Joystick Components, Binary 31.8, Stem, Black

The Joystick Components Binary 31.8 Stem in black is a premium CNC-machined mountain bike component designed for aggressive trail, all-mountain, and enduro riding. Built with a rugged, blocky look, this stem focuses on maximizing steering stiffness while keeping your cockpit profile low and clean. The "31.8" designation reflects Joystick's specialized product naming conventions, though the hardware features a modern oversize 35 mm handlebar clamp diameter paired with a 31.8 mm footprint style.

Component Specifications

• Handlebar Clamp Diameter: 35 mm (engineered for heavy-duty oversized handlebars).
• Length Variants: 35 mm or 50 mm options.
• Rise Angle: 0 degrees (keeps your bars flat and level).
• Stack Height: 40 mm (requires a shallow profile on your steerer tube).
• Material Architecture: Precision CNC-machined Aerospace Aluminum.
• Weight Profile: Roughly 125 grams (35 mm variant) to 154 grams (50 mm variant).

Core Mechanism & Design Features

• Wide Clamping Profile: Features an extra-wide faceplate design to spread clamping forces evenly across the handlebar. This eliminates pinpoint stress hotspots, making it fully safe to mount on lightweight carbon or alloy bars.
• Zero-Gap Faceplate: Utilizes a zero-gap top clamping arrangement. By torquing down the upper faceplate bolts flush before tightening the bottoms, it removes the guesswork out of installation.
• Knee-Friendly Geometry: Expert product reviews highlight that the steerer tube clamp features rounded, minimal sharp edges to prevent painful knee impacts during awkward crashes or hard maneuvers.