2024 Specialized Roubaix SL8 vs 2025 Trek Domane AL 4 Gen 4

What changes on the Trek Domane AL 4 Gen 4

Compared with the Specialized Roubaix SL8 in 54, the Trek Domane AL 4 Gen 4 in 49 places the top of the head tube 45 mm lower and 13 mm further back, relative to the bottom bracket. Its wheelbase is 4 mm shorter, which can contribute to quicker direction changes.

Frame stack

−45 mm

Lower front end

Frame reach

−13 mm

Shorter frame reach

Wheelbase

−4 mm

Shorter: quicker to change direction

Head angle

−1.5°

Slacker: calmer steering

Chainstays

+5 mm

Longer: more planted

The two frames

Only the Specialized Roubaix SL8 is drawn. The Trek Domane AL 4 Gen 4 numbers we have for size 49 are missing the seat angle.

Geometry side by side

Differences are the Trek Domane AL 4 Gen 4 minus the Specialized Roubaix SL8. Full charts: 2024 Specialized Roubaix SL8, 2025 Trek Domane AL 4 Gen 4.

Where each sits in its class

Specialized Roubaix SL8Trek 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.