Zipp's 303 S Carbon Tubeless disc brake wheels were designed to make you faster. The 303 S wheels were designed to be faster over all surfaces, gravel and road. The wider rim profile allows for wider tires and lower pressure, resulting in reduced rolling resistance. This creates a claimed 10 watts of saving. ?These wheels are only compatible with tubeless ready tires FEATURES: Optimized for 28mm tires, but capable of handling up to 50mm tires Wide 23mm internal width Note: Wheels are pre-taped and come with tubeless valves. SPECS: Max Recommended System Weight: 286lbs/114kg Max Tire Pressure: 73psi/5.0bar FRONT SPECS: Weight: 710g Rim Depth: 45mm Brake Type: Center-Lock Disc Brake Internal Width: 23mm Spoke Count: 24 REAR SPECS (XDR): Weight: 815g Cassette Compatibility: Sram XDR Rim Depth: 45mm Brake Type: Center-Lock Disc Brake Internal Width: 23mm Spoke Count: 24 REAR SPECS (SRAM/SHIMANO): Weight: 815g Cassette Compatibility: Shimano/Sram 11/10-Speed Rim Depth: 45mm Brake Type: Center-Lock Disc Brake Internal Width: 23mm Spoke Count: 24