2025 Trek Domane SL Gen 4 vs 2025 Specialized Roubaix SL8 Pro
The 44 is the Specialized Roubaix SL8 Pro size closest to your 47 Trek Domane SL Gen 4. 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 Specialized Roubaix SL8 Pro
Compared with the Trek Domane SL Gen 4 in 47, the Specialized Roubaix SL8 Pro in 44 places the top of the head tube 16 mm higher and 11 mm further back, relative to the bottom bracket. Its wheelbase is 8 mm longer, which can contribute to stability at speed.
- Frame stack
- +16 mm
- Higher front end
- Frame reach
- −11 mm
- Shorter frame reach
- Wheelbase
- +8 mm
- Longer: steadier at speed
- Head angle
- −1.7°
- Slacker: calmer steering
- Chainstays
- −2 mm
- About the same
The two frames
We can't draw these frames yet. The Trek Domane SL Gen 4 numbers we have for size 47 are missing the seat angle. The numbers below still compare.
Geometry side by side
| Measurement | Trek Domane SL Gen 4 47 | Specialized Roubaix SL8 Pro 44 | Difference |
|---|---|---|---|
| Reach | 364 | 353mm | −11 mm |
| Stack | 527 | 543mm | +16 mm |
| Head tube angle | 71.0° | 69.3° | −1.7° |
| Effective top tube | 509 | not listed | |
| Chainstay length | 420 | 418mm | −2 mm |
| Wheelbase | 986 | 994mm | +8 mm |
| BB drop | 80 | 80mm | ±0 mm |
| Standover | 686 | 686mm | ±0 mm |
| Seat tube length | 420 | 365mm | −55 mm |
| Head tube length | 110 | 90mm | −20 mm |
| Seat tube angle | not listed | 75° | |
| BB height | not listed | 269mm | |
| Fork length | not listed | 375mm |
Differences are the Specialized Roubaix SL8 Pro minus the Trek Domane SL Gen 4. Full charts: 2025 Trek Domane SL Gen 4, 2025 Specialized Roubaix SL8 Pro.
Where each sits in its class
Trek Domane SL 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 SL Gen 4SL 5 Gen 4 | Specialized Roubaix SL8 ProSL8 Pro |
|---|---|---|
| Frame | Trek Domane SL | not listed |
| Fork | Trek Domane SL | Specialized Future Shock 3.3 |
| Shifter | Shimano 105 R7120 | Shimano Ultegra R8170 Di2 |
| Derailleur | Shimano 105 R7100 | Shimano Ultegra R8150 Di2 |
| Cassette | Shimano 105 R7101 | Shimano Ultegra |
| Chain | Shimano SLX M7100 | Shimano XT M8100 |
| Crankset | Shimano 105 R7100 | Shimano Ultegra R8100 |
| Bottom bracket | Praxis T47 | not listed |
| Wheelset | Bontrager Paradigm SL | Roval Terra CL II |
| Tire | Bontrager R3 | Specialized S-Works Mondo 2BR |
| Rim | Bontrager Paradigm SL | not listed |
| Brake | Shimano Disc 105 | Shimano Ultegra |
| Rotor | Shimano SM-RT70 | not listed |
| Handlebar | Bontrager IsoZone VR-SF | not listed |
| Stem | Trek RCS | Specialized Future |
| Bar tape | Bontrager Supertack Perf | not listed |
| Seatpost | Aero Carbon | Specialized S-Works Pave Seat post |
| Saddle | Bontrager Short Comp | Specialized Power Pro Mirror |
| Bag | Bontrager BITS | not listed |
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