2024 Specialized Aethos Pro 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 Pro in 54, the Trek Émonda ALR in 47 places the top of the head tube 37 mm lower and 11 mm further back, relative to the bottom bracket. Its wheelbase is 6 mm shorter, which can contribute to quicker direction changes.
- Frame stack
- −37 mm
- Lower front end
- Frame reach
- −11 mm
- Shorter frame reach
- Wheelbase
- −6 mm
- Shorter: quicker to change direction
- Head angle
- −0.9°
- Slacker: calmer steering
- Chainstays
- ±0 mm
- About the same
The two frames
Only the Specialized Aethos Pro is drawn. The Trek Émonda ALR numbers we have for size 47 are missing the seat angle.
Geometry side by side
| Measurement | Specialized Aethos Pro 54 | Trek Émonda ALR 47 | Difference |
|---|---|---|---|
| Reach | 384mm | 373 | −11 mm |
| Stack | 544mm | 507 | −37 mm |
| Head tube angle | 73° | 72.1° | −0.9° |
| Seat tube angle | 74° | not listed | |
| Chainstay length | 410mm | 410 | ±0 mm |
| Wheelbase | 978mm | 972 | −6 mm |
| BB drop | 72mm | 72 | ±0 mm |
| BB height | 268mm | not listed | |
| Standover | 748mm | 692 | −56 mm |
| Seat tube length | 481mm | 424 | −57 mm |
| Fork length | 369mm | not listed | |
| Head tube length | 137mm | 100 | −37 mm |
| Effective top tube | not listed | 512 |
Differences are the Trek Émonda ALR minus the Specialized Aethos Pro. Full charts: 2024 Specialized Aethos Pro, 2025 Trek Émonda ALR.
Where each sits in its class
Specialized Aethos ProTrek 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 ProPro | Trek Émonda ALRALR 5 |
|---|---|---|
| Frame | Specialized Aethos FACT | not listed |
| Shifter | Shimano Ultegra R8170 Di2 | not listed |
| Derailleur | Shimano Ultegra R8150 Di2 | not listed |
| Cassette | Shimano Ultegra | not listed |
| Chain | Shimano XT M8100 | not listed |
| Crankset | Shimano Ultegra R8100 | not listed |
| Wheelset | Roval Alpinist CL II | Bontrager Paradigm SL |
| Tire | Specialized S-Works Turbo 2BR | Bontrager R1 Hard-Case Lite |
| Brake | Shimano Ultegra R8170 | not listed |
| Seatpost | Roval Alpinist | not listed |
| Saddle | Specialized Power | not listed |
| Fork | not listed | Trek Émonda ALR |
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