Product Info SRAM Model ID: WH-303-XPS-A1 Fast and robust gravel wheel, features tubeless and hookless rim profile Ultra-wide internal profile for decreased rolling resistance, ability to run pressures under 30psi (2.1 bars) Wide and deep profile integrates seamlessly with gravel tires to increase aerodynamic efficiency 76 / 176 DB hubs with Center locking interface Max tire pressure 50 psi/3.45 bar Lifetime Warranty COMPATIBLE ONLY WITH APPROVED TIRES. See Zipp.com for list.