The PRO Tharsis 3Five CNC stem is built for trail and all-mountain riders who demand a stiff, direct connection between bar and fork. Machined from a single block of 7050 aluminium alloy, the 40mm length and oversized 35mm clamp combine to deliver confident, precise steering through technical terrain.

Highlights

• 35mm oversized clamp: part of PRO's 3Five cockpit system — stiffer and more controlled than a standard 31.8mm interface under hard cornering and braking.
• CNC machined 7050 aluminium: milled from a single block for exceptional strength-to-weight and consistent dimensional precision.
• Short 40mm length: sharpens steering response for technical trail riding and aggressive all-mountain geometry.
• 0 degree angle: neutral rise keeps bar position clean and predictable.
• 4-bolt removable faceplate: secure bar clamping with easy installation and bar swaps.
• Clean black anodised finish: durable, low-profile finish suited to modern trail and enduro builds.

Built for stiffness and control

The 35mm clamping diameter spreads load over a larger contact area than a traditional 31.8mm interface, reducing flex under hard inputs. Paired with the short 40mm length, the result is a front end that communicates clearly and holds a line when the trail gets loose and fast. The stem is designed to be used as part of PRO's wider Tharsis 3Five cockpit system alongside a 35mm handlebar.

Precision construction

Each stem body is CNC machined from a single billet of 7050 aluminium — a high-strength alloy selected for its stiffness and durability. The 4-bolt removable faceplate clamps the bar evenly and makes fitting or swapping bars straightforward. The anodised black finish is hardwearing and resistant to trail grime.

Compatibility & Fit

The Tharsis 3Five CNC stem fits a standard 1-1/8 inch (28.6mm) threadless steerer tube and accepts 35mm diameter handlebars only — it is not compatible with 31.8mm bars. Length: 40mm. Rise: 0 degrees. Best paired with a PRO Tharsis 3Five 35mm handlebar for a matched, fully engineered cockpit.