.z404 { font-family: inherit; font-size: inherit; line-height: 1.6; color: inherit; } .z404 h4 { font-size: 16px; font-weight: 700; margin: 28px 0 8px; border-bottom: 1px solid #e0e0e0; padding-bottom: 4px; } .z404 p { margin: 0 0 12px; } .z404 a { color: #0055cc; } .z404 .note { font-style: italic; font-size: 13px; color: #555; } .z404 .section-divider { border: none; border-top: 1px solid #e5e5e5; margin: 32px 0; } /* Spec + pressure tables — fixed 160px first column (desktop) */ .z404 table { width: 100%; border-collapse: collapse; font-size: 14px; margin: 4px 0 12px; } .z404 table td { padding: 6px 0; vertical-align: top; } .z404 table td:first-child { width: 160px; color: #555; padding-right: 16px; } .z404 .pressure-table td:last-child { font-weight: 600; white-space: nowrap; } /* Mobile: stack each row (label over value) so columns don't collide */ @media (max-width: 600px) { .z404 table, .z404 table tbody, .z404 table tr, .z404 table td { display: block; width: 100%; } .z404 table tr { padding: 8px 0; border-bottom: 1px solid #eee; } .z404 table tr:last-child { border-bottom: none; } .z404 table td { padding: 0; } .z404 table td:first-child { width: auto; color: #555; font-size: 13px; margin-bottom: 2px; padding-right: 0; } .z404 table td:last-child { font-weight: 600; } } The Zipp 404 S was built from a blank sheet with one goal: deliver the fastest road wheel Zipp could engineer at the most accessible price in the lineup. It builds directly on the groundwork of the 303 S, then beats it in every way that matters on pavement — aerodynamics, hub performance, looks, and price. With the 404 S joining the family, Zipp's S Collection now covers road (404 S), gravel (303 XPLR S), and XC (1ZERO HITOP S) — all best-in-class at their price. This is the road one. Unrivaled Aero At 50mm deep , the 404 S runs a mid-depth rim profile borrowed from Zipp's WorldTour-proven Firecrest design — premium-level aerodynamics that stay shallow enough to keep you composed in crosswinds. It saves around 2 watts over the 303 S, and shows similar savings against competitor wheels that cost well over twice as much. Pro-tier speed, S-Collection sticker. Engage Instantly Power gets to the road through the proven Zipp 76/176 hubset with 36 points of engagement — quick, confident pickup every time you stomp on it. Laced 20-hole front and 24-hole rear in a 2-cross pattern with Sapim CX-Sprint spokes on sealed cartridge bearings, the whole set tips the scales at just 1585 grams (valves and tubeless tape included). Wide Bed, Low Pressure, More Speed The 23mm internal width TSS (hookless) rim is designed around modern road rubber, taking 28–39mm tires and letting you run them at lower pressures for less rolling resistance and more control on whatever the road throws at you. Set up tubeless or run tubes with a hookless-compatible tire — your call. Your Wheels, Your Look Pick your aesthetic: White decals — the same finish found on Zipp's pro-team wheels — or understated Dark Grey for a cleaner, classic profile. Decals are applied, not painted, and can be removed if you want to go stealth. DEFAULT COLOR IS DARK GREY Backed for Life Like every Zipp wheel, the 404 S carries an industry-leading Lifetime Warranty and Crash Replacement policy. Ride it hard, ride it confident — Zipp's rider support has your back. Specifications Rim Depth 50mm Rim Material Carbon Internal Width 23mm External Width 29mm Rim Type TSS (Hookless) Tubeless — ISO compliant Hubset Zipp 76/176, Center Lock disc Engagement 36 points (10°) Driver Body SRAM XDR Bearings Sealed cartridge Spokes Sapim CX-Sprint Lacing 20H front / 24H rear, 2-cross Axles 12x100mm front / 12x142mm rear Tire Compatibility 28–39mm, hookless / TSS only Max Tire Pressure Up to 73 psi / 5.0 bar (tire-width dependent — see below) Max System Weight 253 lb / 115 kg (bike + rider + gear) Weight 1585g per set (incl. valves & tape) Rim Tape 26mm tubeless tape Warranty Lifetime Warranty + Crash Replacement Sold As Wheelset (front + rear) Max Tire Pressure by Width 28–29mm 72 psi / 5.0 bar 30–34mm 65 psi / 4.5 bar 35–39mm 58 psi / 4.0 bar Compatibility & Fitment This is the SRAM XDR build — it requires an XDR-compatible cassette (SRAM 12-speed road / XPLR). It is not compatible with 10/11-speed SRAM/Shimano road cassettes. The 404 S is a hookless (TSS) wheel and must be paired with a hookless-compatible tire. Built for road and all-road riding — not intended for gravel . Dialing in your setup? Reference the Zipp Tire Compatibility Chart and Tire Pressure Guide before your first ride. Full specs & resources here.