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 M, the Specialized Sirrus X 1.0 in XL places the top of the head tube 39 mm higher and 21 mm further forward, relative to the bottom bracket. Its wheelbase is 31 mm longer, which can contribute to stability at speed.

Frame stack

+39 mm

Higher front end

Frame reach

+21 mm

Longer frame reach

Wheelbase

+31 mm

Longer: steadier at speed

Head angle

±0.0°

About the same head angle

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 M 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.