2027 Trek Madone SLR Gen 8 Frameset vs 2025 Specialized Aethos Pro
The 56 is the Specialized Aethos Pro size closest to your ML Trek Madone SLR Gen 8 Frameset. 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 Trek Madone SLR Gen 8 Frameset in ML, the Specialized Aethos Pro in 56 places the top of the head tube 3 mm higher and 6 mm further forward, relative to the bottom bracket. Its wheelbase is 11 mm longer, which can contribute to stability at speed.
- Frame stack
- +3 mm
- Higher front end
- Frame reach
- +6 mm
- Longer frame reach
- Wheelbase
- +11 mm
- Longer: steadier at speed
- Head angle
- ±0.0°
- About the same head angle
- Chainstays
- ±0 mm
- About the same
The two frames
We can't draw these frames yet. The Trek Madone SLR Gen 8 Frameset numbers we have for size ML are missing the seat angle. The numbers below still compare.
Geometry side by side
| Measurement | Trek Madone SLR Gen 8 Frameset ML | Specialized Aethos Pro 56 | Difference |
|---|---|---|---|
| Reach | 389 | 395mm | +6 mm |
| Stack | 562 | 565mm | +3 mm |
| Head tube angle | 73.5° | 73.5° | ±0.0° |
| Effective top tube | 557 | 562mm | +5 mm |
| Chainstay length | 410 | 410mm | ±0 mm |
| Wheelbase | 980 | 991mm | +11 mm |
| BB drop | 70 | 72mm | +2 mm |
| Standover | 790 | 769mm | −21 mm |
| Seat tube length | 512 | 504mm | −8 mm |
| Head tube length | 150 | 157mm | +7 mm |
| Seat tube angle | not listed | 73.5° | |
| BB height | not listed | 268mm | |
| Fork length | not listed | 369mm |
Differences are the Specialized Aethos Pro minus the Trek Madone SLR Gen 8 Frameset. Full charts: 2027 Trek Madone SLR Gen 8 Frameset, 2025 Specialized Aethos Pro.
Where each sits in its class
Trek Madone SLR Gen 8 FramesetSpecialized 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 | Trek Madone SLR Gen 8 FramesetSLR Gen 8 Frameset | Specialized Aethos Pro |
|---|---|---|
| Fork | Trek Madone Gen 8 one-piece | 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
