2026 Trek Domane SLR Gen 4 vs 2025 Specialized Roubaix SL8 Pro
The 49 is the Specialized Roubaix SL8 Pro size closest to your 50 Trek Domane SLR 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 SLR Gen 4 in 50, the Specialized Roubaix SL8 Pro in 49 places the top of the head tube 3 mm higher and 5 mm further back, relative to the bottom bracket. Its wheelbase is 4 mm shorter, which can contribute to quicker direction changes.
- Frame stack
- +3 mm
- Higher front end
- Frame reach
- −5 mm
- Shorter frame reach
- Wheelbase
- −4 mm
- Shorter: quicker to change direction
- Head angle
- −0.3°
- About the same head angle
- Chainstays
- −2 mm
- About the same
The two frames
Trek Domane SLR Gen 4, 50Specialized Roubaix SL8 Pro, 49Drawn to scale and lined up at the bottom bracket.
Geometry side by side
| Measurement | Trek Domane SLR Gen 4 50 | Specialized Roubaix SL8 Pro 49 | Difference |
|---|---|---|---|
| Reach | 368 | 363mm | −5 mm |
| Stack | 546 | 549mm | +3 mm |
| Head tube angle | 71.1 | 70.8° | −0.3° |
| Seat tube angle | 74.6 | 74° | −0.6° |
| Effective top tube | 519 | not listed | |
| Chainstay length | 420 | 418mm | −2 mm |
| Wheelbase | 996 | 992mm | −4 mm |
| BB drop | 80 | 80mm | ±0 mm |
| Standover | 716 | 719mm | +3 mm |
| Seat tube length | 450 | 410mm | −40 mm |
| Head tube length | 130 | 90mm | −40 mm |
| BB height | not listed | 269mm | |
| Fork length | not listed | 375mm |
Differences are the Specialized Roubaix SL8 Pro minus the Trek Domane SLR Gen 4. Full charts: 2026 Trek Domane SLR Gen 4, 2025 Specialized Roubaix SL8 Pro.
Where each sits in its class
Trek Domane SLR 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 SLR Gen 4SLR 7 AXS Gen 4 | Specialized Roubaix SL8 ProSL8 Pro |
|---|---|---|
| Frame | Trek Domane SLR | not listed |
| Shifter | SRAM Force AXS | Shimano Ultegra R8170 Di2 |
| Derailleur | SRAM Force AXS | Shimano Ultegra R8150 Di2 |
| Wheelset | Bontrager Aeolus Pro 51 | Roval Terra CL II |
| Tire | Bontrager Kwaremont | Specialized S-Works Mondo 2BR |
| Brake | SRAM Force | Shimano Ultegra |
| Handlebar | Bontrager Aero | not listed |
| Stem | Trek RCS | Specialized Future |
| Grips | Trek EcoTack | not listed |
| Seatpost | Trek KVF | Specialized S-Works Pave Seat post |
| Saddle | Bontrager Short Pro | Specialized Power Pro Mirror |
| Fork | not listed | Specialized Future Shock 3.3 |
| Cassette | not listed | Shimano Ultegra |
| Chain | not listed | Shimano XT M8100 |
| Crankset | not listed | Shimano Ultegra R8100 |
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