2023 Trek Émonda ALR Disc Frameset vs 2025 Specialized Aethos Pro
The Specialized Aethos Pro size closest to your 56 is the 56. Compare the 56 instead
What changes on the Specialized Aethos Pro
Compared with the Trek Émonda ALR Disc Frameset in 56, the Specialized Aethos Pro in 54 places the top of the head tube 19 mm lower and 7 mm further back, relative to the bottom bracket. Its wheelbase is 5 mm shorter, which can contribute to quicker direction changes.
- Frame stack
- −19 mm
- Lower front end
- Frame reach
- −7 mm
- Shorter frame reach
- Wheelbase
- −5 mm
- Shorter: quicker to change direction
- Head angle
- −0.5°
- Slacker: calmer steering
- Chainstays
- ±0 mm
- About the same
The two frames
We can't draw these frames yet. The Trek Émonda ALR Disc Frameset numbers we have for size 56 are missing the seat angle. The numbers below still compare.
Geometry side by side
| Measurement | Trek Émonda ALR Disc Frameset 56 | Specialized Aethos Pro 54 | Difference |
|---|---|---|---|
| Reach | 391 | 384mm | −7 mm |
| Stack | 563 | 544mm | −19 mm |
| Head tube angle | 73.5° | 73° | −0.5° |
| Effective top tube | 559 | 540mm | −19 mm |
| Chainstay length | 410 | 410mm | ±0 mm |
| Wheelbase | 983 | 978mm | −5 mm |
| BB drop | 70 | 72mm | +2 mm |
| Standover | 768 | 748mm | −20 mm |
| Seat tube length | 525 | 481mm | −44 mm |
| Head tube length | 151 | 137mm | −14 mm |
| Seat tube angle | not listed | 74° | |
| BB height | not listed | 268mm | |
| Fork length | not listed | 369mm |
Differences are the Specialized Aethos Pro minus the Trek Émonda ALR Disc Frameset. Full charts: 2023 Trek Émonda ALR Disc Frameset, 2025 Specialized Aethos Pro.
Where each sits in its class
Trek Émonda ALR 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.
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