Toyota Grand Highlander (AS10) 2024 Owners Manual / Maintenance and care / Tires / Checking tires

Toyota Grand Highlander (AS10): Checking tires

Check if the treadwear indicators are showing on the tires.

Also check the tires for uneven wear, such as excessive wear on one side of the tread.

Check the spare tire condition and pressure if not rotated.

1. New tread
2. Worn tread
3. Treadwear indicator

The location of treadwear indicators is shown by a "TWI" or "" mark, etc., molded into the sidewall of each tire.

Replace the tires if the treadwear indicators are showing on a tire.

■When to replace your vehicle's tires

Tires should be replaced if:

• The treadwear indicators are showing on a tire.
• You have tire damage such as cuts, splits, cracks deep enough to expose the fabric, and bulges indicating internal damage.
• A tire goes flat repeatedly or cannot be properly repaired due to the size or location of a cut or other damage.

If you are not sure, consult with your Toyota dealer.

■Tire life

Any tire over 6 years old must be checked by a qualified technician even if it has seldom or never been used or damage is not obvious.

■Maximum load of tire

Check that the number given by dividing the maximum load by 1.10 of the replacement tire is greater than 1/2 of the Gross Axle Weight Ratings (GAWR) of either the front axle or the rear axle, whichever is greater.

For the GAWR, see the Certification Label.

For the maximum load of the tire, see the load limit at maximum cold tire inflation pressure mentioned on the sidewall of the tire.

■Tire types

• Summer tires

Summer tires are high-speed performance tires best suited to highway driving under dry conditions. Since summer tires do not have the same traction performance as snow tires, summer tires are inadequate for driving on snow-covered or icy roads. For driving on snow-covered roads or icy roads, the use of snow tires is recommended. When installing snow tires, be sure to replace all four tires.

• All season tires

All season tires are designed to provide better traction in snow and to be adequate for driving in most winter conditions as well as for use year-round. All season tires, however, do not have adequate traction performance compared with snow tires in heavy or loose snow. Also, all season tires fall short in acceleration and handling performance compared with summer tires in highway driving.

• Snow tires

For driving on snow-covered roads or icy roads, we recommend using snow tires. If you need snow tires, select tires of the same size, construction and load capacity as the originally installed tires. Since your vehicle has radial tires as original equipment, make sure your snow tires also have radial construction.

Do not install studded tires without first checking local regulations for possible restrictions. Snow tires should be installed on all wheels.

■If the tread on snow tires wears down below 0.16 in. (4 mm)

The effectiveness of the tires as snow tires is lost.

■Checking the tire valves

When replacing the tires, check the tire valves for deformation, cracks, and other damage.

WARNING

■When inspecting or replacing tires

Observe the following precautions to prevent accidents.

Failure to do so may cause damage to parts of the drive train as well as dangerous handling characteristics, which may lead to an accident resulting in death or serious injury.

• Do not mix tires of different makes, models or tread patterns.

  Also, do not mix tires of remarkably different treadwear.

• Do not use tire sizes other than those recommended by Toyota.
• Do not mix differently constructed tires (radial, bias-belted or bias-ply tires).
• Do not mix summer, all season and snow tires.
• Do not use tires that have been used on another vehicle.

  Do not use tires if you do not know how they were used previously.

• Do not tow if your vehicle has a spare tire installed.

NOTICE

■Driving on rough roads

Take particular care when driving on roads with loose surfaces or potholes.

These conditions may cause losses in tire inflation pressure, reducing the cushioning ability of the tires. In addition, driving on rough roads may cause damage to the tires themselves, as well as the vehicle's wheels and body.

If tire inflation pressure of each tire becomes low while driving

Do not continue driving, or your tires and/or wheels may be ruined.