Cervelo R5 Red AXS Bike

There are light bikes, and then there is the Cervelo R5 Red AXS Bike. At 5.97kg in a size 56 — 900 grams below the UCI minimum weight limit — this is a machine built with a singular obsession: going uphill faster than should be physically possible. Every gram has been accounted for, every system reconsidered. The result is a climbing road bike that does not feel like it should exist at this weight, yet rides with the composure and precision of something far more substantive.

The R5 frame comes in at 651 grams — 130 grams lighter than its predecessor, a 16% reduction from an already-lean platform. The all-carbon fork adds 298 grams. Cervelo achieved these numbers through a full rethink of the layup, not just a material upgrade. The geometry tells you exactly what this bike is built for: rapid acceleration out of switchbacks, relentless climbing efficiency, and confident, predictable descending on technical mountain roads. Seat tube angles range from 74.5° in the smaller sizes down to 73° for larger frames, with constant 410mm chainstays across the entire size run for consistent rear-end responsiveness regardless of what size you ride. Crucially, the fit geometry mirrors the S5, so riders who split time between the R5 and Cervelo's aero platform can step on either bike without readjusting their position.

The integrated one-piece carbon cockpit contributes meaningfully to the weight story — eliminating roughly 150 grams compared to a conventional bar-and-stem setup — while improving aerodynamics by approximately 2 watts. It is a system that benefits you on the flats before the climbing starts and costs you nothing once the road tilts up. The Reserve 34|37 SL wheelset was developed specifically for the R5, saving an additional 60 grams over the previous wheel pairing while maintaining pro-tier stiffness via DT Swiss 180 hubs. The wheels run tubeless-compatible and ship with Vittoria Corsa Pro Speed TLR tires in 700x26, with clearance for rubber up to 34mm.

The drivetrain is SRAM Red AXS E1 in 12-speed, with wireless electronic shifting throughout. The crankset is SRAM Red AXS E1 at 48/35T with an integrated power meter — so you are measuring watts from the moment you clip in, with no additional hardware to source or install. The cassette runs 10–33T, giving you a wide enough range to keep the cadence smooth on steep pitches without compromising the top end for faster terrain. Braking is handled by SRAM Red hydraulic discs with Paceline X Centerlock rotors. The bottom bracket is a SRAM DUB Ceramic in BBright spec, which keeps the chainline efficient and rolling resistance minimal over long days in the mountains.

Design Benefits

1. Climbing-first geometry with S5 fit compatibility: Constant 410mm chainstays across all sizes, seat tube angles tuned for climbing efficiency, and fit dimensions matched to the S5 so you do not lose your position switching bikes.
2. System weight advantage: 651g frame, 298g fork, ~150g savings from the integrated cockpit, and 60g saved on the Reserve 34|37 SL wheels — the weight reduction compounds across every part of the bike.
3. Power measurement built in: The SRAM Red AXS E1 crankset includes an integrated power meter, so there is no add-on to source or calibrate.
4. Reserve 34|37 SL with DT Swiss 180 hubs: A wheelset developed specifically for this bike, tubeless-ready, and built around one of the lightest and most reliable hub platforms in the industry.
5. Wide tire clearance on a pure climbing frame: Up to 34mm keeps the R5 usable on courses with mixed pavement without asking you to compromise ride comfort for weight.

Final Take

The Cervelo R5 Red AXS is for the rider who has decided that weight matters above everything else on race day. At $14,400, it delivers a complete, race-ready system — integrated power meter, purpose-built wheels, ceramic bottom bracket — that would cost substantially more if you assembled it from scratch. If your A-race involves sustained climbing and you want the lightest, most complete carbon road bike on the market at this price point, the R5 is the answer.