2025 Specialized Aethos Shimano vs 2025 Trek Émonda ALR
The 50 is the Trek Émonda ALR size closest to your 52 Specialized Aethos Shimano. 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 Shimano in 52, the Trek Émonda ALR in 50 places the top of the head tube 6 mm lower and about as far forward, relative to the bottom bracket.
- Frame stack
- −6 mm
- Lower front end
- Frame reach
- −2 mm
- About the same reach
- Wheelbase
- −1 mm
- About the same
- Head angle
- −0.4°
- Slacker: calmer steering
- Chainstays
- ±0 mm
- About the same
The two frames
Only the Specialized Aethos Shimano is drawn. The Trek Émonda ALR numbers we have for size 50 are missing the seat angle.
Geometry side by side
| Measurement | Specialized Aethos Shimano 52 | Trek Émonda ALR 50 | Difference |
|---|---|---|---|
| Reach | 380mm | 378 | −2 mm |
| Stack | 527mm | 521 | −6 mm |
| Head tube angle | 72.5° | 72.1° | −0.4° |
| Seat tube angle | 74° | not listed | |
| Effective top tube | 531mm | 521 | −10 mm |
| Chainstay length | 410mm | 410 | ±0 mm |
| Wheelbase | 975mm | 974 | −1 mm |
| BB drop | 74mm | 72 | −2 mm |
| BB height | 266mm | not listed | |
| Standover | 728mm | 711 | −17 mm |
| Seat tube length | 462mm | 453 | −9 mm |
| Fork length | 369mm | not listed | |
| Head tube length | 120mm | 111 | −9 mm |
Differences are the Trek Émonda ALR minus the Specialized Aethos Shimano. Full charts: 2025 Specialized Aethos Shimano, 2025 Trek Émonda ALR.
Where each sits in its class
Specialized Aethos ShimanoTrek 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 ShimanoS-Works - Shimano Dura-Ace Di2 | Trek Émonda ALRALR 5 |
|---|---|---|
| Frame | Specialized Aethos | not listed |
| Shifter | Shimano Dura-Ace R9270 | not listed |
| Derailleur | Shimano Dura-Ace R9250 | not listed |
| Cassette | Shimano Dura-Ace | not listed |
| Chain | Shimano XTR M9100 | not listed |
| Crankset | Shimano Dura-Ace R9200 | not listed |
| Bottom bracket | Shimano Dura-Ace | not listed |
| Wheelset | Roval Alpinist | Bontrager Paradigm SL |
| Tire | Specialized S-Works Turbo 2BR | Bontrager R1 Hard-Case Lite |
| Brake | Shimano Dura-Ace R9200 | not listed |
| Seatpost | Roval Alpinist | not listed |
| Saddle | Specialized S-Works Power | not listed |
| Fork | not listed | Trek Émonda ALR |
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