Checking for damage to an electric bike inner tube can be done using the following steps to quickly locate the problem and avoid riding safety hazards:
Observe the Rate of Tire Pressure Drop: If the inner tube leaks noticeably or even deflates within a few hours, it is highly likely to be damaged. If the pressure drops slowly by only 0.1–0.2 bar per day, it may be due to an aging valve core or slow leakage, not necessarily a puncture.
Visual Inspection: Lift the wheel and slowly rotate the tire, carefully inspecting the inner tube surface for cracks, bulges, punctures, or exposed white steel wires. Pay special attention to whether there are nails, glass shards, or other foreign objects stuck in the tread grooves.
Water/Soap Water Test: After inflating the tire, apply soap water or directly splash water on suspected areas (such as the valve stem base, tread, and sidewall), and observe whether continuous bubbles appear. If bubbles emerge, it indicates a leak.
Water Immersion Test (Most Accurate):Remove the tire and completely immerse the inner tube in water, then slowly rotate it to observe. Any area where bubbles emerge indicates a puncture. This method can detect tiny pinholes or sand holes that are difficult to see with the naked eye.
Listening and Touch Assistance: Inflate the tire in a quiet environment and listen closely for a hissing sound indicating air leakage; or feel for airflow impact with your hand. This is especially useful for finding small leaks.
Check Repair History: If the inner tube has been repaired more than three times, its structural integrity is compromised. Even if it is not currently leaking, it is recommended to replace it to avoid sudden damage while riding.
