Warranty

Consumers should also be wary of used tires that:
- May have been used on vehicles involved in an accident
- May have been used in severe service conditions (e.g. used for off-road, sporting, military or
law enforcement purposes)
- May have been exposed to unusual environmental conditions such as severe storms, floods,
fires, etc.
PLUS SIZING
Visit www.rma.org and select “Publications”, and select “Tire Service Professionals” and select “Manual”
and select “Auto/Light Truck” and select “Replacement Guidelines for Passenger and Light Truck Tires
Manual & Supplement”.
Plus sizing for light vehicles in the after-market is primarily based on the following tire/wheel
characteristics:
- Maintain overall tire diameter of the OE tires;
- Increase the tire section width (contact patch/footprint becomes shorter and wider);
- Decrease the series profile (a.k.a. aspect ratio or section height);
- Increase the rim/wheel diameter.
Plus sizing is generally conveyed in terms of “Plus 1”, “Plus 2”, “Plus 3”, etc. If tire fitments
other than the OE is desired, always follow the vehicle manufacturers’ recommendations and
consider the following:
• Aspect Ratio: Additional consideration should be made for substitute tires that are lower in aspect
ratio than the OE fitments. Lower aspect ratio tires typically aid performance and handling, but
they provide a less comfortable ride. High performance, low aspect ratio tires may also wear more
quickly and produce more noise during operation. Low aspect ratio tires -- and their rim/wheel
assembly -- are more susceptible to damage from road hazards and pothole/curb impact.
• Overall Diameter: Check to be sure that the overall diameter of all four tires is within the
accepted tolerance of the vehicle manufacturer.
• Inflation Pressure: Check to see if it needs to be adjusted. Fitment of a new tire (other than
the OE size) on the vehicle may require a higher inflation pressure than specified on the vehicle
tire placard to adequately carry the load. If so, the installer should inform the owner of the new
required inflation pressure. The installer should also place a sticker or decal next to the vehicle
tire placard showing the new tire size and inflation pressure requirements for future reference.
You should never inflate a tire below the recommended pressure shown on the vehicle’s tire
placard, or above the maximum inflation pressure as listed on the sidewall of the tire.
• Load Carrying Capacity: Must be equal to or higher than the OE fitment.
• Speed Symbol/Category: Must be equal to or higher than the OE fitment if the speed capability
is to be maintained.
• Rim Width/Off-Set: Check OE/rim manufacturer’s recommendations.
• Rim/Wheel Selection: Never exceed the maximum pressure and/or load capacity of the rim/
wheel.
• Vehicle Clearances: Steering tires must be checked in full left and right turns. All wheel
positions should be checked for proper clearance in fender walls, brake components, shock
towers, and other suspension components. These wheel positions must be checked for full
suspension jounce and rebound.
• Vehicle Modifications: Lift kits and other types of suspension alterations or use of tires not
approved by the vehicle or tire manufacturer can adversely affect vehicle handling and stability.
• State/Local Laws: Check to be sure that the fitment complies with any state/local regulations.
STORAGE
Tires should be stored in a cool dry place indoors so there is no danger of water collecting inside
them. Serious problems occur with tube-type tires when they are mounted with water trapped
between the tire and the tube. Due to pressurization, the liquid can pass through the inner liner
and into the casing plies. This can result in sudden tire failure. Most of the problems of this
nature, encountered with tube type tires, have been due to improper storage which permitted
water to enter the casing between the tire and tube prior to mounting.
When tires are stored they should be stored in a cool dry place away from sources of heat and
ozone, such as hot pipes and electric motors. Be sure that surfaces on which tires are stored are
clean and free from grease, gasoline or other substances which could deteriorate the rubber. Tires
exposed to these materials and/or excessive heat for a prolonged period of time during storage
may be weakened and subject to sudden failure.
15
Safety Warnings
For more information on safety, visit www.US.CooperTire.com and select “Tire Safety.”