2023 Trek Émonda SL Disc Frameset vs 2025 Specialized Aethos Pro
The 56 is the Specialized Aethos Pro size closest to your 56 Trek Émonda SL Disc Frameset. 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 Émonda SL Disc Frameset in 56, the Specialized Aethos Pro in 56 places the top of the head tube at about the same height and 4 mm further forward, relative to the bottom bracket. Its wheelbase is 8 mm longer, which can contribute to stability at speed.
- Frame stack
- +2 mm
- About the same height
- Frame reach
- +4 mm
- Longer frame reach
- Wheelbase
- +8 mm
- Longer: steadier at speed
- Head angle
- ±0.0°
- About the same head angle
- Chainstays
- ±0 mm
- About the same
The two frames
We can't draw these frames yet. The Trek Émonda SL 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 SL Disc Frameset 56 | Specialized Aethos Pro 56 | Difference |
|---|---|---|---|
| Reach | 391 | 395mm | +4 mm |
| Stack | 563 | 565mm | +2 mm |
| Head tube angle | 73.5° | 73.5° | ±0.0° |
| Effective top tube | 559 | 562mm | +3 mm |
| Chainstay length | 410 | 410mm | ±0 mm |
| Wheelbase | 983 | 991mm | +8 mm |
| BB drop | 70 | 72mm | +2 mm |
| Standover | 768 | 769mm | +1 mm |
| Seat tube length | 525 | 504mm | −21 mm |
| Head tube length | 151 | 157mm | +6 mm |
| Seat tube angle | not listed | 73.5° | |
| BB height | not listed | 268mm | |
| Fork length | not listed | 369mm |
Differences are the Specialized Aethos Pro minus the Trek Émonda SL Disc Frameset. Full charts: 2023 Trek Émonda SL Disc Frameset, 2025 Specialized Aethos Pro.
Where each sits in its class
Trek Émonda SL 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 SL Disc FramesetSL Disc Frameset | Specialized Aethos Pro |
|---|---|---|
| Frame | Trek Ultralight 500 | not listed |
| Fork | Trek Émonda SL | not listed |
| Derailleur | Trek derailleurs must have | not listed |
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