2019 Specialized Tarmac SL6 Pro vs 2021 Specialized Aethos
The Specialized Aethos size closest to your 54 is the 54. Compare the 54 instead
What changes on the Specialized Aethos
Compared with the Specialized Tarmac SL6 Pro in 54, the Specialized Aethos in 52 places the top of the head tube 17 mm lower and 4 mm further back, relative to the bottom bracket.
- Frame stack
- −17 mm
- Lower front end
- Frame reach
- −4 mm
- Shorter frame reach
- Wheelbase
- +2 mm
- About the same
- Head angle
- −0.5°
- Slacker: calmer steering
- Chainstays
- +5 mm
- Longer: more planted
The two frames
Specialized Tarmac SL6 Pro, 54Specialized Aethos, 52Drawn to scale and lined up at the bottom bracket.
Geometry side by side
| Measurement | Specialized Tarmac SL6 Pro 54 | Specialized Aethos 52 | Difference |
|---|---|---|---|
| Reach | 384mm | 380mm | −4 mm |
| Stack | 544mm | 527mm | −17 mm |
| Head tube angle | 73° | 72.5° | −0.5° |
| Seat tube angle | 74° | 74° | ±0.0° |
| Effective top tube | 540mm | not listed | |
| Chainstay length | 405mm | 410mm | +5 mm |
| Wheelbase | 973mm | 975mm | +2 mm |
| BB drop | 72mm | 74mm | +2 mm |
| BB height | 268mm | 266mm | −2 mm |
| Standover | 775mm | 728mm | −47 mm |
| Seat tube length | 481mm | 462mm | −19 mm |
| Fork length | 363mm | 369mm | +6 mm |
| Head tube length | 143mm | 120mm | −23 mm |
Differences are the Specialized Aethos minus the Specialized Tarmac SL6 Pro. Full charts: 2019 Specialized Tarmac SL6 Pro, 2021 Specialized Aethos.
Where each sits in its class
Specialized Tarmac SL6 ProSpecialized Aethos
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 Tarmac SL6 ProPro | Specialized AethosAethos Frameset |
|---|---|---|
| Frame | Specialized Tarmac SL6 | Specialized Aethos FACT |
| Seatpost | not listed | Roval Alpinist |
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