The air pressure level should be selected depending on the weight of the rider and the way the tires are used. Generally speaking, lighter riders require less pressure, heavier riders more. We usually recommend choosing a pressure level somewhere between the recommended and the maximum pressure. The maximum tire pressure indicated on the side of the tire may not be exceeded. Tires that are pumped up too much will tend to crack. Wide tires need less pressure than narrow tires. If the pressure is too low, there is a risk that the tire will be crushed if driven over a sharp edge, e.g. a hole in the road or a lowered pavement. Therefore, check and set the pressure correctly on a regular basis.