2023 Trek Madone SLR vs 2025 Specialized Aethos Pro
The 49 is the Specialized Aethos Pro size closest to your 47 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 47, the Specialized Aethos Pro in 49 places the top of the head tube 7 mm higher and about as far forward, relative to the bottom bracket.
- Frame stack
- +7 mm
- Higher front end
- Frame reach
- +2 mm
- About the same reach
- Wheelbase
- +1 mm
- About the same
- Head angle
- −0.3°
- Slacker: calmer steering
- Chainstays
- ±0 mm
- About the same
The two frames
Trek Madone SLR, 47Specialized Aethos Pro, 49Drawn to scale and lined up at the bottom bracket.
Geometry side by side
| Measurement | Trek Madone SLR 47 | Specialized Aethos Pro 49 | Difference |
|---|---|---|---|
| Reach | 373 | 375mm | +2 mm |
| Stack | 507 | 514mm | +7 mm |
| Head tube angle | 72.1 | 71.75° | −0.3° |
| Seat tube angle | 74.6 | 75.5° | +0.9° |
| Effective top tube | 512 | 508mm | −4 mm |
| Chainstay length | 410 | 410mm | ±0 mm |
| Wheelbase | 972 | 973mm | +1 mm |
| BB drop | 72 | 74mm | +2 mm |
| Standover | 692 | 705mm | +13 mm |
| Seat tube length | 424 | 431mm | +7 mm |
| Head tube length | 100 | 109mm | +9 mm |
| BB height | not listed | 266mm | |
| 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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