2025 Specialized Aethos Pro vs 2026 Specialized Tarmac SL8 Pro Shimano
The 56 is the Specialized Tarmac SL8 Pro Shimano size closest to your 56 Specialized Aethos Pro. 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 Tarmac SL8 Pro Shimano
Compared with the Specialized Aethos Pro in 56, the Specialized Tarmac SL8 Pro Shimano in 56 places the top of the head tube at about the same height and about as far forward, relative to the bottom bracket.
- Frame stack
- ±0 mm
- About the same height
- Frame reach
- ±0 mm
- About the same reach
- Wheelbase
- ±0 mm
- About the same
- Head angle
- ±0.0°
- About the same head angle
- Chainstays
- ±0 mm
- About the same
The two frames
Specialized Aethos Pro, 56Specialized Tarmac SL8 Pro Shimano, 56Drawn to scale and lined up at the bottom bracket.
Geometry side by side
| Measurement | Specialized Aethos Pro 56 | Specialized Tarmac SL8 Pro Shimano 56 | Difference |
|---|---|---|---|
| Reach | 395mm | 395 | ±0 mm |
| Stack | 565mm | 565 | ±0 mm |
| Head tube angle | 73.5° | 73.5 | ±0.0° |
| Seat tube angle | 73.5° | 73.5 | ±0.0° |
| Effective top tube | 562mm | not listed | |
| Chainstay length | 410mm | 410 | ±0 mm |
| Wheelbase | 991mm | 991 | ±0 mm |
| BB drop | 72mm | not listed | |
| BB height | 268mm | not listed | |
| Standover | 769mm | not listed | |
| Seat tube length | 504mm | not listed | |
| Fork length | 369mm | not listed | |
| Head tube length | 157mm | 157 | ±0 mm |
Differences are the Specialized Tarmac SL8 Pro Shimano minus the Specialized Aethos Pro. Full charts: 2025 Specialized Aethos Pro, 2026 Specialized Tarmac SL8 Pro Shimano.
Where each sits in its class
Specialized Aethos ProSpecialized Tarmac SL8 Pro Shimano
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 | Specialized Aethos Pro | Specialized Tarmac SL8 Pro ShimanoPro - Shimano Ultegra Di2 |
|---|---|---|
| Frame | not listed | Specialized Tarmac SL8 |
| Fork | not listed | Specialized FACT 10r |
| Shifter | not listed | Shimano Ultegra R8170 |
| Derailleur | not listed | Shimano Ultegra R8150 Di2 |
| Cassette | not listed | Shimano Ultegra |
| Chain | not listed | Shimano XT M8100 |
| Crankset | not listed | Shimano Ultegra R81000 |
| Bottom bracket | not listed | Shimano Threaded BSA |
| Wheelset | not listed | Roval Rapide CL III |
| Tire | not listed | Specialized S-Works Turbo |
| Brake | not listed | Shimano Ultegra R8170 |
| Rotor | not listed | Shimano Ultegra R8170 |
| Handlebar | not listed | Roval Rapide Cockpit |
| Stem | not listed | Roval Rapide Cockpit |
| Bar tape | not listed | Supacaz Super Sticky Kush |
| Seatpost | not listed | Specialized S-Works Tarmac SL8 |
| Saddle | not listed | Specialized Power Pro |
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