What’s different about the frame compared to the previous version?
Advanced tube shaping for high-end looks and ride quality.
Hidden cable and hose routing through the headtube.
Trek’s first road bike with UDH (Universal Derailleur Hanger).
Domane AL Gen 4 FAQ
Frame Details
Does the Domane AL Rim frame get any changes?
No – that is a carry-forward frame.
What is the geometry?
Endurance geometry, same as the Domane AL Gen 3.
Does the frame have internal storage?
No – internal storage is a Domane carbon-only feature.
How about mudguard and rack mounts?
The Domane AL Gen 4 has hidden mudguard mounts, rack mounts and a top-tube bag mount. Hidden mudguard mount hardware part numbers can be found in the Domane AL Gen 4 service manual.
Parts Compatibility
What is the brake mount and max rotor size?
Flat mount, up to 160 mm both front and rear.
What is the hub spacing?
100x12 mm front, 142x12 mm rear with a swanky new UDH-compatible countersunk thru-axle.
What type of bottom bracket?
BSA threaded 68 mm
Is the bottom bracket compatible with 30 mm spindle cranks?
No.
Max chainring size?
2x: 50/34
1x: 50T
Is that a round seat post?
Yes – Domane AL Gen 4 uses a standard 27.2 mm round seat post.
Is it compatible with the Madone SLR bar/stem?
No – the Madone SLR bar/stem’s profile will not interface correctly with the standard round headset cover used on Domane AL.
Okay, fine. What about the RCS Pro stem?
Yes! You’ll just need a compatible headset cover (W5274267) and spacers (41357).
Spec Details
Are those new handlebars?
Good eye! Yes, the Domane AL Gen 4 comes with all-new Bontrager Comp alloy handlebars that feature a shorter reach measurement (80 mm), slightly shallower drop (121 mm) and a 4 mm total flare at the drops (2 mm per side). Look at the Spec section on each bike’s Trekbikes.com page to see which bar is spec’d with which size bike.
Are the wheels tubeless-compatible? What additional parts are required?
The wheels are tubeless-compatible, but the tyres and rim strips are not. To convert to tubeless, you’ll need to purchase tubeless ready tyres, rim strips, valves and sealant.