If perfection is the standard, then the 303 Firecrest Carbon Clincher wheelset delivers everything you could ask for, including a heritage forged in the Spring Classics. At the center of the 303 Firecrest Carbon Clincher is the 77/177 hubset, an innovation that results in improved aero performance, stiffness, braking, durability, simplicity and versatility. The 303 Firecrest is light enough to climb up the steepest gradients with ease as a go-to all-around wheelset. Key Features New, faster, more stable rim profile - AeroBalance™ ABLC SawTooth™ dimples pattern Showstopper™ brake track Improved 45mm rim profile - fast, stable and versatile ABLC Sawtooth dimple design helps manage air flow around the rim, and contributes to create a faster, more stable wheel. Industry leading Showstopper brake track: powerful and consistent braking, even on the wet. 77/177 hubset, reliable & durable, proven in the Spring Classics. No pre-load adjustment required. XDR driver body available for 1x setups ISO 4210 compliant. See Declaration of Conformity for details.