2023 Specialized Aethos vs 2025 Trek Émonda ALR
The Trek Émonda ALR size closest to your 54 is the 54. Compare the 54 instead
What changes on the Trek Émonda ALR
Compared with the Specialized Aethos in 54, the Trek Émonda ALR in 58 places the top of the head tube 37 mm higher and 12 mm further forward, relative to the bottom bracket. Its wheelbase is 14 mm longer, which can contribute to stability at speed.
- Frame stack
- +37 mm
- Higher front end
- Frame reach
- +12 mm
- Longer frame reach
- Wheelbase
- +14 mm
- Longer: steadier at speed
- Head angle
- +0.8°
- Steeper: sharper steering
- Chainstays
- +1 mm
- About the same
The two frames
Only the Specialized Aethos is drawn. The Trek Émonda ALR numbers we have for size 58 are missing the seat angle.
Geometry side by side
| Measurement | Specialized Aethos 54 | Trek Émonda ALR 58 | Difference |
|---|---|---|---|
| Reach | 384mm | 396 | +12 mm |
| Stack | 544mm | 581 | +37 mm |
| Head tube angle | 73° | 73.8° | +0.8° |
| Seat tube angle | 74° | not listed | |
| Chainstay length | 410mm | 411 | +1 mm |
| Wheelbase | 978mm | 992 | +14 mm |
| BB drop | 72mm | 68 | −4 mm |
| BB height | 268mm | not listed | |
| Standover | 748mm | 793 | +45 mm |
| Seat tube length | 481mm | 553 | +72 mm |
| Fork length | 369mm | not listed | |
| Head tube length | 137mm | 171 | +34 mm |
| Effective top tube | not listed | 574 |
Differences are the Trek Émonda ALR minus the Specialized Aethos. Full charts: 2023 Specialized Aethos, 2025 Trek Émonda ALR.
Where each sits in its class
Specialized AethosTrek Émonda ALR
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 | Trek Émonda ALRALR 5 |
|---|---|---|
| Fork | not listed | Trek Émonda ALR |
| Wheelset | not listed | Bontrager Paradigm SL |
| Tire | not listed | Bontrager R1 Hard-Case Lite |
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