2023 Trek Émonda SLR Disc Frameset vs 2025 Specialized Aethos Pro
The Specialized Aethos Pro size closest to your 54 is the 54. Compare the 54 instead
What changes on the Specialized Aethos Pro
Compared with the Trek Émonda SLR Disc Frameset in 54, the Specialized Aethos Pro in 49 places the top of the head tube 27 mm lower and 11 mm further back, relative to the bottom bracket. Its wheelbase is 8 mm shorter, which can contribute to quicker direction changes.
- Frame stack
- −27 mm
- Lower front end
- Frame reach
- −11 mm
- Shorter frame reach
- Wheelbase
- −8 mm
- Shorter: quicker to change direction
- Head angle
- −1.3°
- Slacker: calmer steering
- Chainstays
- ±0 mm
- About the same
The two frames
We can't draw these frames yet. The Trek Émonda SLR Disc Frameset numbers we have for size 54 are missing the seat angle. The numbers below still compare.
Geometry side by side
| Measurement | Trek Émonda SLR Disc Frameset 54 | Specialized Aethos Pro 49 | Difference |
|---|---|---|---|
| Reach | 386 | 375mm | −11 mm |
| Stack | 541 | 514mm | −27 mm |
| Head tube angle | 73.0° | 71.75° | −1.3° |
| Effective top tube | 543 | 508mm | −35 mm |
| Chainstay length | 410 | 410mm | ±0 mm |
| Wheelbase | 981 | 973mm | −8 mm |
| BB drop | 70 | 74mm | +4 mm |
| Standover | 744 | 705mm | −39 mm |
| Seat tube length | 496 | 431mm | −65 mm |
| Head tube length | 131 | 109mm | −22 mm |
| Seat tube angle | not listed | 75.5° | |
| BB height | not listed | 266mm | |
| Fork length | not listed | 369mm |
Differences are the Specialized Aethos Pro minus the Trek Émonda SLR Disc Frameset. Full charts: 2023 Trek Émonda SLR Disc Frameset, 2025 Specialized Aethos Pro.
Where each sits in its class
Trek Émonda SLR Disc FramesetSpecialized 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 Émonda SLR Disc FramesetSLR Disc Frameset | Specialized Aethos Pro |
|---|---|---|
| Frame | Trek Ultralight 800 | not listed |
| Fork | Trek Emonda SLR | not listed |
| Derailleur | Trek derailleurs must have | not listed |
Know what is on every bike.
Add your bike to Quiver. Keep its parts, setup, and service history together, then share your build.
Explore the app
