2027 Trek FX Sport SL vs 2026 Specialized Sirrus X 1.0

What changes on the Specialized Sirrus X 1.0

Compared with the Trek FX Sport SL in XS, the Specialized Sirrus X 1.0 in XXS places the top of the head tube 7 mm lower and 10 mm further back, relative to the bottom bracket. Its wheelbase is 11 mm shorter, which can contribute to quicker direction changes.

Frame stack

−7 mm

Lower front end

Frame reach

−10 mm

Shorter frame reach

Wheelbase

−11 mm

Shorter: quicker to change direction

Head angle

−0.5°

Slacker: calmer steering

Chainstays

−2 mm

About the same

The two frames

We can't draw these frames yet. The Trek FX Sport SL numbers we have for size XS are missing the seat angle. The numbers below still compare.

Geometry side by side

Differences are the Specialized Sirrus X 1.0 minus the Trek FX Sport SL. Full charts: 2027 Trek FX Sport SL, 2026 Specialized Sirrus X 1.0.

Where each sits in its class

Trek FX Sport SLSpecialized Sirrus X 1.0

Each bike is ranked against the other commuter 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.