A technician is inspecting a vehicle with a slow tire leak. They locate a small nail embedded in the tread area, approximately 1.5 inches from the sidewall. The tire's speed rating is H, and its load index is 91. According to RMA (Rubber Manufacturers Association) guidelines, can this tire be safely repaired?
- AYes, but only if the tire's speed rating was V or higher.
- BNo, because the tire's load index is too low for a safe repair.
- CYes, because the puncture is within the repairable area of the tread.
- DNo, because the puncture is too close to the sidewall.
Show answer & explanationAnswer & explanation
Correct answer: D. No, because the puncture is too close to the sidewall.
RMA guidelines specify that a puncture in a passenger, light truck, or medium truck tire is repairable only if it is within the tread area and no closer than 1/2 inch from the shoulder block, or 1 inch from the sidewall. A puncture 1.5 inches from the sidewall is generally considered too close to the unrepairable shoulder/sidewall zone for most passenger tires, as the flexing in this area can compromise the repair.
Why the other options are wrong
- A. Speed rating does not determine the repairability of a puncture location, only the maximum safe speed of the tire.
- B. Load index does not determine the repairability of a puncture location, only the maximum load capacity of the tire.
- C. 1.5 inches from the sidewall is typically outside the safe repairable area for most passenger tires according to RMA guidelines, which often limit repairs to the center tread and away from the shoulder/sidewall flex zone.
RMA Tire Repairable Area
RMA guidelines define the repairable area for punctures as the tread face, typically excluding the shoulder and sidewall areas due to high flex and stress that can compromise a plug/patch repair.
- Limited to tread area
- Excludes shoulder and sidewall
- Specific distance from sidewall/shoulder (e.g., 1 inch from sidewall for passenger tires)
Memory trick: Tread is fair game, but the shoulder and sidewall tell a different tale.