2025 Specialized Aethos Pro Shimano vs 2023 Trek Madone SLR
The 54 is the Trek Madone SLR size closest to your 54 Specialized Aethos Pro Shimano. 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 Trek Madone SLR
Compared with the Specialized Aethos Pro Shimano in 54, the Trek Madone SLR in 54 places the top of the head tube 3 mm lower and about as far forward, relative to the bottom bracket. Its wheelbase is 3 mm longer, which can contribute to stability at speed.
- Frame stack
- −3 mm
- Lower front end
- Frame reach
- +2 mm
- About the same reach
- Wheelbase
- +3 mm
- Longer: steadier at speed
- Head angle
- ±0.0°
- About the same head angle
- Chainstays
- ±0 mm
- About the same
The two frames
Specialized Aethos Pro Shimano, 54Trek Madone SLR, 54Drawn to scale and lined up at the bottom bracket.
Geometry side by side
| Measurement | Specialized Aethos Pro Shimano 54 | Trek Madone SLR 54 | Difference |
|---|---|---|---|
| Reach | 384mm | 386 | +2 mm |
| Stack | 544mm | 541 | −3 mm |
| Head tube angle | 73° | 73.0 | ±0.0° |
| Seat tube angle | 74° | 73.7 | −0.3° |
| Effective top tube | 540mm | 543 | +3 mm |
| Chainstay length | 410mm | 410 | ±0 mm |
| Wheelbase | 978mm | 981 | +3 mm |
| BB drop | 72mm | 70 | −2 mm |
| BB height | 268mm | not listed | |
| Standover | 748mm | 744 | −4 mm |
| Seat tube length | 481mm | 496 | +15 mm |
| Fork length | 369mm | not listed | |
| Head tube length | 137mm | 131 | −6 mm |
Differences are the Trek Madone SLR minus the Specialized Aethos Pro Shimano. Full charts: 2025 Specialized Aethos Pro Shimano, 2023 Trek Madone SLR.
Where each sits in its class
Specialized Aethos Pro ShimanoTrek Madone SLR
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 Pro ShimanoPro - Shimano Ultegra Di2 | Trek Madone SLRSLR 6 |
|---|---|---|
| Frame | Specialized Aethos FACT | Trek Madone |
| Shifter | Shimano Ultegra R8170 Di2 | Shimano Ultegra |
| Derailleur | Shimano Ultegra R8150 Di2 | Shimano Ultegra |
| Cassette | Shimano Ultegra | Shimano Ultegra |
| Chain | Shimano XT M8100 | Shimano 105 DI2 |
| Crankset | Shimano Ultegra R8100 | Shimano Ultegra Mid Compact |
| Wheelset | Roval Alpinist CL II | Bontrager Aeolus Pro 51 |
| Tire | Specialized S-Works Turbo 2BR | Bontrager R3 Hard-Case Lite |
| Brake | Shimano Ultegra R8170 | Shimano Ultegra |
| Seatpost | Roval Alpinist | Trek Madone |
| Saddle | Specialized Power Pro | Bontrager Aeolus Elite |
| Fork | not listed | Trek Madone KVF |
| Chainring | not listed | Shimano Ultegra |
| Bottom bracket | not listed | Trek T47 |
| Rotor | not listed | Shimano Ultegra |
| Handlebar | not listed | Trek Madone Integrated |
| Stem | not listed | Trek Madone aero |
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