Designed for trail and all-mountain riders who demand precise, responsive handling, the PRO Tharsis 3Five CNC Stem is machined from a single block of AL-7050 alloy for exceptional stiffness and a direct connection between bar and fork. The oversized 35mm clamp matches the Tharsis 3Five handlebar range for a fully integrated cockpit with minimal flex.

Highlights

• CNC-machined AL-7050 alloy: single-piece construction delivers maximum rigidity and precise steering feedback on technical terrain.
• Oversized 35mm bar clamp: stiffer than 31.8mm setups, reducing flex under heavy braking and high-load cornering.
• 45mm compact length: keeps weight forward for quick, responsive steering — well suited to modern long, slack trail geometry.
• 0-degree rise: maintains a low, aggressive front-end position for riders who favour an assertive riding stance.
• Matched to Tharsis 3Five cockpit: designed to be paired with PRO Tharsis 3Five 35mm handlebars for a cohesive, optimised front end.
• Clean matte black finish: understated aesthetic that complements a wide range of build colours.

Precision machining for trail performance

The Tharsis 3Five CNC is built around CNC-machined AL-7050 alloy — a high-strength aluminium used across PRO's performance component range. Machined construction, rather than forged or cast, delivers tighter tolerances and a stiffer structure, translating rider input directly through to the front wheel with minimal energy loss. On rough descents and technical climbs, that stiffness is felt as sharper, more predictable handling.

The 35mm advantage

The oversized 35mm bar clamp diameter is central to the Tharsis 3Five platform. Compared to the conventional 31.8mm standard, the larger clamp area reduces localised stress on the bar, increases the system's torsional stiffness, and allows the use of lighter bar walls without sacrificing strength. This stem is part of a purpose-built system — pair it with a PRO Tharsis 3Five 35mm handlebar for the full benefit.

Compatibility & fit

Fits 1-1/8" (28.6mm) standard steerer tubes. Bar clamp diameter is 35mm — this stem is not compatible with 31.8mm handlebars. Available in 35mm, 45mm, and 55mm lengths, all at 0 degrees. The 45mm length suits modern trail and all-mountain builds where reach is managed via frame geometry rather than stem length.