2024 Specialized Aethos Pro vs 2026 Specialized Tarmac SL8 Pro Shimano
The 58 is the Specialized Tarmac SL8 Pro Shimano size closest to your 58 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 58, the Specialized Tarmac SL8 Pro Shimano in 58 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
- n/a
- One of the bikes has no number for this
- Head angle
- ±0.0°
- About the same head angle
- Chainstays
- ±0 mm
- About the same
The two frames
Only the Specialized Aethos Pro is drawn. The Specialized Tarmac SL8 Pro Shimano numbers we have for size 58 are missing the wheelbase.
Geometry side by side
| Measurement | Specialized Aethos Pro 58 | Specialized Tarmac SL8 Pro Shimano 58 | Difference |
|---|---|---|---|
| Reach | 402mm | 402 | ±0 mm |
| Stack | 591mm | 591 | ±0 mm |
| Head tube angle | 73.5° | 73.5 | ±0.0° |
| Seat tube angle | 73.5° | 73.5 | ±0.0° |
| Chainstay length | 410mm | 410 | ±0 mm |
| Wheelbase | 1005mm | not listed | |
| BB drop | 72mm | not listed | |
| BB height | 268mm | not listed | |
| Standover | 796mm | not listed | |
| Seat tube length | 532mm | not listed | |
| Fork length | 369mm | not listed | |
| Head tube length | 184mm | 184 | ±0 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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