Question: can you patch z rated tires?
Answer: Can tires rated H (130 m.p.h.), V (more than 130 m.p.h.) or Z (more than 149 m.p.h.) be safely repaired? ... Most punctures can be repaired, and the tire returned to service, as long as the puncture is in the tread area. If the damage is in the shoulder or sidewall, however, replace the tire.