Tire Mixing

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TIRE MIXING

We recommended that all tires on a vehicle comply with the vehicle manufacturer's recommendations as defined on the vehicle's tire placard or certification label. Deviations from that recommendation must be done with care. Unless the vehicle was originally equipped with different sizes on the front and rear axles, all tires on the vehicle should be of the same size, tread design, speed rating, load capacity, and construction - radial or non-radial. If tire mixing cannot be avoided, the following guidelines are provided to help you.

Tire Replacement

Replacing a single tire on a vehicle can have an adverse affect on suspension systems, gear ratios, transmission and tire treadwear. If single tire replacement is unavoidable, follow these guidelines:

If a fairly new full-size spare is available, pair it with the new tire and place both on the rear axle.

If no full-size spare is available or is fairly worn, it is recommended that the two new tires be mounted on the rear axle.

If it is impossible to obtain two new replacement tires, it is recommended that the single new tire be paired with the deepest tread tires from the vehicle and both be placed on the rear axle.

CAUTION:
Significant differences in tread depth may contribute to handling and/or mechanical problems. Consult vehicle manufacturer.

Except when replacing with only two lower speed rated tires (see below), two new replacement tires should be installed on the rear axle.

Sizes
If it is necessary to mix tire sizes on a vehicle, the size of the tires on the same axle MUST be the same. Vehicles eqiupped with ABS, traction control, four wheel drive, and all wheel drive systems MUST have equivalent tire size on all wheel positions. The only exception is when a temporary spare is in use.

Radial and Non-Radial
If two radial and two non-radial tires are to be installed on a vehicle, the two radials MUST be installed on the rear axle and the two non-radials on the front axle. If the vehicle has dual rear wheels, two radials could be used on the front and four non-radials on the rear. Another acceptable option may be to install two non-radials on the front axle and four radials on the rear axle.

ALL FOUR TIRES SAME SIZE, SAME TYPE ON SAME VEHICLE
(Radial or Non-Radial) Front, Rear or 4-Wheel Drive

RADIALS AND NON-RADIALS ON SAME VEHICLE
(Front or Rear Wheel Drive)

Same size and type on an axle.
Radials on rear axle, non-radials on front axle

Speed Ratings
If tires of different speed ratings are mounted on a vehicle, it is recommended that the lower speed-rated tires be placed on the front axle regardless of which axle is driven. This is to prevent a potential oversteer condition. Vehicle handling may be adversely affected and the vehicle's speed capability is now limited to the lowest speed-rated tire.

Vehicles Equipped with ABS, Traction Control, All Wheel Drive Systems
All four wheel positions must be equipped with the same tire size to insure ABS, traction control, and all wheel drive systems function properly.

Four-Wheel Drive
If no instructions for tire mixing appear in the vehicle owner's manual, adhere to the following guidelines:

Do not mix sizes. All four tires must be branded with the same tire size.
Do not mix radial and non-radial tires. All four tires must be either radial or non-radial.
Be sure that the outside circumference of all four tires is within one and one-half (1-1/2) inches of each other.
Do not mix tread pattern types such as all-terrain and all-season.


Mud/Snow Tires
It is recommended that mud and snow tires be applied on all four positions (especially for front-wheel-drive or performance vehicles), but may be applied in pairs (or as duals) to the drive axle or rear wheel drive vehicles. Never put non-radial snow tires on the rear if radial tires are on the front, except when the vehicle has duals on the rear.

Studded Snow Tires
Studs should only be installed in new tires molded for studs. Never insert studs in a used tire (even if only slightly used). Consult tire manufacturer for proper stud size.

If studded tires are installed on only the rear of any vehicle, it is recommended that they also be installed on the front to maintain optimum handling characteristics of the vehicle.

If studded snow tires are installed on the front of any vehicle, they MUST also be installed on the rear. Without studded snow tires on the rear, vehicle handling can be adversely affected. This may result in loss of vehicle control, which could cause serious injury or death.

Note: Most states maintain regulations for the application of studded tires. Before mounting studded tires to your vehicle, be sure to check the regulations in your area.

WARNING: Improper chain type or size may damage the sidewall of a tire, causing failure.

 

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