Zipp 303 S Tubeless Disc Brake Carbon Rear Wheel - SRAM XDR

The Zipp 303 S Tubeless Disc Brake Carbon Rear Wheel is a 45mm-deep hookless carbon rear wheel for disc-brake road, all-road, and gravel bikes running tubeless tires. It is sold as a single rear wheel with a SRAM XDR driver body, so it is built for riders on SRAM XDR cassettes who want carbon depth and a wide modern rim profile without moving into deep-section race wheel territory.

The defining number here is the 23mm internal rim width. Zipp designed the 303 S around wider tires at lower pressure — the rim is fastest with a 28mm tire and still accepts wide gravel tires — which produces a larger contact patch, a more compliant ride, and less rolling resistance on rough pavement than a narrow rim running high pressure. The hookless bead creates a smoother tire-to-rim transition for aerodynamic gain, and the symmetrical 45mm profile keeps handling predictable in crosswinds relative to deeper rims. Claimed weight is 819g.

Who It's For

• Riders on SRAM XDR cassettes — this is the XDR driver version, not HG
• Road and all-road riders who want carbon aero depth with real tire clearance, up to wide gravel tires
• Riders replacing a damaged rear wheel or upgrading one wheel at a time
• Riders committed to tubeless setup
• Consider something else if: you run Shimano/SRAM HG cassettes (the HG driver version applies), you want to run tubes or hooked rims, you need tire pressure above 73psi, or your rider-plus-bike-plus-gear total exceeds the 250lb / 114kg maximum system weight

What to Look For

• Confirm your driver body before ordering. XDR and HG are not interchangeable — the cassette you own decides which version of this wheel you need.
• Hookless rims set hard limits. Tubeless tires only, hookless-compatible tires only, and a 73psi ceiling. If your current tires or pressure habits do not fit that, budget for new tires.
• Match tire width to intent. 28mm is the fast setting on this rim; wider tires trade some speed for grip and comfort on gravel and rough roads.

Key Features

Rim: 45mm-deep hookless carbon with a 23mm internal width and 28mm maximum outside width, in a symmetrical profile. The depth adds aerodynamic benefit at speed while staying manageable in wind, and the internal width lets a 28mm tire sit at its intended shape rather than being pinched narrow.

Hub and driver: Zipp 76D/176D hub set with steel cartridge bearings and a SRAM XDR driver. Straightforward, serviceable hardware — bearings are replaceable rather than proprietary sealed units.

Brake interface: Center Lock disc. Rotor installation is faster than 6-bolt and requires the correct lockring tool.

Tire compatibility: 700c, tubeless only, hookless. Lower pressures and larger air volume are where this wheel earns its performance, so tire choice matters more than it would on a hooked rim.

Finish and build detail: UD fiber with bake-on labels under a matte clear coat. Spoke lengths are 264/266mm drive side and 266/268mm non-drive side — worth noting if you service your own wheels.

Rider Intent Summary

• Biggest strengths: Wide 23mm internal hookless rim at 45mm depth, 819g claimed weight, and a serviceable Center Lock hub — carbon aero performance at an accessible tier.
• Tradeoffs: Tubeless-only, 73psi maximum, 250lb system weight limit, and driver-body-specific.
• What makes it different: It is tuned to be fastest at 28mm rather than at a narrow race tire, and it still clears wide gravel tires on the same rim.

Victory's Take

At Victory Bicycle Studio we recommend the 303 S to riders who want one carbon wheelset that handles fast group rides and rough back roads without swapping wheels — just confirm your cassette type and tire compatibility with us first, because the hookless spec is the part riders most often get wrong.

Specifications

• Size - 700c
• Rim construction - Carbon – Hookless
• Tire compatibility - Tubeless tires only
• Rim depth - 45mm
• Brake compatibility - Disc (Center Lock)
• Rim - inside width - 23mm
• Rim profile - Symmetrical
• Rim finish - UD fiber / Bake-On labels / Matte clear coat
• Hub - 176D, 76D
• Driver body type - SRAM XDR
• Bearings - Cartridge - Steel
• Max tire pressure - 73psi
• Max recommended system weight - 250lbs/114kg
• Spoke Length DS - 264mm, 266mm
• Spoke Length NDS - 266mm, 268mm
• Max outside width - 28mm
• Weight - 819g (approximated weight)