2022 Specialized Aethos FACT 12r Carbon vs 2024 Specialized Tarmac SL8
The Specialized Tarmac SL8 size closest to your 54 is the 54. Compare the 54 instead
What changes on the Specialized Tarmac SL8
Compared with the Specialized Aethos FACT 12r Carbon in 54, the Specialized Tarmac SL8 in 44 places the top of the head tube 43 mm lower and 18 mm further back, relative to the bottom bracket. Its wheelbase is 8 mm shorter, which can contribute to quicker direction changes.
- Frame stack
- −43 mm
- Lower front end
- Frame reach
- −18 mm
- Shorter frame reach
- Wheelbase
- −8 mm
- Shorter: quicker to change direction
- Head angle
- −2.5°
- Slacker: calmer steering
- Chainstays
- ±0 mm
- About the same
The two frames
Specialized Aethos FACT 12r Carbon, 54Specialized Tarmac SL8, 44Drawn to scale and lined up at the bottom bracket.
Geometry side by side
| Measurement | Specialized Aethos FACT 12r Carbon 54 | Specialized Tarmac SL8 44 | Difference |
|---|---|---|---|
| Reach | 384mm | 366 | −18 mm |
| Stack | 544mm | 501 | −43 mm |
| Head tube angle | 73° | 70.5 | −2.5° |
| Seat tube angle | 74° | 75.5 | +1.5° |
| Chainstay length | 410mm | 410 | ±0 mm |
| Wheelbase | 978mm | 970 | −8 mm |
| BB drop | 72mm | 74 | +2 mm |
| BB height | 268mm | 266 | −2 mm |
| Standover | 748mm | 723 | −25 mm |
| Seat tube length | 481mm | 433 | −48 mm |
| Fork length | 369mm | 370 | +1 mm |
| Head tube length | 137mm | 99 | −38 mm |
Differences are the Specialized Tarmac SL8 minus the Specialized Aethos FACT 12r Carbon. Full charts: 2022 Specialized Aethos FACT 12r Carbon, 2024 Specialized Tarmac SL8.
Where each sits in its class
Specialized Aethos FACT 12r CarbonSpecialized Tarmac SL8
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 FACT 12r CarbonS-Works FACT 12r Carbon | Specialized Tarmac SL8 |
|---|---|---|
| Frame | Specialized S-Works Aethos FACT | not listed |
| Seatpost | Roval Alpinist | not listed |
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