2023 Specialized Aethos Expert 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 Expert in 54, the Trek Émonda ALR in 50 places the top of the head tube 23 mm lower and 6 mm further back, relative to the bottom bracket. Its wheelbase is 4 mm shorter, which can contribute to quicker direction changes.
- Frame stack
- −23 mm
- Lower front end
- Frame reach
- −6 mm
- Shorter frame reach
- Wheelbase
- −4 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 Expert is drawn. The Trek Émonda ALR numbers we have for size 50 are missing the seat angle.
Geometry side by side
| Measurement | Specialized Aethos Expert 54 | Trek Émonda ALR 50 | Difference |
|---|---|---|---|
| Reach | 384mm | 378 | −6 mm |
| Stack | 544mm | 521 | −23 mm |
| Head tube angle | 73° | 72.1° | −0.9° |
| Seat tube angle | 74° | not listed | |
| Chainstay length | 410mm | 410 | ±0 mm |
| Wheelbase | 978mm | 974 | −4 mm |
| BB drop | 72mm | 72 | ±0 mm |
| BB height | 268mm | not listed | |
| Standover | 748mm | 711 | −37 mm |
| Seat tube length | 481mm | 453 | −28 mm |
| Fork length | 369mm | not listed | |
| Head tube length | 137mm | 111 | −26 mm |
| Effective top tube | not listed | 521 |
Differences are the Trek Émonda ALR minus the Specialized Aethos Expert. Full charts: 2023 Specialized Aethos Expert, 2025 Trek Émonda ALR.
Where each sits in its class
Specialized Aethos ExpertTrek 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 ExpertExpert | Trek Émonda ALRALR 5 |
|---|---|---|
| Frame | Specialized Aethos FACT | not listed |
| Shifter | SRAM Rival eTAP AXS | not listed |
| Derailleur | SRAM Rival eTAP AXS | not listed |
| Cassette | SRAM Rival | not listed |
| Chain | SRAM Rival | not listed |
| Crankset | SRAM Rival AXS Power Meter | not listed |
| Bottom bracket | SRAM DUB | not listed |
| Wheelset | Roval C38 | Bontrager Paradigm SL |
| Tire | Specialized S-Works Turbo | Bontrager R1 Hard-Case Lite |
| Brake | SRAM Rival eTap AXS | not listed |
| Seatpost | Roval Alpinist | not listed |
| Saddle | Specialized Power Expert | not listed |
| Fork | not listed | Trek Émonda ALR |
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