2026 Specialized Roubaix SL8 Expert vs 2025 Trek Domane SL Gen 2 Rim
The 50 is the Trek Domane SL Gen 2 Rim size closest to your 44 Specialized Roubaix SL8 Expert. 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 2 Rim
Compared with the Specialized Roubaix SL8 Expert in 44, the Trek Domane SL Gen 2 Rim in 50 places the top of the head tube 3 mm higher and 15 mm further forward, relative to the bottom bracket.
- Frame stack
- +3 mm
- Higher front end
- Frame reach
- +15 mm
- Longer frame reach
- Wheelbase
- +2 mm
- About the same
- Head angle
- +1.8°
- Steeper: sharper steering
- Chainstays
- +2 mm
- About the same
The two frames
Only the Specialized Roubaix SL8 Expert is drawn. The Trek Domane SL Gen 2 Rim numbers we have for size 50 are missing the seat angle.
Geometry side by side
| Measurement | Specialized Roubaix SL8 Expert 44 | Trek Domane SL Gen 2 Rim 50 | Difference |
|---|---|---|---|
| Reach | 353 | 368 | +15 mm |
| Stack | 543 | 546 | +3 mm |
| Head tube angle | 69.3 | 71.1° | +1.8° |
| Seat tube angle | 75 | not listed | |
| Effective top tube | 503 | 519 | +16 mm |
| Chainstay length | 418 | 420 | +2 mm |
| Wheelbase | 994 | 996 | +2 mm |
| BB drop | 80 | 80 | ±0 mm |
| BB height | 269 | not listed | |
| Standover | 686 | 716 | +30 mm |
| Seat tube length | 365 | 450 | +85 mm |
| Fork length | 375 | not listed | |
| Head tube length | 90 | 130 | +40 mm |
Differences are the Trek Domane SL Gen 2 Rim minus the Specialized Roubaix SL8 Expert. Full charts: 2026 Specialized Roubaix SL8 Expert, 2025 Trek Domane SL Gen 2 Rim.
Where each sits in its class
Specialized Roubaix SL8 ExpertTrek Domane SL Gen 2 Rim
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 ExpertSL8 Expert | Trek Domane SL Gen 2 Rim |
|---|---|---|
| Frame | Specialized Roubaix | not listed |
| Fork | Specialized Future Shock 3.2 | not listed |
| Shifter | Shimano Ultegra R8170 Di2 | not listed |
| Derailleur | Shimano Ultegra R8150 Di2, Shimano Ultegra R8150 | not listed |
| Cassette | Shimano Ultegra R8100 | not listed |
| Chain | Shimano XT M8100 | not listed |
| Crankset | Shimano Ultegra R8100 | not listed |
| Chainring | Shimano 50 105, Shimano 34 105 | not listed |
| Bottom bracket | Shimano Threaded BSA | not listed |
| Wheelset | Roval C38 | not listed |
| Tire | Specialized Mondo TLR Endurance | not listed |
| Brake | Shimano Ultegra R8100 | not listed |
| Handlebar | Specialized Hover Expert | not listed |
| Stem | Specialized Future | not listed |
| Grips | Supacaz Super Sticky Kush | not listed |
| Seatpost | Specialized S-Works Pave | not listed |
| Saddle | Specialized Power Expert | not listed |
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