ridley gravel bike size chart Ridley Noah Fast 3.0 Red AXS Bike

The Ridley Noah Fast 3.0 Red AXS Bike is the third generation of Ridley's iconic aero road bike — and by their own engineers' reckoning, the fastest bicycle they have ever built. At 50 kilometers per hour, it produces 8.5 fewer watts of drag than its predecessor. That gap didn't happen by accident. It came from years of development with the Uno-X Mobility professional team, a complete embrace of the UCI's new 8:1 tube profile regulations, and a wind-tunnel campaign that simulated the bike whole — bottles, computer, wheels, and rider — at real-world wind angles.

The frame is built around Ridley's Elite Series Ultra HM carbon layup, woven into the Noah Fast 7E8 chassis. The fork and seat stays exploit the 8:1 rule to the fullest: long, thin profiles that cut through air in ways that previous road bike regulations couldn't allow. The head tube is massive by road bike standards — a deliberate engineering choice that enables full integration of the Nimbus Aero cockpit while eliminating the aerodynamic drag of exposed stem hardware. Every tube follows an optimised NACA profile. Cables are routed entirely internally. The lowered bottom bracket works in tandem with a shaped seatpost to absorb road buzz without giving up stiffness at the pedals.

The geometry marks a genuine shift in how Ridley thinks about rider position. The seat tube steepens to 75° on a size M — two full degrees more than the previous generation — placing riders in the forward, open-hip position that's become standard at the WorldTour level. The reach numbers run longer as a result; if you're sizing off your current bike, compare actual top tube lengths rather than reach figures. The lower head tube and integrated cockpit work together to reduce your frontal area. This is a race bike designed to make you faster by making you smaller.

Design Benefits

1. 8.5-watt aero advantage — Measured at 50 km/h against the previous Noah Fast using complete-bike simulations that account for wheels, bottles, and rider position, the 8.5-watt figure is the kind of real-world improvement that matters in a sprint or a long, exposed effort into a headwind.
2. UCI 8:1 tube profiles — The latest UCI regulations allow tube profiles eight times longer than their width, compared to the previous 3:1 limit. Ridley engineered the fork blades and seat stays to exploit this new freedom, producing the long, narrow profiles that define the bike's silhouette and separate it from anything built under the old rulebook.
3. SRAM Red AXS E1 throughout — The RA Cycles build ships with SRAM's flagship 2025 groupset: Red derailleur front and rear, Red hydraulic disc brakes, and a Red crankset with integrated power meter. The XG-1290 12-speed cassette (10-33) completes the drivetrain at the Red tier.
4. DT Swiss ARC1400 Dicut wheels — At 65mm deep with a 22mm internal width channel, the ARC1400 is built for pure road speed. Dicut spoke lacing reduces aerodynamic disruption on both sides of the wheel, and the DT Swiss hub quality means engagement you can rely on.
5. Nimbus Aero integrated cockpit — Custom-developed for this frame, the Nimbus Aero follows the professional trend toward narrower hoods (360mm C-C) with flared drops (400mm C-C). Three stem stack heights allow precise position dialing without visible spacers. The slight backsweep on the tops adds ergonomic relief on longer efforts.
6. Removable front derailleur clamp — Developed in collaboration with Wolf Tooth, this system includes a custom chainguide, chain catcher, and cover plate that makes a 1x setup look factory-clean. The Red AXS E1 build runs 2x, but the architecture is there if your racing ever calls for it.
7. Universal Derailleur Hanger (UDH) — The standardised UDH means a replacement hanger is available through any bike shop that stocks modern groupset parts. It also acts as a sacrificial component in a crash, protecting the frame and derailleur from the kind of impact that sidelines expensive bikes.

Final Take

The Noah Fast lineage has carried sprinters to Tour de France stage victories — Robbie McEwen, André Greipel, Caleb Ewan all won on predecessors of this platform. The third generation carries that legacy forward with Uno-X Mobility, who used the Noah Fast 3.0 to win the Omloop Het Nieuwsblad and take the team's first-ever Tour stage in 2025. At $14,998.80, this Red AXS build pairs that frame with hardware worthy of it. SRAM's flagship groupset with integrated power, DT Swiss ARC1400 wheels at 65mm deep, and 34mm tire clearance that extends usability well beyond the smoothest circuits. This is a race bike that means it.