The Zipp 303 XPLR SW is big enough for your biggest gravel goals. Just how big? This wheelset is the fastest on gravel, thanks to its mega-wide rim that integrates seamlessly with approved gravel racing tires.* Most gravel wheels are modified versions of existing road wheels, focusing on stiffness and lightweight. Zipp takes a different approach. 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 SW is built big, it's still lightweight to keep you fast and fresh for those long, fulfilling days in the saddle. The Zipp 303 XPLR SW is compatible only with approved tires.Features:- Fastest race wheel on gravel, 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- ZR1 DB hub is engineered in Germany with better seal design for improved durability and quicker response with 66 points of engagement- Center locking rotor interface. Lockring is included with the wheels.- XDR or SRAM/Shimano driver bodies- 303 XPLR SW IS ONLY COMPATIBLE WITH APPROVED TIRES. The Goodyear XPLR Slick and Goodyear XPLR Inter are specifically designed and optimized for the 303 XPLR SW.Specifications:- Orientation (wheels): Rear- Size (wheels): 700c- Rim construction: Carbon Hookless- Tire compatibility: Tubeless tires only- Rim depth: 54mm- Surface texture: ABLC Dimples- Brake compatibility: Disc (Center Lock)- Rim inside width: 32mm- Rim profile: Symmetrical- Rim finish: UD fiber, Impress valve graphic, adhesive decals- Nipple material: Aluminum- Nipple anti-rotation: Sapim Secure-Loc- Spoke type: CX-Ray - Spoke count: 24- Spoke pattern: 2 Cross- Hub: ZR1 Disc Brake- Driver body type: SRAM/Shimano Road- Axle type (Wheels): TA 12x142- Driver body material: Aluminum- Axle material: Aluminum front & rear- Bearings: Cartridge Carbon Steel- Max tire pressure: 50psi/3.45bar- Max recommended system weight: 286lbs/130kg- Max outside width: 40mm- Weight (g): 1452