2026 Trek Domane AL Gen 4 vs 2027 Trek Domane AL 4 Gen 4
The Trek Domane AL 4 Gen 4 size closest to your 54 is the 54. Compare the 54 instead
What changes on the Trek Domane AL 4 Gen 4
Compared with the Trek Domane AL Gen 4 in 54, the Trek Domane AL 4 Gen 4 in 56 places the top of the head tube 16 mm higher and 3 mm further forward, relative to the bottom bracket. Its wheelbase is 8 mm longer, which can contribute to stability at speed.
- Frame stack
- +16 mm
- Higher front end
- Frame reach
- +3 mm
- Longer frame reach
- Wheelbase
- +8 mm
- Longer: steadier at speed
- Head angle
- +0.6°
- Steeper: sharper steering
- Chainstays
- ±0 mm
- About the same
The two frames
Trek Domane AL Gen 4, 54Trek Domane AL 4 Gen 4, 56Drawn to scale and lined up at the bottom bracket.
Geometry side by side
| Measurement | Trek Domane AL Gen 4 54 | Trek Domane AL 4 Gen 4 56 | Difference |
|---|---|---|---|
| Reach | 374 | 377 | +3 mm |
| Stack | 575 | 591 | +16 mm |
| Head tube angle | 71.3 | 71.9 | +0.6° |
| Seat tube angle | 73.7 | 73.3 | −0.4° |
| Effective top tube | 542 | 554 | +12 mm |
| Chainstay length | 420 | 420 | ±0 mm |
| Wheelbase | 1010 | 1018 | +8 mm |
| BB drop | 80 | 78 | −2 mm |
| Standover | 754 | 776 | +22 mm |
| Seat tube length | 500 | 525 | +25 mm |
| Head tube length | 160 | 175 | +15 mm |
Differences are the Trek Domane AL 4 Gen 4 minus the Trek Domane AL Gen 4. Full charts: 2026 Trek Domane AL Gen 4, 2027 Trek Domane AL 4 Gen 4.
Where each sits in its class
Trek Domane AL Gen 4Trek 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 AL Gen 4AL 2 Gen 4 | Trek Domane AL 4 Gen 4Gen 4 |
|---|---|---|
| Frame | Trek Domane AL | Trek Domane AL |
| Fork | Trek Domane AL | Trek Domane AL |
| Shifter | Shimano Claris R2000 | Shimano Tiagra R4020 |
| Derailleur | Shimano Claris R2000 | Shimano Tiagra R4000, Shimano Tiagra 4700 |
| Cassette | Shimano HG31 | Shimano RS400 |
| Chain | Shimano HG71 | Shimano LG500 |
| Crankset | Shimano Claris R2000 | Shimano Tiagra R4000 |
| Bottom bracket | Shimano UN300 | Shimano RS501 |
| Wheelset | Bontrager Paradigm 23 | Bontrager Paradigm 23 |
| Tire | Bontrager Kwaremont Comp, Bontrager R1 | Bontrager Kwaremont |
| Brake | Tektro MD-C550, Tektro C550 | not listed |
| Rotor | Tektro Wave | Shimano SM-RT66 |
| Handlebar | Bontrager Comp | Bontrager Comp |
| Stem | Bontrager Elite | Bontrager Elite |
| Grips | Not specified | not listed |
| Headset | Integrated, cartridge bearing | Bontrager Expander Plug |
| Seatpost | Bontrager Comp | Bontrager Comp |
| Saddle | Bontrager Verse Short | Trek Verse Short |
| Chainring | not listed | Shimano Tiagra 4700 |
| Hub | not listed | Formula RX-142, Formula RX-512 |
| Rim | not listed | Bontrager Paradigm 23 |
| Bar tape | not listed | Bontrager Supertack Perf |
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