O'pen BIC Trailer wheels: inflation warning

O'pen BIC Trailer:

WARNING : The Max Inflation Pressure printed on the wheel of the O'pen BIC trolley is a maximum pressure, and must not be exceeded. Exceeding the pressure may result in failure of the wheel bladder, wheel structure, or both. Such failure may result in damage to your product and/or personal injury. If the trolley wheels are exposed to high temperatures or sun for even a short period of time, air pressure must be released so that the maximum pressure is not exceeded.