303 SW Tubeless Disc A1Superior speed on all roads, no matter their surface. The 303 is Zipps do it all wheelset for road, gravel, cobbles, and cyclocross. Low drag and an improved transition between rim and tire, boosting aerodynamic efficiency with wider tires. Wide rim stance also features less tire deflection for reduced rolling resistance. The wider tire, increased tire volume, and lower tire pressure helps reduce rider fatigue by smoothing out the ride over imperfect