2024 Specialized Roubaix SL8 Sport vs 2025 Trek Domane SL Gen 2 Rim
The 56 is the Trek Domane SL Gen 2 Rim size closest to your 54 Specialized Roubaix SL8 Sport. 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 Sport in 54, the Trek Domane SL Gen 2 Rim 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
The two frames
Only the Specialized Roubaix SL8 Sport is drawn. The Trek Domane SL Gen 2 Rim numbers we have for size 56 are missing the seat angle.
Geometry side by side
| Measurement | Specialized Roubaix SL8 Sport 54 | Trek Domane SL Gen 2 Rim 56 | Difference |
|---|---|---|---|
| Reach | 381mm | 377 | −4 mm |
| Stack | 585mm | 591 | +6 mm |
| Head tube angle | 72.3° | 71.9° | −0.4° |
| Seat tube angle | 74° | not listed | |
| Chainstay length | 420mm | 420 | ±0 mm |
| Wheelbase | 1005mm | 1008 | +3 mm |
| BB drop | 78mm | 78 | ±0 mm |
| BB height | 270mm | not listed | |
| Standover | 766mm | 776 | +10 mm |
| Seat tube length | 465mm | 525 | +60 mm |
| Fork length | 375mm | not listed | |
| Head tube length | 122mm | 175 | +53 mm |
| Effective top tube | not listed | 554 |
Differences are the Trek Domane SL Gen 2 Rim minus the Specialized Roubaix SL8 Sport. Full charts: 2024 Specialized Roubaix SL8 Sport, 2025 Trek Domane SL Gen 2 Rim.
Where each sits in its class
Specialized Roubaix SL8 SportTrek 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.
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