https://www.rma.org/publications/tire_service_professionals/index.cfm?PublicationID=11303
The site listed above is the Rubber MAnufacturers Association. I have worked in 2 shops over the past 3 years.
You CAN safely repair a speed rated tire, and any other Radial Tire up to load range E. I...
Michelin X Radial Is an Excellent Tire for all season. Good amount of sipes, as well as wide and Deep Circumferential grooves. Only drawback I can state, the price. But when compared to other top of the line tires, they're not too far off.