2024 Trek Émonda ALR vs 2025 Specialized Aethos Pro
The 58 is the Specialized Aethos Pro size closest to your 58 Trek Émonda ALR. 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 ALR in 58, the Specialized Aethos Pro in 58 places the top of the head tube 10 mm higher and 6 mm further forward, relative to the bottom bracket. Its wheelbase is 13 mm longer, which can contribute to stability at speed.
- Frame stack
- +10 mm
- Higher front end
- Frame reach
- +6 mm
- Longer frame reach
- Wheelbase
- +13 mm
- Longer: steadier at speed
- Head angle
- −0.3°
- About the same head angle
- Chainstays
- −1 mm
- About the same
The two frames
We can't draw these frames yet. The Trek Émonda ALR numbers we have for size 58 are missing the seat angle. The numbers below still compare.
Geometry side by side
| Measurement | Trek Émonda ALR 58 | Specialized Aethos Pro 58 | Difference |
|---|---|---|---|
| Reach | 396 | 402mm | +6 mm |
| Stack | 581 | 591mm | +10 mm |
| Head tube angle | 73.8° | 73.5° | −0.3° |
| Effective top tube | 574 | 577mm | +3 mm |
| Chainstay length | 411 | 410mm | −1 mm |
| Wheelbase | 992 | 1005mm | +13 mm |
| BB drop | 68 | 72mm | +4 mm |
| Standover | 793 | 796mm | +3 mm |
| Seat tube length | 553 | 532mm | −21 mm |
| Head tube length | 171 | 184mm | +13 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 ALR. Full charts: 2024 Trek Émonda ALR, 2025 Specialized Aethos Pro.
Where each sits in its class
Trek Émonda ALRSpecialized 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 ALRALR 5 | Specialized Aethos Pro |
|---|---|---|
| Fork | Trek Émonda ALR | not listed |
| Wheelset | Bontrager Paradigm SL | not listed |
| Tire | Bontrager R1 Hard-Case Lite | not listed |
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