The R5, by a wide margin. Granfondo measured a top-trim R5 at 5.97 kg (size 56), with a frame weight of 657 g painted. Cervélo doesn't publish a comparable Caledonia-5 frame weight, but Velo measured the previous Caledonia-5 frame at 995 g (size 56) — roughly 340 g heavier in the frame alone, before component differences add to the gap.

For a 70 kg rider, that's enough mass that you'll feel it on sustained climbs, especially repeated efforts.

The Caledonia-5, with 36 mm of official clearance and room for fenders at 34 mm. The R5 clears 34 mm, even though it ships stock with 26 mm Vittoria Corsa Pro Speed tires.

Neither is a gravel bike, but the Caledonia-5 will comfortably absorb hardpack, chip-seal, and the kind of broken pavement that ruins a long ride. The R5 stays firmly on the tarmac.

Depends on what you ride. The R5 buys you a meaningfully lighter, stiffer, more aggressive race bike with a power meter included on every build. If your riding is climbing-focused and you want the lightest legitimate race bike Cervélo makes, yes.

If your riding is mixed — group rides, weekend centuries, occasional gravel — the Caledonia-5 gives up almost nothing on tarmac and adds versatility the R5 can't match. For most non-racing buyers, the Caledonia-5 is the better value.

The R5 uses the new Cervélo HB18 one-piece bar/stem — fully integrated, lighter, contributes a claimed 2-watt aero saving. Cervélo offers a free 30-day cockpit exchange to dial in fit, which mitigates the usual integrated-cockpit risk.

The Caledonia-5 sticks with a two-piece ST31 stem and HB13 carbon bar. Less aero, slightly heavier, but trivial to swap stem length or bar width without buying a new $400+ unit. For riders still refining their fit, the Caledonia's setup is friendlier.

The Caledonia-5, by design. At size 54 it sits 10.4 mm taller in stack and 5 mm longer in reach than the R5, with a slacker 72° head tube (vs 73°), longer 415 mm chainstays (vs 410 mm), and a wheelbase about 18 mm longer at the equivalent size.

That translates to a more upright cockpit, calmer steering at speed, and better stability on rough surfaces. The R5's lower, longer, racier position rewards a flexible rider but punishes one who's stuck on the trainer all winter.

The R5 ships with dual-sided power meters on every complete build — 4iiii Precision Pro on Shimano models, Quarq on SRAM. That's a real value-add given a quality power meter typically runs $700–$1,200 aftermarket.

The Caledonia-5 only includes power meters on its SRAM builds (Force AXS, Red AXS, Rival AXS) — Quarq spider-based, factory installed. The Shimano Caledonia-5 builds (Ultegra Di2, Dura-Ace Di2) ship without a power meter.

Yes — and most reviewers actively recommend it. The R5's 34 mm clearance comfortably swallows 28 mm or 30 mm tires, and reviewers from BikeRadar, Bicycling, and Granfondo all note the geometry is designed around roughly 29 mm rubber. The stock 26 mm Corsa Pro Speed tires are chosen to hit a marketing weight, not to optimize daily ride quality.

A simple swap to 28 mm Vittoria Corsa Pro Control or similar transforms the R5 into a much more confident bike on real-world roads, at a tiny weight penalty.

Neither is an aero bike — for that, look at Cervélo's S5. Between these two, it's roughly a wash on flat roads at typical amateur speeds. The R5 picked up a modest 2-watt aero saving from the new HB18 cockpit, but its tube shaping is still climbing-first.

The Caledonia-5 borrows aero cues from the S5 (long down tube, dropped seat stays) but the wider 30 mm tires and taller stack add drag. If raw flat-road speed is your priority, neither bike is the right answer — both are tools for different jobs.