Therefore, their policy is that a punctured and repaired tire no longer retains its speed rating and should be treated as a non-speed rated tire. Repair of larger tread punctures and of punctures to the tire's shoulder and sidewall areas are not recommended. Obviously, a few of the items pulled from tires shown in the photo to the right will result in a puncture that can't be repaired. There are three primary considerations when repairing a punctured tire. You need to evaluate the damage the object caused as it punctured the tire, reestablish an airtight seal of the tire's innerliner, and completely fill the path the object took through the tire.
Any repair done without removing the tire from the wheel is improper.
Without inspecting the inside of the tire for hidden damage comes the risk of returning a weakened tire to service. Punctures in the tread area that looked repairable have revealed upon further investigation that the object that punctured the tire had been long enough to cut the tire's sidewall from the inside. Without dismounting the tire, the hidden damage would have been missed. There are many different rubber compounds used in a tire. The tire's innerliner uses a special rubber compound that has the ability to better retain air.