When changing and using bicycle inner tubes, pay attention to size matching, valve type, air pressure control, regular inspection, and replacement due to wear. Here are specific precautions:
Size Must Match: The inner tube size must be exactly the same as the outer tire and rim size; otherwise, it will cause installation difficulties or detachment during riding. Common sizes include 700×25C and 26×1.95, which need to be carefully checked.
Valveower Types: Bicycle inner tubes mainly come in two types: Schrader and Presta. Schrader valves are thicker and commonly used on mountain bikes; Presta valves are thinner and mostly used on road bikes. The pump must be compatible with the corresponding valve type.
Check Outer Tire and Rim Before Installation: When changing an inner tube, be sure to check the inside of the outer tire for any foreign objects such as glass or wire to avoid puncturing the new inner tube. Also check the tread for damage to prevent spokes from puncturing the inner tube.
Proper Installation to Prevent Tire Pinch: When installing the outer tire, do not use a tire pry bar to force it into the rear section, as this can easily trap the inner tube, leading to air leaks or blowouts. Inflate the inner tube slightly first to maintain its shape and facilitate installation.
Inflate to Recommended Tire Pressure: The tire pressure should refer to the range marked on the tire sidewall (e.g., 90–110 psi). Too high a pressure can cause a blowout, while too low a pressure increases rolling resistance and the risk of punctures. It is recommended to use an air pump with a pressure gauge for precise inflation.
Pay Attention to Inner Tube Aging: Even when not in use, inner tubes can slowly leak air due to rubber aging. It is generally recommended to replace them every 1–2 years, especially in high-temperature, sun-exposed environments where aging is more likely.
