There are no compromises on race day, and Profile Design knew that when they designed their 78/TwentyFour carbon tubular wheels. The 78mm-deep and 24.5mm-wide rim and super stiff carbon layup provide uncompromising go-fast performance. And, the aero shape of the rim slips easily through the breeze, increasing your efficiency and speed. Match these rims up with your favorite tubular tires (sold separately) and experience the high-traction cornering and supple road feel you need to ride to believe. The hubs feature sealed bearings for high-mileage durability and the freehub body is Shimano/SRAM 9, 10, and 11-speed compatible so you can use the drivetrain of your choice.