Mountain Bike Handlebar Stem Riser Extension This mountain bike handlebar stem riser is constructed from high-strength aluminum alloy, offering durability, corrosion resistance, and long-lasting performance. It allows for adjustable height settings to help achieve a comfortable riding position. The design enables simple installation by attaching directly to the existing fork stem. Suitable for use on mountain bikes to raise the handlebar height. Installation Instructions: 1. Insert the riser onto the fork stem and add spacers to achieve the desired height. 2. Align the stem and wheel in the same direction, then securely tighten the stem clamping bolts. Specifications: - Type: Handlebar stem riser - Material: Aluminum alloy - Base diameter: 1 1/8" (28.6mm) - Diameter: 28.6mm (standard) - Total height: 120mm; 138mm (extended style) - Adjustable height: 70mm / 100mm - Includes: 4 spacers Package Includes: 1 x Bicycle stem ext