountain top finish. Racing Spec 4.2A 45 mm well-balanced carbon wheel is ideal for mixed racing conditions. An all-around wheel, this super lightweight and yet stiff carbon structure wheels allows quick acceleration and fast in climbing. Racing Spec 5.2Provide excellent aerodynamic efficiency and construct with lightweight carbon structure, Racing Spec 5.2 is a well-balanced carbon wheelset ideal for hilly and sprinters’ stages. Racing Spec 7.2A 70 mm deep carbon wheel with ultimate aero efficiency is ideal for triathlon and time trial, lightweight carbon structure, durable and stiff.