Introduction
This manual provides essential information for the safe and correct installation, operation, and maintenance of your BRIDGESTONE Cycle Back Mirror TYPE1 BM-SP4. Please read these instructions thoroughly before use and retain them for future reference.
Product Features
- Head Shape: TYPE1 (Round)
- Lens: 80mm diameter, 1200R convex curved mirror for a wide and stable field of view.
- Adjustability: Ball joint allows for wide-range angle adjustment.
- Handlebar Protection: Features a resin band to prevent damage to the handlebar during installation.
- Versatility: Can be mounted on either the left or right side of the handlebar.
Package Contents
Verify that all components are present in the package:
- BRIDGESTONE Cycle Back Mirror TYPE1 BM-SP4 (1 unit)
Safety Information
- Always ensure the mirror is securely fastened before riding. A loose mirror can cause distraction or fall off.
- While the mirror provides a rear view, always perform a head check before changing lanes or turning to confirm your surroundings.
- Do not overtighten the mounting screw, as this may damage the handlebar or the mirror's mounting band.
- Regularly inspect the mirror for any damage or loose parts. Replace if necessary.
Setup and Installation
Follow these steps to install the mirror on your bicycle handlebar:
- Identify Mounting Location: Choose a suitable location on your handlebar (left or right side) that provides an unobstructed view to the rear. Ensure the handlebar diameter is compatible (φ22.2mm).
- Loosen Clamp: Using an appropriate tool, slightly loosen the bolt on the mirror's handlebar clamp.
- Position Mirror: Carefully place the open clamp around the chosen section of your handlebar. The resin band should be in direct contact with the handlebar.
- Secure Clamp: Tighten the clamp bolt until the mirror is firmly secured and does not rotate freely. Do not overtighten. The mirror should be stable but allow for minor adjustments if bumped.
- Initial Adjustment: Adjust the mirror head using the ball joint to achieve your desired rear view. Ensure the view is clear and covers the necessary area behind you.

Image: Close-up view of the mirror's handlebar clamp, showing the resin band and the tightening bolt. This clamp is designed to fit around a bicycle handlebar.

Image: The BRIDGESTONE Cycle Back Mirror TYPE1, showing its round mirror head and arm, securely mounted on a bicycle handlebar. The mirror is positioned for rear visibility.
Operating Instructions
The BRIDGESTONE Cycle Back Mirror TYPE1 is designed for simple, manual operation.
- Angle Adjustment: The mirror features a ball joint mechanism. To adjust the viewing angle, gently grasp the mirror head and pivot it to the desired position. The ball joint allows for fine-tuning to optimize your rear visibility.
- Convex Mirror: The 1200R convex mirror provides a wider field of view compared to flat mirrors. Objects in the mirror will appear smaller and further away than they actually are. Use caution and verify distances visually when necessary.
Maintenance
- Cleaning: Clean the mirror surface with a soft, damp cloth. For stubborn dirt, use a mild soap solution and then wipe dry. Avoid abrasive cleaners or materials that could scratch the glass.
- Inspection: Periodically check all parts of the mirror for tightness and damage. Ensure the handlebar clamp is secure and the ball joint moves smoothly without excessive looseness.
- Storage: If storing your bicycle for an extended period, consider covering the mirror to protect it from dust and environmental elements.
Troubleshooting
| Issue | Possible Cause | Solution |
|---|---|---|
| Mirror is loose or rotates easily. | Handlebar clamp is not tight enough. | Tighten the clamp bolt securely. Ensure the resin band is properly seated. |
| View is blurry or distorted. | Mirror surface is dirty or scratched. | Clean the mirror surface. If scratched, consider replacing the mirror. |
| Cannot achieve desired viewing angle. | Mirror arm or head is obstructed. | Adjust the position of the mirror on the handlebar or re-evaluate the mounting location. |
Specifications
| Feature | Detail |
|---|---|
| Model Number | BM-SP4 A510131BL |
| Head Shape | TYPE1 (Round) |
| Lens Diameter | 80mm |
| Lens Curvature | 1200R Convex |
| Weight | Approx. 145g (0.15 kg) |
| Color | Black |
| Materials | Arm: Steel, Base: PP, Mirror Surface: Glass, Band: Nylon |
| Compatible Handlebar Diameter | φ22.2mm |
| Mounting Type | Handlebar Clamp |
| Operation Mode | Manual |
Warranty and Support
For warranty information or technical support, please refer to the documentation provided with your purchase or contact BRIDGESTONE customer service directly. Keep your proof of purchase for warranty claims.