2023 Specialized Aethos FACT 12r Carbon 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 FACT 12r Carbon 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 FACT 12r Carbon is drawn. The Trek Émonda ALR numbers we have for size 47 are missing the seat angle.
Geometry side by side
| Measurement | Specialized Aethos FACT 12r Carbon 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 FACT 12r Carbon. Full charts: 2023 Specialized Aethos FACT 12r Carbon, 2025 Trek Émonda ALR.
Where each sits in its class
Specialized Aethos FACT 12r CarbonTrek 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 FACT 12r CarbonS-Works FACT 12r Carbon | Trek Émonda ALRALR 5 |
|---|---|---|
| Frame | Specialized S-Works Aethos FACT | not listed |
| Seatpost | Roval Alpinist | not listed |
| Fork | not listed | Trek Émonda ALR |
| Wheelset | not listed | Bontrager Paradigm SL |
| Tire | not listed | Bontrager R1 Hard-Case Lite |
Know what is on every bike.
Add your bike to Quiver. Keep its parts, setup, and service history together, then share your build.
Explore the app
