The Cervélo S5, by a measurable margin. Cycling News's wind-tunnel test crowned it the fastest bike they've ever tested with a rider on board at 40 km/h, saving roughly 27.6 watts versus a baseline bike. Pinarello's own claim for the 2025 Dogma F is a much smaller 0.2% reduction in CdA — they declined to translate that into watts when pressed.

For a 250-watt rider on a flat 40 km loop, the S5's edge is on the order of 20–40 seconds. At social-ride speeds below 30 km/h, the gap shrinks to something you'll never feel.

The Pinarello Dogma F, narrowly. Pinarello claims 6.77 kg for the Dura-Ace Di2 build at size 53; the S5 in size 56 measures around 7.17–7.44 kg in independent testing. That's roughly 400–500 g — about 0.6% of a 70 kg rider's system weight, or ~6 seconds on a 30-minute climb.

That said, reviewers have been surprised by how well the S5 climbs for a full aero bike — Bicycling Australia called its climbing "way above average," and Jonas Vingegaard rides it on mountain stages. The Dogma's win is real but smaller than the bikes' philosophies suggest.

Cervélo S5: 34 mm officially, though one reviewer was "sceptical" of that number and felt 32 mm already looked tight in the chainstays. The S5's wider Reserve internal rim widths mean a 30 mm tire measures closer to 31.5 mm on-bike.

Pinarello Dogma F: 30 mm officially (BikeRadar measured), with Cyclist citing 32 mm. Either way, it's the narrowest clearance in the modern aero-flagship class — the Tarmac SL8 sits at 32 mm, the S5 at 34 mm.

Neither is a gravel bike. If clearance matters to you for comfort or rougher tarmac, the S5 has the headroom and the Dogma doesn't.

Cervélo S5 offers five builds spanning $10,100 (Ultegra Di2) to $14,500 (Red AXS or Red XPLR AXS). Every build ships with the same Reserve 57|64 wheels and HB19 cockpit — the spec spend goes into drivetrain and hub-bearing tier, not aero parts.

Pinarello Dogma F offers two builds, both at $15,750: Shimano Dura-Ace Di2 or SRAM Red eTap AXS. There's no mid-tier Ultegra or Force AXS option, no entry-level price. If your budget is under $13k, the Dogma isn't in the conversation.

The Pinarello Dogma F, by consensus. Rouleur called it "the best handling of any bike I've ridden in recent memory" and described feeling like "you've somehow just graduated to WorldTour level descender." The 2025 update increased the fork rake from 43 mm to 47 mm — counterintuitively, that shortens trail (sharper low-speed turn-in) while lengthening wheelbase (more descending stability).

The S5 is no slouch — Bicycling Australia called its descending "sublimely good" — but Tara Seplavy at Bicycling found the S5 "trickier on fast downhill turns than some race bikes." Direct steering rewards good input, but the Dogma's geometry is more forgiving when lines need correction.

Both ship one-piece carbon cockpits that lock you out of cheap aftermarket bar/stem swaps. The S5's HB19 uses fully internal hose routing — changing length or width means buying a new unit and a partial bleed. Cervélo offers a 60-day fit-swap policy at no extra charge to mitigate this.

The Dogma F's MOST Talon Ultra Fast is also one-piece, but Pinarello sells it in 16 different stem-length and bar-width permutations, so you can dial in fit at the point of sale. Both bikes' headset bearings live behind integrated routing — if you need a headset service, expect a workshop visit either way.

Two reasons. First, Pinarello has no entry-level or mid-tier on the Dogma F — it's a single-tier $15,750 product, where Cervélo cross-subsidises the platform with Ultegra and Force AXS builds.

Second, brand and provenance. Road.cc rated the Dogma F's value at 4/10, noting that Specialized's S-Works Tarmac SL8 with Dura-Ace is roughly £1,000 cheaper and includes a power meter, the Scott Foil RC Pro is nearly £4,000 less, and the Canyon Aeroad CFR comes in around £3,700 below.

Buying a Dogma F is partly buying the Italian nameplate and the Ineos Grenadiers connection. That's a real thing for some buyers — and not for others.

Cervélo uses its proprietary BBright press-fit standard, with the Di2 battery housed inside. Multiple reviewers flag this as a service hassle — the BB is hard to access and the battery sits behind it.

Pinarello sticks with an Italian threaded bottom bracket, an old-school choice the brand defends on reliability and groupset compatibility grounds. Cyclist's review questioned whether a more modern T47 standard would have allowed a stiffer junction — but for everyday ownership, threaded is the friendlier service experience by a wide margin.