2027 Trek Madone SL Gen 8 vs 2025 Specialized Aethos Pro
The 56 is the Specialized Aethos Pro size closest to your ML Trek Madone SL Gen 8. 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 SL Gen 8 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 SL Gen 8 numbers we have for size ML are missing the seat angle. The numbers below still compare.
Geometry side by side
| Measurement | Trek Madone SL Gen 8 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 SL Gen 8. Full charts: 2027 Trek Madone SL Gen 8, 2025 Specialized Aethos Pro.
Where each sits in its class
Trek Madone SL Gen 8Specialized 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 SL Gen 8SL 6 AXS Gen 8 | Specialized Aethos Pro |
|---|---|---|
| Fork | Trek Madone Gen 8 | not listed |
| Shifter | SRAM Rival AXS E1 | not listed |
| Derailleur | SRAM Rival AXS | not listed |
| Cassette | SRAM XG1250 | not listed |
| Crankset | SRAM Rival AXS | not listed |
| Bottom bracket | SRAM DUB | not listed |
| Wheelset | Bontrager Aeolus Elite 50 | not listed |
| Tire | Bontrager Aeolus Pro | not listed |
| Rotor | SRAM Paceline | not listed |
| Stem | Trek RCS | not listed |
| Seatpost | Trek Madone | not listed |
| Saddle | Bontrager Aeolus Elite | not listed |
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