2024 Specialized Aethos Comp vs 2026 Specialized Tarmac SL8 Pro Shimano
The 49 is the Specialized Tarmac SL8 Pro Shimano size closest to your 49 Specialized Aethos Comp. 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 Comp in 49, the Specialized Tarmac SL8 Pro Shimano in 49 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
- ±0 mm
- About the same
- Head angle
- n/a
- One of the bikes has no number for this
- Chainstays
- ±0 mm
- About the same
The two frames
Only the Specialized Aethos Comp is drawn. The Specialized Tarmac SL8 Pro Shimano numbers we have for size 49 are missing the head angle.
Geometry side by side
| Measurement | Specialized Aethos Comp 49 | Specialized Tarmac SL8 Pro Shimano 49 | Difference |
|---|---|---|---|
| Reach | 375mm | 375 | ±0 mm |
| Stack | 514mm | 514 | ±0 mm |
| Head tube angle | 71.75° | not listed | |
| Seat tube angle | 75.5° | 75.5 | ±0.0° |
| Chainstay length | 410mm | 410 | ±0 mm |
| Wheelbase | 973mm | 973 | ±0 mm |
| BB drop | 74mm | not listed | |
| BB height | 266mm | not listed | |
| Standover | 705mm | not listed | |
| Seat tube length | 431mm | not listed | |
| Fork length | 369mm | not listed | |
| Head tube length | 109mm | 109 | ±0 mm |
Differences are the Specialized Tarmac SL8 Pro Shimano minus the Specialized Aethos Comp. Full charts: 2024 Specialized Aethos Comp, 2026 Specialized Tarmac SL8 Pro Shimano.
Where each sits in its class
Specialized Aethos CompSpecialized 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 CompComp | Specialized Tarmac SL8 Pro ShimanoPro - Shimano Ultegra Di2 |
|---|---|---|
| Frame | Specialized Aethos | Specialized Tarmac SL8 |
| Fork | Specialized FACT | Specialized FACT 10r |
| Shifter | Shimano 105 R7170 | Shimano Ultegra R8170 |
| Derailleur | Shimano 105 R7150 Di2 | Shimano Ultegra R8150 Di2 |
| Cassette | Shimano 105 | Shimano Ultegra |
| Chain | Shimano SLX M7100 | Shimano XT M8100 |
| Crankset | Shimano 105 R7100 | Shimano Ultegra R81000 |
| Bottom bracket | Shimano Threaded BSA BB | Shimano Threaded BSA |
| Wheelset | DT Swiss R470 | Roval Rapide CL III |
| Tire | Turbo Pro | Specialized S-Works Turbo |
| Brake | Shimano 105, Shimano 105 R7170 | Shimano Ultegra R8170 |
| Handlebar | Specialized Shallow Drop | Roval Rapide Cockpit |
| Stem | Specialized Pro SL | Roval Rapide Cockpit |
| Bar tape | Specialized Roubaix S-Wrap | Supacaz Super Sticky Kush |
| Seatpost | Roval Alpinist | Specialized S-Works Tarmac SL8 |
| Saddle | Specialized Power Sport | Specialized Power Pro |
| Rotor | not listed | Shimano Ultegra R8170 |
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