2025 Specialized Tarmac SL8 LTD Bull TdF vs 2025 Specialized Aethos Pro
The 56 is the Specialized Aethos Pro size closest to your 56 Specialized Tarmac SL8 LTD Bull TdF. 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 Aethos Pro
Compared with the Specialized Tarmac SL8 LTD Bull TdF in 56, the Specialized Aethos Pro in 56 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
- ±0.0°
- About the same head angle
- Chainstays
- ±0 mm
- About the same
The two frames
Specialized Tarmac SL8 LTD Bull TdF, 56Specialized Aethos Pro, 56Drawn to scale and lined up at the bottom bracket.
Geometry side by side
| Measurement | Specialized Tarmac SL8 LTD Bull TdF 56 | Specialized Aethos Pro 56 | Difference |
|---|---|---|---|
| Reach | 395mm | 395mm | ±0 mm |
| Stack | 565mm | 565mm | ±0 mm |
| Head tube angle | 73.5° | 73.5° | ±0.0° |
| Seat tube angle | 73.5° | 73.5° | ±0.0° |
| Chainstay length | 410mm | 410mm | ±0 mm |
| Wheelbase | 991mm | 991mm | ±0 mm |
| BB drop | 72mm | 72mm | ±0 mm |
| BB height | 268mm | 268mm | ±0 mm |
| Standover | 786mm | 769mm | −17 mm |
| Seat tube length | 494mm | 504mm | +10 mm |
| Fork length | 370mm | 369mm | −1 mm |
| Head tube length | 157mm | 157mm | ±0 mm |
| Effective top tube | not listed | 562mm |
Differences are the Specialized Aethos Pro minus the Specialized Tarmac SL8 LTD Bull TdF. Full charts: 2025 Specialized Tarmac SL8 LTD Bull TdF, 2025 Specialized Aethos Pro.
Where each sits in its class
Specialized Tarmac SL8 LTD Bull TdFSpecialized Aethos Pro
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 SL8 LTD Bull TdFS-Works LTD Red Bull 2025 TdF | Specialized Aethos Pro |
|---|---|---|
| Frame | Specialized S-Works Tarmac SL8 FACT | not listed |
| Shifter | SRAM RED AXS | not listed |
| Derailleur | SRAM RED AXS E1, SRAM RED E1 | not listed |
| Cassette | SRAM RED XG-1290 E1 | not listed |
| Chain | SRAM Red | not listed |
| Crankset | SRAM RED AXS Power Meter | not listed |
| Bottom bracket | SRAM DUB | not listed |
| Wheelset | Roval Rapide CLX | not listed |
| Tire | Specialized S-Works Turbo TLR | not listed |
| Brake | Specialized override | not listed |
| Handlebar | Roval Rapide Cockpit | not listed |
| Saddle | Specialized S-Works Power | not listed |
Know what is on every bike.
Add your bike to Quiver. Keep its parts, setup, and service history together, then share your build.
Explore the app
