2025 Specialized Aethos vs 2023 Trek Madone SLR
The 47 is the Trek Madone SLR size closest to your 49 Specialized Aethos. 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 in 49, the Trek Madone SLR in 47 places the top of the head tube 7 mm lower and about as far forward, relative to the bottom bracket.
- Frame stack
- −7 mm
- Lower front end
- Frame reach
- −2 mm
- About the same reach
- Wheelbase
- −1 mm
- About the same
- Head angle
- +0.3°
- Steeper: sharper steering
- Chainstays
- ±0 mm
- About the same
The two frames
Specialized Aethos, 49Trek Madone SLR, 47Drawn to scale and lined up at the bottom bracket.
Geometry side by side
| Measurement | Specialized Aethos 49 | Trek Madone SLR 47 | Difference |
|---|---|---|---|
| Reach | 375mm | 373 | −2 mm |
| Stack | 514mm | 507 | −7 mm |
| Head tube angle | 71.75° | 72.1 | +0.3° |
| Seat tube angle | 75.5° | 74.6 | −0.9° |
| Effective top tube | 508mm | 512 | +4 mm |
| Chainstay length | 410mm | 410 | ±0 mm |
| Wheelbase | 973mm | 972 | −1 mm |
| BB drop | 74mm | 72 | −2 mm |
| BB height | 266mm | not listed | |
| Standover | 705mm | 692 | −13 mm |
| Seat tube length | 431mm | 424 | −7 mm |
| Fork length | 369mm | not listed | |
| Head tube length | 109mm | 100 | −9 mm |
Differences are the Trek Madone SLR minus the Specialized Aethos. Full charts: 2025 Specialized Aethos, 2023 Trek Madone SLR.
Where each sits in its class
Specialized AethosTrek 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 | Trek Madone SLRSLR 6 |
|---|---|---|
| Frame | not listed | Trek Madone |
| Fork | not listed | Trek Madone KVF |
| Shifter | not listed | Shimano Ultegra |
| Derailleur | not listed | Shimano Ultegra |
| Cassette | not listed | Shimano Ultegra |
| Chain | not listed | Shimano 105 DI2 |
| Crankset | not listed | Shimano Ultegra Mid Compact |
| Chainring | not listed | Shimano Ultegra |
| Bottom bracket | not listed | Trek T47 |
| Wheelset | not listed | Bontrager Aeolus Pro 51 |
| Tire | not listed | Bontrager R3 Hard-Case Lite |
| Brake | not listed | Shimano Ultegra |
| Rotor | not listed | Shimano Ultegra |
| Handlebar | not listed | Trek Madone Integrated |
| Stem | not listed | Trek Madone aero |
| Seatpost | not listed | Trek Madone |
| Saddle | not listed | Bontrager Aeolus Elite |
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