bicycle mirror arm

Robust Bicycle Mirror Extension Arm (23.5mm Handlebar)

Description

This bicycle mirror mount has been designed to offer maximum visibility and great durability. Unlike standard models, which are often too fragile, this version emphasizes structural strength at the clamping collar and the offset arm.

The collar is specifically sized for handlebars of 23.5 mm in diameter, providing a firm fit with a slight functional play to prevent cracking during tightening.

Technical Specifications

• Handlebar Diameter: 23.5 mm (Standard MTB/City).
• Arm Length: ~115 mm diagonally for optimal offset.
• Collar Thickness: 6 mm of solid plastic for maximum rigidity.
• Clamping System: Fixed by 2 through-screws with integrated recesses for screw heads and nuts.

Required Hardware

For assembly, you will need:

• 2x M4 Screws (Recommended length: 16mm to 20mm).
• 2x M4 Nuts (Standard hexagonal).
• Optional: 4x M4 Washers for better pressure distribution.

Recommended Printing Parameters (Tested)

To ensure the arm does not break with vibrations or wind, use these settings:

• Material: PETG recommended (more UV and impact resistant than PLA), or ASA/ABS.
• Number of Walls: 4 minimum.
• Infill: 30% or more.
• Infill Pattern: Gyroid (for equal strength in all directions).
• Supports: Yes (Tree supports recommended).
• Layer Height: 0.20 mm.

Assembly Instructions

1. Carefully remove the tree supports.
2. Place the two half-shells around your handlebar.
3. Insert the nuts into the designated recesses (one side is designed to lock the nut).
4. Gradually tighten the M4 screws on each side to balance the pressure.

Note: The model has been reinforced at the base of the arm and the material thickness under the screw head has been increased to 5 mm to prevent any cracking during vigorous tightening.