Disc brake wheels have fundamentally changed what's possible with rim depth, freeing designers from the heat management concerns that once limited carbon brake tracks. Zipp's 303 S Carbon Tubeless Disc takes full advantage of that freedom, pairing a 45mm-deep rim with a 25mm internal width that accommodates the wider tires modern road cyclists actually want to run. The profile splits the difference between climbing wheels and aero setups, giving you enough depth to matter at speed without the handling penalties of deeper sections in crosswinds.

The 303 S represents Zipp's approach to bringing their wind tunnel research to a broader audience. The rim shape derives from their Sawtooth dimple technology, which manages airflow across the rim surface to reduce drag and improve stability when winds hit at an angle. That aerodynamic work matters most in real-world conditions where wind rarely arrives head-on. The hookless bead design pairs with tubeless-ready construction, and Zipp rates the rim for tires between 28mm and 50mm—a range that covers everything from fast road rubber to light gravel duty.

The wheelset ships configured for SRAM/Shimano 11-speed freehub compatibility, with XDR driver bodies available separately for SRAM 12-speed drivetrains. Zipp uses their ZR1 hubset with sealed cartridge bearings and a quick-engaging freehub mechanism. Center Lock rotor mounting accommodates standard six-bolt rotors with an adapter if you're transitioning from another wheel system. The hub spacing follows the 12x100mm front and 12x142mm rear thru-axle standard that's become universal on disc brake road frames.... Read More