KENDA Bicycle Inner Tube User Manual

1. Product Overview

This manual provides essential information for all KENDA bicycle inner tubes made from butyl rubber, available in various sizes. It covers installation procedures, operational guidelines, safety precautions, and compliance information to ensure safe and effective use of the product.

For additional details, you may refer to the official user manual PDF: KENDA Bicycle Inner Tube User Manual (PDF).

2. Specifications

KENDA inner tubes are manufactured with advanced butyl rubber, offering superior air tightness compared to natural rubber (1/7) and general styrene-butadiene rubber (1/5).

3. Setup and Installation

3.1 Identifying the Correct Inner Tube

Before installation, it is crucial to select the correct inner tube size and valve type/length that matches your tire and rim. Refer to the markings on your existing tire and rim.

3.2 Valve Types and Lengths

KENDA inner tubes are available with American Valve (AV) and French Valve (FV) options, each with various stem lengths to accommodate different rim depths.

3.3 Installation Steps

1. Check Compatibility: Confirm that the inner tube size (e.g., 700x23C-28C) matches the size marked on your bicycle tire.
2. Prepare Rim: Clean the rim surface thoroughly. Install rim tape to cover spoke holes and prevent sharp edges from damaging the inner tube.
3. Place Inner Tube: Slightly inflate the inner tube to give it shape. Carefully place it inside the tire, ensuring it is not twisted or pinched between the tire bead and the rim.
4. Mount Tire: Install the tire onto the rim. Gradually inflate the tire to the rated pressure, which is typically marked on the tire sidewall. Continuously check for any signs of the inner tube pinching during inflation.

4. Operating Instructions

• Inflation Pressure: Always inflate the inner tube strictly according to the rated pressure marked on the tire sidewall. Do not over-inflate or under-inflate, as this can lead to tire failure or damage.
• Regular Checks: Regularly inspect the inner tube and tire for any signs of air leaks, punctures, or valve damage. Replace any damaged inner tubes immediately to ensure safe riding.

5. Maintenance and Storage

• Cleaning: After use, clean the inner tube with clean water and dry it thoroughly in a cool, well-ventilated area, away from direct sunlight.
• Storage: Store inner tubes in a dry, cool, dark environment. Keep them away from oils, chemicals, and sharp objects that could cause damage.
• Replacement: Replace inner tubes regularly based on usage frequency and signs of aging or wear to maintain optimal performance and safety.

6. Troubleshooting

6.1 Common Issues

• Air Loss After Installation: If the inner tube loses air shortly after installation, check for the following:
  • Ensure the inner tube is correctly seated and not pinched between the tire bead and the rim.
  • Verify that the rim tape is properly installed and covers all spoke holes, preventing sharp edges from puncturing the tube.
  • Inspect the valve stem for any damage or improper seating that might cause leaks.
  • Check the tire itself for any embedded sharp objects that could be causing repeated punctures.
• Difficulty Inflating: Ensure the valve core is properly tightened (for Presta valves, unscrew the top nut before inflating) and that your pump is compatible with the valve type.

7. User Tips

• Many users find these inner tubes reliable for 700x32 tires, indicating good compatibility within the specified range.
• Always carry a spare inner tube and a tire lever (one is often included with the product) for roadside repairs.
• When installing, a slight pre-inflation of the tube helps prevent pinching.

8. Safety Information and Limitations

8.1 Warnings

• Over-inflation Hazard: Over-inflating the inner tube can cause a sudden tire blowout, leading to loss of control and serious injury. Always adhere to the rated pressure.
• Improper Installation: Incorrect installation, such as a twisted or pinched tube, can cause tire failure during riding. Ensure correct installation or seek professional assistance.
• Pre-Ride Inspection: Always inspect the inner tube and tire before each ride. Do not ride with damaged components to prevent accidents.
• Keep Away from Children: Keep inner tubes out of reach of children to prevent choking or injury from improper handling.
• Heat and Flame Exposure: Do not expose the inner tube to open flames or high temperatures. This can cause melting, bursting, or fire hazards.

8.2 Usage Limitations

• Do not use inner tubes that do not match the tire/rim size. Mismatched sizes can lead to blowouts or poor sealing.
• Do not use damaged, cracked, or aged inner tubes. Severely damaged tubes should not be repaired or reused.
• This product is designed for ordinary bicycle use only. It is not suitable for electric bicycles, motorcycles, or extreme riding conditions.

9. Compliance Marking

This product bears the CE mark, indicating compliance with EU safety regulations and relevant standards for bicycle accessories.

9.1 Applicable Regulations and Harmonized Standards

• EU Regulation: (EU) 2023/931 (General Product Safety Regulation)
• Harmonized Standard: EN 14764:2005+A1:2008 (Cycles - Safety requirements for bicycles)
• International Standard: ISO 4210:2016 (Cycles - Safety requirements for bicycles)
• Material Standard: EN 14350-1:2004 (Rubber materials for bicycle accessories)

10. Warranty and Support

For any questions, concerns, or support regarding your KENDA bicycle inner tube, please contact the seller or manufacturer directly. Keep your purchase records for potential warranty claims.