Oltre
vsS5
Two aero hyperbikes, two engineering temperaments.
The Bianchi Oltre is a sculpted Italian race weapon with vibration damping built into the carbon. The Cervélo S5 is the cold, system-engineered benchmark of the wind tunnel.
Oltre
- Countervail damping — viscoelastic material woven into the carbon layup measurably knocks down road buzz on long efforts.
- Lower entry price — the Comp Ultegra Di2 starts at $6,100, well below anything Cervélo offers on the S5.
- Distinctive design — integrated air deflectors and asymmetric tube shapes draw eyes the way nothing else in the segment does.
- Aggressive low stack and long reach demand a professional fit — short or less-flexible riders will struggle.
- 32 mm tire clearance and weight (~8.0–8.3 kg in mid builds) trail the S5 on both versatility and climbing.
S5
- Wind-tunnel benchmark — Cycling News measured it as the fastest bike they've ever tested at 40 km/h, saving 27.6 W vs. baseline.
- Wider tire clearance (34 mm) and 23 mm internal rims make stock 29 mm tires measure closer to 31 mm — surprising compliance for an aero bike.
- System integration — same Reserve 57|64 wheels and HB19 cockpit on every build in the range, no upgrade path needed for the aero package.
- Price floor is $10,100 — there's no entry-level Rival or 105 build, period.
- BBright press-fit BB and integrated cockpit make home maintenance harder than on most rivals.
Editor’s analysis
Both are uncompromising aero machines — but one was tuned in Treviglio with a sketchpad, the other in Toronto with a CFD model.
On the surface these are direct rivals: full-aero road frames, integrated cockpits, deep carbon wheels, lifetime frame warranties. Both have done time at the front of WorldTour stages — the Cervélo S5 under Visma-Lease a Bike, the Bianchi Oltre under Arkéa-B&B Hotels — and both ship at four- and five-figure price points that put them squarely in the hyperbike conversation.
The Bianchi Oltre commits hardest to the look. Asymmetric tube shapes, F1-style head-tube air deflectors (UCI-illegal, kept on for the rest of us), and one of the lowest stack heights in the segment — a 570 frame sits at 536 mm, against the Cervélo's 542 mm at a 54. Reach runs 18 mm longer too. The Pro tier adds Bianchi's Countervail viscoelastic carbon layup, which reviewers credit with taking the worst sting out of long efforts on bad pavement without softening the bike.
The Cervélo S5 picks a different path: refine the system, not the silhouette. The 2025 update is 124 g lighter and a claimed 6.3 watts faster than the previous generation; Cycling News's wind-tunnel test called it the fastest production bike they've ever measured at 40 km/h. The bayonet fork, HB19 one-piece bar, and co-developed Reserve 57|64 wheels work as a single drag package, and the 34 mm tire clearance plus wide 23 mm internal rims let the stock 29 mm Vittorias balloon out to soak up chip-seal in a way the Bianchi can't quite match.
Put another way: the Bianchi Oltre is the bike you buy when speed has to look fast and feel Italian. The Cervélo S5 is the bike you buy when speed is a measurement you're trying to win.
Where the builds differ.
Comparing our editor's-pick builds side-by-side. Winners highlighted row-by-row — lower price and weight, and the better-spec component, each mark a point.
Build variants & pricing
The Oltre spans seven builds across three frame tiers ($6,100–$25,647); the S5 holds the line at five flagship-only builds ($10,100–$14,500).
Prices are current US MSRP. The Oltre's three frame tiers (Comp, Pro, RC) carry meaningfully different layups — the Pro adds Countervail damping, the RC drops it for outright stiffness. The Cervélo S5 ships a single frame across the range.
How they fit, how they steer.
Bianchi 570 vs Cervélo 54 — the fit-picked sizes for a 5'8" rider on each. The Oltre runs 18 mm longer in reach and 6 mm lower in stack, with a 7 mm longer chainstay and 21 mm longer wheelbase. Identical 73° head tube angle.
Which size should I buy?
Sizes recommended on stack, reach, and effective top tube. The Oltre's range starts smaller (470) and skews longer in reach at every label; the S5's sizes overlap closely with conventional 48–61.
→These are starting points. Flexibility, riding style, and preferred position all shift the answer — if you’re between sizes, a professional fit beats a chart.
What the magazines said.
Published reviews from trusted cycling outlets. Click through for the full write-up.
Which one should you buy?
If you want a sculpted Italian race bike with built-in long-day comfort, get the Oltre. If you want the most measurably aero production frame on the market, get the S5.
Oltre
If you ride hard, value how a bike looks as much as how it goes, and have the fit to handle a low front end — the Oltre Pro delivers a hyperbike experience with a Countervail-damped ride that holds up over five-hour days. Best on flats and rolling terrain, where its stiff rear and aero shapes are most felt.
