2025 Specialized Roubaix SL8 LTD vs 2027 Trek Domane AL 4 Gen 4
The 56 is the Trek Domane AL 4 Gen 4 size closest to your 54 Specialized Roubaix SL8 LTD. 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 AL 4 Gen 4
Compared with the Specialized Roubaix SL8 LTD in 54, the Trek Domane AL 4 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 13 mm longer, which can contribute to stability at speed.
- Frame stack
- +6 mm
- Higher front end
- Frame reach
- −4 mm
- Shorter frame reach
- Wheelbase
- +13 mm
- Longer: steadier at speed
- Head angle
- −0.4°
- Slacker: calmer steering
- Chainstays
- ±0 mm
- About the same
The two frames
Specialized Roubaix SL8 LTD, 54Trek Domane AL 4 Gen 4, 56Drawn to scale and lined up at the bottom bracket.
Geometry side by side
| Measurement | Specialized Roubaix SL8 LTD 54 | Trek Domane AL 4 Gen 4 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° | 73.3 | −0.7° |
| Effective top tube | 550mm | 554 | +4 mm |
| Chainstay length | 420mm | 420 | ±0 mm |
| Wheelbase | 1005mm | 1018 | +13 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 |
Differences are the Trek Domane AL 4 Gen 4 minus the Specialized Roubaix SL8 LTD. Full charts: 2025 Specialized Roubaix SL8 LTD, 2027 Trek Domane AL 4 Gen 4.
Where each sits in its class
Specialized Roubaix SL8 LTDTrek Domane AL 4 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 LTDS-Works SL8 LTD | Trek Domane AL 4 Gen 4Gen 4 |
|---|---|---|
| Fork | Specialized Future Shock 3.3 | Trek Domane AL |
| Shifter | SRAM Red AXS | Shimano Tiagra R4020 |
| Derailleur | SRAM Red AXS | Shimano Tiagra R4000, Shimano Tiagra 4700 |
| Cassette | SRAM RED XG-1290 | Shimano RS400 |
| Chain | SRAM RED | Shimano LG500 |
| Crankset | SRAM RED AXS Power Meter | Shimano Tiagra R4000 |
| Bottom bracket | SRAM DUB | Shimano RS501 |
| Wheelset | Roval Terra CLX II | Bontrager Paradigm 23 |
| Tire | Specialized S-Works Mondo 2BR | Bontrager Kwaremont |
| Brake | SRAM RED | not listed |
| Stem | Specialized S-Works Future | Bontrager Elite |
| Seatpost | Specialized S-Works Pave Seat post | Bontrager Comp |
| Saddle | Specialized S-Works Power | Trek Verse Short |
| Frame | not listed | Trek Domane AL |
| Chainring | not listed | Shimano Tiagra 4700 |
| Hub | not listed | Formula RX-142, Formula RX-512 |
| Rim | not listed | Bontrager Paradigm 23 |
| Rotor | not listed | Shimano SM-RT66 |
| Handlebar | not listed | Bontrager Comp |
| Bar tape | not listed | Bontrager Supertack Perf |
| Headset | not listed | Bontrager Expander Plug |
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