2024 Specialized Aethos Pro vs 2026 Specialized Tarmac SL8 Pro Shimano
The Specialized Tarmac SL8 Pro Shimano size closest to your 54 is the 54. Compare the 54 instead
What changes on the Specialized Tarmac SL8 Pro Shimano
Compared with the Specialized Aethos Pro in 54, the Specialized Tarmac SL8 Pro Shimano in 52 places the top of the head tube 17 mm lower and 4 mm further back, relative to the bottom bracket. Its wheelbase is 3 mm shorter, which can contribute to quicker direction changes.
- Frame stack
- −17 mm
- Lower front end
- Frame reach
- −4 mm
- Shorter frame reach
- Wheelbase
- −3 mm
- Shorter: quicker to change direction
- Head angle
- −0.5°
- Slacker: calmer steering
- Chainstays
- ±0 mm
- About the same
The two frames
Specialized Aethos Pro, 54Specialized Tarmac SL8 Pro Shimano, 52Drawn to scale and lined up at the bottom bracket.
Geometry side by side
| Measurement | Specialized Aethos Pro 54 | Specialized Tarmac SL8 Pro Shimano 52 | Difference |
|---|---|---|---|
| Reach | 384mm | 380 | −4 mm |
| Stack | 544mm | 527 | −17 mm |
| Head tube angle | 73° | 72.5 | −0.5° |
| Seat tube angle | 74° | 74 | ±0.0° |
| Chainstay length | 410mm | 410 | ±0 mm |
| Wheelbase | 978mm | 975 | −3 mm |
| BB drop | 72mm | not listed | |
| BB height | 268mm | not listed | |
| Standover | 748mm | not listed | |
| Seat tube length | 481mm | not listed | |
| Fork length | 369mm | not listed | |
| Head tube length | 137mm | 120 | −17 mm |
Differences are the Specialized Tarmac SL8 Pro Shimano minus the Specialized Aethos Pro. Full charts: 2024 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 ProPro | Specialized Tarmac SL8 Pro ShimanoPro - Shimano Ultegra Di2 |
|---|---|---|
| Frame | Specialized Aethos FACT | Specialized Tarmac SL8 |
| Shifter | Shimano Ultegra R8170 Di2 | Shimano Ultegra R8170 |
| Derailleur | Shimano Ultegra R8150 Di2 | Shimano Ultegra R8150 Di2 |
| Cassette | Shimano Ultegra | Shimano Ultegra |
| Chain | Shimano XT M8100 | Shimano XT M8100 |
| Crankset | Shimano Ultegra R8100 | Shimano Ultegra R81000 |
| Wheelset | Roval Alpinist CL II | Roval Rapide CL III |
| Tire | Specialized S-Works Turbo 2BR | Specialized S-Works Turbo |
| Brake | Shimano Ultegra R8170 | Shimano Ultegra R8170 |
| Seatpost | Roval Alpinist | Specialized S-Works Tarmac SL8 |
| Saddle | Specialized Power | Specialized Power Pro |
| Fork | not listed | Specialized FACT 10r |
| Bottom bracket | not listed | Shimano Threaded BSA |
| 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 |
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