Specialized Roubaix vs Trek Domane
Choosing between the Specialized Roubaix and the Trek Domane? This compares the 2026 Specialized Roubaix SL8 Comp with the 2026 Trek Domane SL Gen 4, size by size, from the geometry Specialized and Trek publish. Pick any size to compare it in the full tool.
The 56 is the Trek Domane SL Gen 4 size closest to your 54 Specialized Roubaix SL8 Comp. 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 Domane SL Gen 4
Compared with the Specialized Roubaix SL8 Comp in 54, the Trek Domane SL Gen 4 in 56 places the top of the head tube 6 mm higher and 4 mm further back, relative to the bottom bracket. Its wheelbase is 3 mm longer, which can contribute to stability at speed.
- Frame stack
- +6 mm
- Higher front end
- Frame reach
- −4 mm
- Shorter frame reach
- Wheelbase
- +3 mm
- Longer: steadier at speed
- Head angle
- −0.4°
- Slacker: calmer steering
- Chainstays
- ±0 mm
- About the same
Which Trek Domane SL Gen 4 size matches your Specialized Roubaix SL8 Comp
For each Specialized Roubaix SL8 Comp size, the Trek Domane SL Gen 4 size with the closest frame stack and reach. Stack and reach show how far off it is: the Trek Domane SL Gen 4 minus the Specialized Roubaix SL8 Comp. A geometry match, not a fit recommendation.
| Specialized Roubaix SL8 Comp size | Closest size | Stack | Reach |
|---|---|---|---|
| 44 | 50 | +3 mm | +15 mm |
| 49 | 50 | −3 mm | +5 mm |
| 52 | 52 | −5 mm | +1 mm |
| 54 | 56 | +6 mm | −4 mm |
| 56 | 58 | +6 mm | −9 mm |
| 58 | 60 | +2 mm | −14 mm |
| 61 | 62 | −9 mm | −17 mm |
| 64 | 62 | −29 mm | −23 mm |
The two frames
Specialized Roubaix SL8 Comp, 54Trek Domane SL Gen 4, 56Drawn to scale and lined up at the bottom bracket.
Geometry side by side
| Measurement | Specialized Roubaix SL8 Comp 54 | Trek Domane SL Gen 4 56 | Difference |
|---|---|---|---|
| Reach | 381 | 377 | −4 mm |
| Stack | 585 | 591 | +6 mm |
| Head tube angle | 72.3 | 71.9 | −0.4° |
| Seat tube angle | 74 | 73.3 | −0.7° |
| Effective top tube | 550 | 554 | +4 mm |
| Chainstay length | 420 | 420 | ±0 mm |
| Wheelbase | 1005 | 1008 | +3 mm |
| BB drop | 78 | 78 | ±0 mm |
| BB height | 270 | 258 | −12 mm |
| Standover | 766 | 776 | +10 mm |
| Seat tube length | 465 | 525 | +60 mm |
| Fork length | 375 | not listed | |
| Head tube length | 122 | 175 | +53 mm |
Differences are the Trek Domane SL Gen 4 minus the Specialized Roubaix SL8 Comp. Full charts: 2026 Specialized Roubaix SL8 Comp, 2026 Trek Domane SL Gen 4.
Where each sits in its class
Specialized Roubaix SL8 CompTrek Domane SL Gen 4
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 Roubaix SL8 CompSL8 Comp | Trek Domane SL Gen 4 |
|---|---|---|
| Frame | Specialized FACT 10r | not listed |
| Fork | Specialized Future Shock 3.2 | not listed |
| Shifter | Shimano 105 R7170 Di2 | not listed |
| Derailleur | Shimano 105 R7150 Di2, Shimano 105 Di2 | not listed |
| Cassette | Shimano 105 R7100 | not listed |
| Chain | Shimano SLX M7100 | not listed |
| Crankset | Shimano 105 | not listed |
| Chainring | Shimano 105 | not listed |
| Bottom bracket | Shimano Threaded BSA | not listed |
| Wheelset | DT Swiss G540 | not listed |
| Tire | Specialized Mondo, Mondo Endurance | not listed |
| Rim | DT Swiss G 540 | not listed |
| Brake | Shimano 105 | not listed |
| Handlebar | Specialized Hover | not listed |
| Stem | Specialized Future | not listed |
| Grips | Supacaz Super Sticky Kush | not listed |
| Bar tape | Supacaz Super Sticky Kush | not listed |
| Seatpost | Specialized S-Works Pave | not listed |
| Saddle | Specialized Power Sport | not listed |