The Zipp 303 XPLR S is big upgrade for gravel riders without a big price tag. This wheelset borrows key innovations from our premium wide gravel wheelset, it is affordable and robust for discerning gravel riders. This wheelset is the fastest on gravel, thanks to its mega-wide rim that integrates seamlessly with approved gravel racing tires.* In gravel, resistance and vibrations from bumpy surfaces create a barrier that slows riders down. To combat this, Zipp applied Total System Efficiency specifically to the challenges of gravel. The wide profile increases air volume, allowing for lower tire pressures without squirm. That means you mitigate surface vibrations while maintaining grip when cornering or traction while climbing. The rim profile also creates a seamless transition with gravel tires for unsurpassed aero efficiency on gravel. And while the 303 XPLR S is built big, it's light to keep you fast and fresh for those long, fulfilling days in the saddle. The Zipp 303 XPLR S is compatible only with approved tires.Features:- 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- Applies Zipp's Total System Efficiency to high-performance gravel- 76 / 176 DB hubs with Center locking interface XDR or SRAM/Shimano driver bodies- 303 XPLR S IS ONLY COMPATIBLE WITH APPROVED TIRES. The Goodyear XPLR Slick and Goodyear XPLR Inter are specifically designed and optimized for the 303 XPLR S.Specifications:- Orientation (wheels): Rear- Size (wheels): 700c- Rim construction: Carbon Hookless- Tire compatibility: Tubeless tires only- Rim depth: 54mm- Surface texture: Smooth- Brake compatibility: Disc (Center Lock)- Rim inside width: 32mm- Rim profile: Symmetrical- Rim finish: UD fiber, adhesive decals- Nipple material: Brass- Nipple anti-rotation: Sapim Secure-Loc- Spoke type: CX-Sprint- Spoke count: 24- Spoke pattern: 2 Cross- Hub: 176D- Driver body type: SRAM/Shimano Road- Axle type (Wheels): TA 12x142- Axle material: Aluminum front & rear- Bearings: Cartridge Stainless Steel- Driver body material: Aluminum- Max tire pressure: 50psi/3.45bar- Max recommended system weight: 286lbs/130kg- Max outside width: 40mm- Weight (g): 1610