Lexus SC 430 2006 Owner's Manual page 228

Tire selection
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When replacing a tire, use a tire of the same size and construction, and the same or
greater maximum load as the originally installed tires.
Check that the maximum load of the replaced 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.
As for the maximum load of the tire, see the load limit at maximum cold tire inflation
pressure mentioned on the sidewall of the tire.
As for the Gross Axle Weight Ratings (GAWR), see the Certification Label.
(P.301)
Types of tires
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1. Summer tires:
Summer tires are high-speed capability 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, we recommend using snow tires.
If installing snow tires, be sure to replace all four tires.
2.All season tires:
All season tires are designed to provide better traction in snow and to be ade-
quate for driving in most winter conditions, as well as for use year round. All sea-
son 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.
3.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 capac-
ity 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. Installing snow tires on the rear
wheels only can lead to an excessive difference in road grip capability between
the front and rear tires which could cause loss of vehicle control. (P.115)
4-3. Do-it-yourself maintenance
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