2024 Specialized Roubaix SL8 Expert 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 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 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 Expert 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 Expert 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 Expert. Full charts: 2024 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 | SRAM Rival eTAP AXS | not listed |
| Derailleur | SRAM Rival eTAP AXS | not listed |
| Cassette | SRAM XG1250 | not listed |
| Chain | SRAM Rival | not listed |
| Crankset | SRAM Rival AXS | not listed |
| Bottom bracket | SRAM DUB | not listed |
| Wheelset | Roval Terra C | not listed |
| Tire | Specialized S-Works Mondo 2BR | not listed |
| Brake | SRAM Rival | not listed |
| Handlebar | Specialized Hover Expert | not listed |
| Stem | Specialized Future | not listed |
| Seatpost | Specialized S-Works Pave Seat post | not listed |
| Saddle | Specialized Power Expert | not listed |
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