2026 Cervélo R5 vs 2025 Specialized Aethos Pro
The 56 is the Specialized Aethos Pro size closest to your 56 Cervélo R5. We match frame stack and reach. This is a geometry comparison, not a fit recommendation; stem, spacers, handlebars and saddle setup also affect your riding position.
What changes on the Specialized Aethos Pro
Compared with the Cervélo R5 in 56, the Specialized Aethos Pro in 56 places the top of the head tube at about the same height and 4 mm further forward, relative to the bottom bracket.
- Frame stack
- −3 mm
- About the same height
- Frame reach
- +4 mm
- Longer frame reach
- Wheelbase
- −2 mm
- About the same
- Head angle
- +0.5°
- Steeper: sharper steering
- Chainstays
- ±0 mm
- About the same
The two frames
Cervélo R5, 56Specialized Aethos Pro, 56Drawn to scale and lined up at the bottom bracket.
Geometry side by side
| Measurement | Cervélo R5 56 | Specialized Aethos Pro 56 | Difference |
|---|---|---|---|
| Reach | 391.1 | 395mm | +4 mm |
| Stack | 567.5 | 565mm | −3 mm |
| Head tube angle | 73 | 73.5° | +0.5° |
| Seat tube angle | 73 | 73.5° | +0.5° |
| Effective top tube | 565 | 562mm | −3 mm |
| Chainstay length | 410 | 410mm | ±0 mm |
| Wheelbase | 992.8 | 991mm | −2 mm |
| BB drop | 74 | 72mm | −2 mm |
| Head tube length | 156 | 157mm | +1 mm |
| BB height | not listed | 268mm | |
| Standover | not listed | 769mm | |
| Seat tube length | not listed | 504mm | |
| Fork length | not listed | 369mm |
Differences are the Specialized Aethos Pro minus the Cervélo R5. Full charts: 2026 Cervélo R5, 2025 Specialized Aethos Pro.
Where each sits in its class
Cervélo R5Specialized Aethos Pro
Each bike is ranked against the other road bikes on Quiver, on frame geometry alone. Not your hand position or ride feel.
What each ships with
The stock build of each bike's first listed trim. Parts that match are dimmed.
| Part | Cervélo R5Dura-Ace Di2 | Specialized Aethos Pro |
|---|---|---|
| Frame | Cervélo R5 | not listed |
| Shifter | Shimano Dura-Ace Di2 | not listed |
| Derailleur | Shimano Dura-Ace Di2 | not listed |
| Cassette | Shimano Dura-Ace 11-34T | not listed |
| Crankset | Shimano Dura-Ace Di2 | not listed |
| Wheelset | Reserve 34|37TA ST | not listed |
| Tire | Vittoria Corsa Speed | not listed |
| Brake | Shimano Dura-Ace Di2 | not listed |
| Handlebar | Cervélo HB18 | not listed |
| Stem | Cervélo HB18 | not listed |
| Seatpost | Cervélo SP33 D-Shaped | not listed |
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