Tire Rack.com

Flat Tire Repairs’ Effect on Speed Rating


Lea esta página en español

How Slow Do You Have to Go?

The origin of tire speed ratings can be traced to Europe where they were needed to match high-speed tire durability with the unlimited vehicle speeds permitted on roadways like the German Autobahn. And even though the highest speed limit in the United States is 80 mph, speed-rated tires have become commonplace here due to the many vehicle models being sold globally.

Speed-rated tires use tire compounds able to withstand the anticipated speeds and add internal structural reinforcements to strengthen, stabilize and control the tire’s shape as it rolls. Higher speeds require more capable compounds and stronger structural reinforcements.

Unfortunately even the strongest compound or internal reinforcement can’t prevent small screws, sharp nails or accident debris from piercing through the rubber compound and between the steel belts and fabric cords leaving the driver with a slow leak or a flat tire. Now comes the need for repair and this is where the tire manufacturers have different policies.

Rubber Manufacturers Association (RMA) Policies

The RMA is an industry association whose membership includes most major domestic and foreign manufacturers selling tires in the United States. The RMA collectively establishes the foundation of industry policies, from which the tire manufacturers can specify their company’s exact position.

The RMA makes available training presentations and workshop posters to assist tire technicians with the steps necessary to properly repair tires. Each tire manufacturer specifies RMA tire repair procedures must be followed precisely to have any tire repair deemed proper.

The RMA’s stand on puncture repairs is as follows:

Industry AssociationSpeed RatingMultiple Repair Locations
Rubber Manufacturers Assoc.
(RMA)
As per manufacturerRepairs cannot overlap.
Some manufacturers specify
greater spacing.

While RMA establishes industry standards, their procedures are superseded by any policies and detailed instructions made by the tire manufacturers.

Tire Manufacturer Policies

A few tire manufacturers allow a punctured tire to retain its speed rating when returned to service if it can successfully pass a thorough exterior / interior inspection and be repaired following the Rubber Manufacturers Association (RMA) specified multi-step procedure.

Several other manufacturers specify their highest speed-rated tires (originally V-, Z-, W- or Y-speed rated) can be driven no faster than the 130 mph speeds permitted of a lower H-speed rating.

However, most tire manufacturers reason that since they have no control over the severity of the damage caused by the puncture, the destructive stresses encountered if the tire was driven while underinflated/flat or the quality of the repair itself, they cannot confirm if the tire has retained its full integrity or high-speed capability. Therefore, most tire manufacturers have established policies that a punctured and repaired tire no longer retains its speed rating and should be treated as a non-speed rated tire driven no faster than 85 mph.

Finally, a few tire manufacturers recommend outright tire replacement, as they will not accept repaired tires for warranty consideration or do not endorse repair of V-, Z-, W- or Y-speed rated tires

A summary of tire manufacturer speed-rated tire repair policies are listed below:

Tire Manufacturer’s Puncture Repair Recommendations

Manufacturer/BrandSpeed RatingMultiple Repair Locations
BFGoodrich*Maintained3 repairs, minimum 90° apart*
Bridgestone**VoidedRepairs cannot overlap
Continental*** VoidedRepairs cannot overlap
Dick Cepek/Cooper**VoidedRepairs cannot overlap
Dunlop**** MaintainedRepairs cannot overlap
1 repair, H and above
Firestone**VoidedRepairs cannot overlap
Fuzion** Voided Repairs cannot overlap
General***VoidedRepairs cannot overlap
Goodyear**** MaintainedRepairs cannot overlap
1 repair, H and above
Hankook**VoidedRepairs cannot overlap
Kumho**VoidedRepairs cannot overlap
Michelin* Maintained3 repairs, minimum 90° apart*
PirelliV and AboveRepair Not Endorsed
by Pirelli
H and BelowMaintained2 repairs, minimum 180° apart*
Toyo*V and AboveReduced to HRepairs cannot overlap
H and BelowMaintainedRepairs cannot overlap
Sumitomo**Voided Repairs cannot overlap
Uniroyal*Maintained3 repairs, minimum 90° apart*
Yokohama**Voided Repairs cannot overlap
*Only 1 repair permitted for run-flat tires
**To be driven as non-speed rated (85 mph/137 kmh maximum)
***Voids materials, workmanship and tread wear-out warranties
****Only 1 repair permitted to retain H and above speed ratings.
NOTE: Tire Rack will not repair any speed-rated run-flat tires because we cannot confirm their internal structural integrity.

Most Popular Links

Air Pressure - Correct, Underinflated and Overinflated
Air Pressure vs. Dry Performance
Air Pressure vs. Wet Performance
Air Pressure, Temperature Fluctuations
Air Pressure/Load Adjustment for High Speed Driving
Air Pressure: When and How to Set
Alignment
Breaking In Your Tires
Calculating Tire Dimensions
Checking Tire Inflation Pressure
Determining the Age of a Tire
Diameter Comparison of Light Truck Tire Sizes
How Do I Compare Price vs. Value?
How to Read Speed Rating, Load Index & Service Descriptions
Load Range/Ply Rating Identification
Match Mounting to Enhance Tire & Wheel Uniformity
Load Reduction of Euro- and P-Metric Tires on Light Trucks
Measuring Tire Tread Depth with a Coin
Mounting and Balancing
P-Metric and Euro Metric Tire Sizing
Run-Flat Tires
Selecting the Right Tires
Sidewall Markings
Specific Mileage Warranties
The Plus Concept
Tire & Wheel Owner's Manual
Tire & Wheel Package Installation Instructions
Tire & Wheel Package Ride Uniformity Confirmation
Tire Pressure Monitoring Systems
Tire Rotation
Tire Size Conversion Chart
Tire Size Information
Tire Warranties
Uniform Tire Quality Grade (UTQG) Standards
Where to Install New Pairs of Tires?


JOIN US
GET OUR EMAILS

Want to stay on the inside track?
Sign up for our emails today!