Thanks to Zipp's Total System Efficiency (TSE) carbon laminate and design, the Super-9 is engineered for a new era of wider tires and lower tire pressure in TT and triathlon. Combining Zipp's wheel laminate with a wider rim profile and optimized tire interface helps you overcome the four barriers to speed: wind resistance, gravity, rolling resistance, and vibration losses. The Super-9 is fastest with 28mm tubeless tires inflated to lower than traditional pressure. To ensure proper inflation, the Super-9 comes with the TyreWiz 2.0 tire-pressure monitor integrated out of sight and perfectly balanced so you'll always know if you're in your desired PSI/bar range. Inflation is a breeze with redesigned pump access. Moreover, the disc features a redesigned pump-access port-no stickers needed. The Super-9 features the premium ZR1 hub with ceramic bearings and 66 points of engagement.23mm internal rim width28mm minimum and optimal tire size recommendedIntegrated TyreWiz 2.0 tire pressure monitor and redesigned pump access coverLow drag ceramic bearings for race day performanceIncludes pumpchuck adapter and Zipp wheel bagAero, durable, light weightTubeless compatibility for optimization of wider tires with lower tire pressure, lower rolling resistance, and increase grip and complianceGreater stopping power and modulation of disc brakesItem SpecificationsCassette Body TypeShimano HG 11/12-Speed RoadDefined ColorBlackHub/Brake CompatibilityCenter-Lock DiscISO Diameter622 / Road / 29"Rear Axle12mm Thru x 142mmRim MaterialCarbonRim Width (Internal)23Tire TypeTubeless ReadyValvePrestaWheel Size700c Zipp Super-9 Disc Rear Wheel Rear Wheel UPC: 710845901324