2025 Trek Domane SL Gen 2 Rim vs 2027 Trek Domane AL 4 Gen 4
The 56 is the Trek Domane AL 4 Gen 4 size closest to your 56 Trek Domane SL Gen 2 Rim. 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 Trek Domane SL Gen 2 Rim in 56, the Trek Domane AL 4 Gen 4 in 56 places the top of the head tube at about the same height and about as far forward, relative to the bottom bracket. Its wheelbase is 10 mm longer, which can contribute to stability at speed.
- Frame stack
- ±0 mm
- About the same height
- Frame reach
- ±0 mm
- About the same reach
- Wheelbase
- +10 mm
- Longer: steadier at speed
- Head angle
- ±0.0°
- About the same head angle
- Chainstays
- ±0 mm
- About the same
The two frames
We can't draw these frames yet. The Trek Domane SL Gen 2 Rim numbers we have for size 56 are missing the seat angle. The numbers below still compare.
Geometry side by side
| Measurement | Trek Domane SL Gen 2 Rim 56 | Trek Domane AL 4 Gen 4 56 | Difference |
|---|---|---|---|
| Reach | 377 | 377 | ±0 mm |
| Stack | 591 | 591 | ±0 mm |
| Head tube angle | 71.9° | 71.9 | ±0.0° |
| Effective top tube | 554 | 554 | ±0 mm |
| Chainstay length | 420 | 420 | ±0 mm |
| Wheelbase | 1008 | 1018 | +10 mm |
| BB drop | 78 | 78 | ±0 mm |
| Standover | 776 | 776 | ±0 mm |
| Seat tube length | 525 | 525 | ±0 mm |
| Head tube length | 175 | 175 | ±0 mm |
| Seat tube angle | not listed | 73.3 |
Differences are the Trek Domane AL 4 Gen 4 minus the Trek Domane SL Gen 2 Rim. Full charts: 2025 Trek Domane SL Gen 2 Rim, 2027 Trek Domane AL 4 Gen 4.
Where each sits in its class
Trek Domane SL Gen 2 RimTrek 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 | Trek Domane SL Gen 2 Rim | Trek Domane AL 4 Gen 4Gen 4 |
|---|---|---|
| Frame | not listed | Trek Domane AL |
| Fork | not listed | Trek Domane AL |
| Shifter | not listed | Shimano Tiagra R4020 |
| Derailleur | not listed | Shimano Tiagra R4000, Shimano Tiagra 4700 |
| Cassette | not listed | Shimano RS400 |
| Chain | not listed | Shimano LG500 |
| Crankset | not listed | Shimano Tiagra R4000 |
| Chainring | not listed | Shimano Tiagra 4700 |
| Bottom bracket | not listed | Shimano RS501 |
| Wheelset | not listed | Bontrager Paradigm 23 |
| Tire | not listed | Bontrager Kwaremont |
| 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 |
| Stem | not listed | Bontrager Elite |
| Bar tape | not listed | Bontrager Supertack Perf |
| Headset | not listed | Bontrager Expander Plug |
| Seatpost | not listed | Bontrager Comp |
| Saddle | not listed | Trek Verse Short |
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