2021 Specialized Aethos Pro vs 2023 Trek Madone SLR
The 47 is the Trek Madone SLR size closest to your 49 Specialized Aethos Pro. 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 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 Pro, 49Trek Madone SLR, 47Drawn to scale and lined up at the bottom bracket.
Geometry side by side
| Measurement | Specialized Aethos Pro 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° |
| 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 |
| Effective top tube | not listed | 512 |
Differences are the Trek Madone SLR minus the Specialized Aethos Pro. Full charts: 2021 Specialized Aethos Pro, 2023 Trek Madone SLR.
Where each sits in its class
Specialized Aethos ProTrek 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 ProPro | Trek Madone SLRSLR 6 |
|---|---|---|
| Frame | Specialized Aethos FACT | Trek Madone |
| Derailleur | SRAM Force eTAP AXS | Shimano Ultegra |
| Cassette | SRAM XG-1270 | Shimano Ultegra |
| Chain | SRAM Force | Shimano 105 DI2 |
| Crankset | SRAM FC Force DUB | Shimano Ultegra Mid Compact |
| Bottom bracket | SRAM DUB | Trek T47 |
| Wheelset | Roval Alpinist CL | Bontrager Aeolus Pro 51 |
| Tire | Specialized S-Works Turbo | Bontrager R3 Hard-Case Lite |
| Brake | SRAM Force eTAP | Shimano Ultegra |
| Seatpost | Roval Alpinist | Trek Madone |
| Saddle | Specialized Power | Bontrager Aeolus Elite |
| Fork | not listed | Trek Madone KVF |
| Shifter | not listed | Shimano Ultegra |
| Chainring | not listed | Shimano Ultegra |
| Rotor | not listed | Shimano Ultegra |
| Handlebar | not listed | Trek Madone Integrated |
| Stem | not listed | Trek Madone aero |
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