2026 Trek Domane AL Gen 4 vs 2025 Specialized Roubaix SL8 Pro
The Specialized Roubaix SL8 Pro size closest to your 54 is the 52. Compare the 52 instead
What changes on the Specialized Roubaix SL8 Pro
Compared with the Trek Domane AL Gen 4 in 54, the Specialized Roubaix SL8 Pro in 44 places the top of the head tube 32 mm lower and 21 mm further back, relative to the bottom bracket. Its wheelbase is 16 mm shorter, which can contribute to quicker direction changes.
- Frame stack
- −32 mm
- Lower front end
- Frame reach
- −21 mm
- Shorter frame reach
- Wheelbase
- −16 mm
- Shorter: quicker to change direction
- Head angle
- −2.0°
- Slacker: calmer steering
- Chainstays
- −2 mm
- About the same
The two frames
Trek Domane AL Gen 4, 54Specialized Roubaix SL8 Pro, 44Drawn to scale and lined up at the bottom bracket.
Geometry side by side
| Measurement | Trek Domane AL Gen 4 54 | Specialized Roubaix SL8 Pro 44 | Difference |
|---|---|---|---|
| Reach | 374 | 353mm | −21 mm |
| Stack | 575 | 543mm | −32 mm |
| Head tube angle | 71.3 | 69.3° | −2.0° |
| Seat tube angle | 73.7 | 75° | +1.3° |
| Effective top tube | 542 | not listed | |
| Chainstay length | 420 | 418mm | −2 mm |
| Wheelbase | 1010 | 994mm | −16 mm |
| BB drop | 80 | 80mm | ±0 mm |
| Standover | 754 | 686mm | −68 mm |
| Seat tube length | 500 | 365mm | −135 mm |
| Head tube length | 160 | 90mm | −70 mm |
| BB height | not listed | 269mm | |
| Fork length | not listed | 375mm |
Differences are the Specialized Roubaix SL8 Pro minus the Trek Domane AL Gen 4. Full charts: 2026 Trek Domane AL Gen 4, 2025 Specialized Roubaix SL8 Pro.
Where each sits in its class
Trek Domane AL Gen 4Specialized Roubaix SL8 Pro
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 | Trek Domane AL Gen 4AL 2 Gen 4 | Specialized Roubaix SL8 ProSL8 Pro |
|---|---|---|
| Frame | Trek Domane AL | not listed |
| Fork | Trek Domane AL | Specialized Future Shock 3.3 |
| Shifter | Shimano Claris R2000 | Shimano Ultegra R8170 Di2 |
| Derailleur | Shimano Claris R2000 | Shimano Ultegra R8150 Di2 |
| Cassette | Shimano HG31 | Shimano Ultegra |
| Chain | Shimano HG71 | Shimano XT M8100 |
| Crankset | Shimano Claris R2000 | Shimano Ultegra R8100 |
| Bottom bracket | Shimano UN300 | not listed |
| Wheelset | Bontrager Paradigm 23 | Roval Terra CL II |
| Tire | Bontrager Kwaremont Comp, Bontrager R1 | Specialized S-Works Mondo 2BR |
| Brake | Tektro MD-C550, Tektro C550 | Shimano Ultegra |
| Rotor | Tektro Wave | not listed |
| Handlebar | Bontrager Comp | not listed |
| Stem | Bontrager Elite | Specialized Future |
| Grips | Not specified | not listed |
| Headset | Integrated, cartridge bearing | not listed |
| Seatpost | Bontrager Comp | Specialized S-Works Pave Seat post |
| Saddle | Bontrager Verse Short | Specialized Power Pro Mirror |
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