2023 Trek Domane SL Gen 4 vs 2025 Trek Domane AL 4 Gen 4

What changes on the Trek Domane AL 4 Gen 4

Compared with the Trek Domane SL Gen 4 in 54, the Trek Domane AL 4 Gen 4 in 58 places the top of the head tube 36 mm higher and 6 mm further forward, relative to the bottom bracket. Its wheelbase is 12 mm longer, which can contribute to stability at speed.

Frame stack

+36 mm

Higher front end

Frame reach

+6 mm

Longer frame reach

Wheelbase

+12 mm

Longer: steadier at speed

Head angle

+0.7°

Steeper: sharper steering

Chainstays

+5 mm

Longer: more planted

The two frames

We can't draw these frames yet. The Trek Domane SL Gen 4 numbers we have for size 54 are missing the seat angle. The numbers below still compare.

Geometry side by side

Differences are the Trek Domane AL 4 Gen 4 minus the Trek Domane SL Gen 4. Full charts: 2023 Trek Domane SL Gen 4, 2025 Trek Domane AL 4 Gen 4.

Where each sits in its class

Trek Domane SL 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.