If you find that your tire is punctured, then you need to carefully consider if it is safe to simply repair is or whether it needs to be replaced. If punctures have appeared on more than one tire, investigate them further. If you find that they are less than 6 millimetres deep, then they should be fine with repairs. If the puncture is more than 6 millimetres deep, then the tire must be replaced. Also, if there are several punctures too close to each other where repairs would overlap, opting for new tires is the best idea.