Note: 1. Like other bicycle inner tubes, we do not recommend charging the TPU inner tube with too much air pressure without the tires and rims, resulting in irreversible damage to the inner tube. Because the thickness of the TPU inner tube is very thin (only 0.2-0.3mm), although it has higher strength and toughness than other rubber inner tubes, it is still impossible to avoid deformation in the case of empty beating (directly inflating the inner tube without assembly between the outer tire and the rim), so we recommend that when assembling the TPU inner tube, As long as the air pressure of 0.5-1.0PSI is first driven, the position between the inner tube and the outer tire and the rim is adjusted, and the inner tube is not broken and fully fitted, and then the air is pumped. 2. High temperature is the natural enemy of TPU (thermoplastic polyurethane elastomer material), in rare cases the rim brake will overheat the rim, reaching extremely high temperatures, resulting in potential safety issues, in order to ensure the complete safety of the rider, we recommend only using TPU inner tubes on bicycles equipped with disc brakes.