S5
If your priority is straight-line speed measured in watts saved, and you want a bike that's been engineered as a system rather than a styling exercise — the S5 is the clinical pick. Wider tire clearance and Reserve wheels make it the more versatile of the two, despite its aero focus.
Questions buyers actually ask.
Short answers to the things we get emailed about most often.
01Which is faster on flat roads?
The Cervélo S5, by published wind-tunnel numbers. Cycling News tested the 2025 S5 at 40 km/h with a rider onboard and called it the fastest production bike they've ever measured, saving 27.6 W versus a baseline reference. Cervélo's own claim is 6.3 W faster than the previous S5 generation.
Bianchi's published claim for the Oltre is a 17 W saving at 50 km/h versus the older Oltre XR4, plus a 30% aero advantage in variable winds — but those are internal figures, not independently wind-tunnel verified. Both bikes are in the same top tier; in real-world riding the Cervélo's edge is small but consistent.
02Which climbs better?
The Cervélo S5, narrowly. A size 56 S5 weighs 7.17–7.44 kg in tested builds, while a 55 cm Oltre Pro came in at 8.0–8.3 kg in independent reviews — meaningfully heavier than Bianchi's claimed 7.3 kg. That 600–900 g gap is enough to feel on a 30-minute climb.
That said, both are aero bikes, not climbers. Reviewers consistently note the Oltre rewards big-watt power riders even on ascents thanks to its stiff rear end, and pros use the S5 universally — including on mountain stages — without switching to a lighter frame.
03What's the maximum tire clearance?
Bianchi Oltre: 32 mm officially, with reviewers noting the front derailleur cuts that close at the upper end.
Cervélo S5: 34 mm officially, though one reviewer was sceptical that 34 mm fits without rub. The S5 ships 29 mm Vittoria Corsa Pro tires on Reserve 57|64 wheels (23 mm internal width), so they measure closer to 31 mm on-bike — most of the practical clearance benefit of the wider spec.
Neither is a gravel bike. For anything rougher than chip-seal, look at an Áspero or a Diverge.
04How does Countervail compare to wider tires for ride comfort?
Different tools, similar outcome. Countervail (on the Oltre Pro and Comp, not the RC) weaves viscoelastic material into the carbon layup; Bianchi claims it kills 80% of road vibration. Reviewers confirm it noticeably damps high-frequency buzz without softening the frame's overall stiffness.
The Cervélo S5 has no such layup feature — it relies on stock 29 mm tires on wide internal rims to do the compliance work. Both approaches let you stay aggressive over imperfect pavement; the S5's solution is also better for grip and rolling resistance, while the Oltre's better preserves whatever tire pressure you prefer.
05How serviceable are the integrated cockpits and bottom brackets?
Both bikes use one-piece integrated bar/stems — changing reach or width on either means a new cockpit. The Oltre's Reparto Corse bar is offered in limited Bianchi-spec sizes, which reviewers note as a fit-flexibility limitation. The Cervélo HB19 is sold in more configurations, and Cervélo offers a 60-day no-charge swap if your initial pick is wrong.
Bottom brackets are a sore point on the S5: the proprietary BBright press-fit also houses the Di2 battery, making routine service a hassle. The Oltre uses a more standard PressFit 86.5x41 — still press-fit, still requiring proper tools, but less idiosyncratic.
06Are both compatible with mechanical shifting?
Cervélo S5: No — wireless/electronic only.
Bianchi Oltre: Mostly no, with one exception. The RC and Pro frames are explicitly electronic-only. The Comp frame is the only one in the lineup that supports both mechanical and electronic groupsets — useful if a Shimano 105 mechanical build is what fits the budget.
07What about resale value?
Cervélo S5s typically depreciate 25–35% over three years on the secondhand market, helped by relatively low production volumes and a strong brand reputation among racers.
The Oltre is harder to pin down — the current generation only landed in late 2022, and the polarising aesthetics make it more of a love-it-or-hate-it sell. Italian-brand collectibility tends to soften the bottom out for Bianchi over the long run, but the first three years usually see steeper depreciation than the S5.
08Which is the better long-day bike?
Closer than you'd expect, but the Cervélo S5 edges it. The wide 29 mm Vittorias on Reserve rims cushion the ride enough that one Velo reviewer rode 113 miles in 7 hours and was a fan; Cervélo's slightly more humane stack height also helps.
The Oltre Pro's Countervail tech genuinely takes the edge off long efforts, but the frame's extreme low stack and longer reach demand a serious fit and good flexibility. Past about four hours, that aggressive position is what tires riders out — not the road buzz.
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