ELEVN 31.8mm Overbite Stem 1-1/8"

Product Overview

The ELEVN Overbite Stem is an oversized BMX race stem designed for riders using 31.8mm handlebars and 1-1/8" steerer tube forks. CNC-machined from 6061-T6 aluminum and equipped with six titanium bolts, this stem delivers increased stiffness and reduced weight compared to traditional 22.2mm BMX stems. The oversized 31.8mm bar clamp area provides a more rigid connection between bars and fork, improving front-end responsiveness for racing applications.

Key Features

• 31.8mm Oversized Bar Clamp – Larger clamp diameter creates a stiffer interface between handlebars and stem, reducing flex during hard accelerations, jumps, and aggressive cornering
• 6061-T6 CNC-Machined Aluminum – High-strength alloy construction with precision machining ensures strength while minimizing material and weight
• Six Titanium Tapered-Head Bolts – Titanium hardware (M8 x 25 x 1.25) significantly reduces weight compared to steel bolts without sacrificing clamping strength
• 33mm Low Stack Height – Shorter steerer tube stack allows for lower bar positioning and reduces overall cockpit height
• 29.93mm Stem Rise – Distance from bar center to stem bottom provides consistent geometry across all reach lengths

Technical Specifications

• Bar Clamp Diameter: 31.8mm (oversized—requires 31.8mm handlebars)
• Steerer Tube Diameter: 1-1/8" only
• Material: 6061-T6 aluminum alloy
• Clamping Type: Top load
• Bolt Material: Titanium (6 bolts, M8 x 25 x 1.25 thread)
• Stack Height: 33mm
• Stem Rise: 29.93mm
• Available Lengths: 45mm, 50mm, 53mm, 57mm, 60mm
• Color Options: Anodized Black, Polish, Red, Blue
• Weight: 45mm (229g / 8.1oz) | 50mm (249g / 8.7oz) | 53mm (259g / 9.1oz) | 57mm (269g / 9.4oz) | 60mm (277g / 9.7oz)
• Maximum Torque: 13Nm

Compatibility and Ideal Use Cases

Compatibility Requirements: This stem requires 31.8mm oversized handlebars and a 1-1/8" steerer tube fork. It is not compatible with standard 22.2mm BMX bars or 1" steerer tubes. Verify your handlebar and fork specifications before purchasing.

Designed specifically for BMX racing where stiffness and weight are critical performance factors. The oversized clamp provides noticeable improvement in front-end rigidity during sprints, gate starts, and technical sections where precise steering input matters. Best suited for competitive racers and serious riders who have upgraded to 31.8mm handlebars and modern 1-1/8" steerer forks. The range of lengths allows riders to dial in their cockpit reach for optimal body position and bike handling.