2023 Specialized Aethos Comp vs 2025 Trek Émonda ALR
The 47 is the Trek Émonda ALR size closest to your 49 Specialized Aethos Comp. 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 Trek Émonda ALR
Compared with the Specialized Aethos Comp in 49, the Trek Émonda ALR in 47 places the top of the head tube 7 mm lower and about as far forward, relative to the bottom bracket.
- Frame stack
- −7 mm
- Lower front end
- Frame reach
- −2 mm
- About the same reach
- Wheelbase
- −1 mm
- About the same
- Head angle
- +0.3°
- Steeper: sharper steering
- Chainstays
- ±0 mm
- About the same
The two frames
Only the Specialized Aethos Comp is drawn. The Trek Émonda ALR numbers we have for size 47 are missing the seat angle.
Geometry side by side
| Measurement | Specialized Aethos Comp 49 | Trek Émonda ALR 47 | Difference |
|---|---|---|---|
| Reach | 375mm | 373 | −2 mm |
| Stack | 514mm | 507 | −7 mm |
| Head tube angle | 71.75° | 72.1° | +0.3° |
| Seat tube angle | 75.5° | not listed | |
| Chainstay length | 410mm | 410 | ±0 mm |
| Wheelbase | 973mm | 972 | −1 mm |
| BB drop | 74mm | 72 | −2 mm |
| BB height | 266mm | not listed | |
| Standover | 705mm | 692 | −13 mm |
| Seat tube length | 431mm | 424 | −7 mm |
| Fork length | 369mm | not listed | |
| Head tube length | 109mm | 100 | −9 mm |
| Effective top tube | not listed | 512 |
Differences are the Trek Émonda ALR minus the Specialized Aethos Comp. Full charts: 2023 Specialized Aethos Comp, 2025 Trek Émonda ALR.
Where each sits in its class
Specialized Aethos CompTrek 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 CompComp | Trek Émonda ALRALR 5 |
|---|---|---|
| Frame | Specialized Aethos FACT | not listed |
| Shifter | Shimano 105 R7170 Di2 | not listed |
| Derailleur | Shimano 105 R7150 Di2 | not listed |
| Cassette | Shimano 105 | not listed |
| Chain | Shimano SLX M7100 | not listed |
| Crankset | Specialized FC-R7100 | not listed |
| Wheelset | DT Swiss R470 | Bontrager Paradigm SL |
| Tire | Specialized Turbo Pro | Bontrager R1 Hard-Case Lite |
| Brake | Shimano 105 R7170 | not listed |
| Seatpost | Roval Alpinist | not listed |
| Saddle | Specialized Power Sport | not listed |
| Fork | not listed | Trek Émonda ALR |
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