2021 Specialized Tarmac SL6 vs 2023 Specialized Aethos Expert
The Specialized Aethos Expert size closest to your 54 is the 54. Compare the 54 instead
What changes on the Specialized Aethos Expert
Compared with the Specialized Tarmac SL6 in 54, the Specialized Aethos Expert in 58 places the top of the head tube 47 mm higher and 18 mm further forward, relative to the bottom bracket. Its wheelbase is 27 mm longer, which can contribute to stability at speed.
- Frame stack
- +47 mm
- Higher front end
- Frame reach
- +18 mm
- Longer frame reach
- Wheelbase
- +27 mm
- Longer: steadier at speed
- Head angle
- +0.5°
- Steeper: sharper steering
- Chainstays
- ±0 mm
- About the same
The two frames
Specialized Tarmac SL6, 54Specialized Aethos Expert, 58Drawn to scale and lined up at the bottom bracket.
Geometry side by side
| Measurement | Specialized Tarmac SL6 54 | Specialized Aethos Expert 58 | Difference |
|---|---|---|---|
| Reach | 384mm | 402mm | +18 mm |
| Stack | 544mm | 591mm | +47 mm |
| Head tube angle | 73° | 73.5° | +0.5° |
| Seat tube angle | 74° | 73.5° | −0.5° |
| Chainstay length | 410mm | 410mm | ±0 mm |
| Wheelbase | 978mm | 1005mm | +27 mm |
| BB drop | 72mm | 72mm | ±0 mm |
| BB height | 268mm | 268mm | ±0 mm |
| Standover | 775mm | 796mm | +21 mm |
| Seat tube length | 499mm | 532mm | +33 mm |
| Fork length | 363mm | 369mm | +6 mm |
| Head tube length | 143mm | 184mm | +41 mm |
Differences are the Specialized Aethos Expert minus the Specialized Tarmac SL6. Full charts: 2021 Specialized Tarmac SL6, 2023 Specialized Aethos Expert.
Where each sits in its class
Specialized Tarmac SL6Specialized Aethos Expert
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 SL6Tarmac SL6 - Shimano Tiagra | Specialized Aethos ExpertExpert |
|---|---|---|
| Frame | Specialized Tarmac SL6 | Specialized Aethos FACT |
| Shifter | Shimano Tiagra | SRAM Rival eTAP AXS |
| Derailleur | Shimano Tiagra | SRAM Rival eTAP AXS |
| Chain | KMC X10 | SRAM Rival |
| Crankset | Shimano Tiagra 4700 | SRAM Rival AXS Power Meter |
| Wheelset | Specialized Axis Sport | Roval C38 |
| Tire | Specialized Turbo Pro | Specialized S-Works Turbo |
| Saddle | Specialized Power Sport | Specialized Power Expert |
| Cassette | not listed | SRAM Rival |
| Bottom bracket | not listed | SRAM DUB |
| Brake | not listed | SRAM Rival eTap AXS |
| Seatpost | not listed | Roval Alpinist |
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