2023 Trek Madone SLR vs 2025 Specialized Aethos Pro
The 56 is the Specialized Aethos Pro size closest to your 56 Trek Madone SLR. 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 in 56, the Specialized Aethos Pro in 56 places the top of the head tube at about the same height and 4 mm further forward, relative to the bottom bracket. Its wheelbase is 8 mm longer, which can contribute to stability at speed.
- Frame stack
- +2 mm
- About the same height
- Frame reach
- +4 mm
- Longer frame reach
- Wheelbase
- +8 mm
- Longer: steadier at speed
- Head angle
- ±0.0°
- About the same head angle
- Chainstays
- ±0 mm
- About the same
The two frames
Trek Madone SLR, 56Specialized Aethos Pro, 56Drawn to scale and lined up at the bottom bracket.
Geometry side by side
| Measurement | Trek Madone SLR 56 | Specialized Aethos Pro 56 | Difference |
|---|---|---|---|
| Reach | 391 | 395mm | +4 mm |
| Stack | 563 | 565mm | +2 mm |
| Head tube angle | 73.5 | 73.5° | ±0.0° |
| Seat tube angle | 73.7 | 73.5° | −0.2° |
| Effective top tube | 559 | 562mm | +3 mm |
| Chainstay length | 410 | 410mm | ±0 mm |
| Wheelbase | 983 | 991mm | +8 mm |
| BB drop | 70 | 72mm | +2 mm |
| Standover | 768 | 769mm | +1 mm |
| Seat tube length | 525 | 504mm | −21 mm |
| Head tube length | 151 | 157mm | +6 mm |
| BB height | not listed | 268mm | |
| Fork length | not listed | 369mm |
Differences are the Specialized Aethos Pro minus the Trek Madone SLR. Full charts: 2023 Trek Madone SLR, 2025 Specialized Aethos Pro.
Where each sits in its class
Trek Madone SLRSpecialized 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 SLRSLR 6 | Specialized Aethos Pro |
|---|---|---|
| Frame | Trek Madone | not listed |
| Fork | Trek Madone KVF | not listed |
| Shifter | Shimano Ultegra | not listed |
| Derailleur | Shimano Ultegra | not listed |
| Cassette | Shimano Ultegra | not listed |
| Chain | Shimano 105 DI2 | not listed |
| Crankset | Shimano Ultegra Mid Compact | not listed |
| Chainring | Shimano Ultegra | not listed |
| Bottom bracket | Trek T47 | not listed |
| Wheelset | Bontrager Aeolus Pro 51 | not listed |
| Tire | Bontrager R3 Hard-Case Lite | not listed |
| Brake | Shimano Ultegra | not listed |
| Rotor | Shimano Ultegra | not listed |
| Handlebar | Trek Madone Integrated | not listed |
| Stem | Trek Madone aero | not listed |
| Seatpost | Trek Madone | not listed |
| Saddle | Bontrager Aeolus Elite | not listed |
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