2025 Specialized Demo Race vs 2023 Trek Session C 27.5 Frameset

What changes on the Trek Session C 27.5 Frameset

Compared with the Specialized Demo Race in S3, the Trek Session C 27.5 Frameset in M places the top of the head tube 16 mm lower and 17 mm further back, relative to the bottom bracket. Its wheelbase is 29 mm shorter, which can contribute to quicker direction changes.

Frame stack

−16 mm

Lower front end

Frame reach

−17 mm

Shorter frame reach

Wheelbase

−29 mm

Shorter: quicker to change direction

Head angle

+0.7°

Steeper: sharper steering

Chainstays

−3 mm

Shorter: livelier

The two frames

Only the Specialized Demo Race is drawn. The Trek Session C 27.5 Frameset numbers we have for size M are missing the seat angle.

Geometry side by side

Differences are the Trek Session C 27.5 Frameset minus the Specialized Demo Race. Full charts: 2025 Specialized Demo Race, 2023 Trek Session C 27.5 Frameset.

Where each sits in its class

Specialized Demo RaceTrek Session C 27.5 Frameset

Each bike is ranked against the other downhill 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.