1999 Lexus RX 300 User Guide 1 - Page 274

CHASSIS ROTATING TIRES CHECKING AND REPLACING TIRES When to replace your tires 63E005-1 63R006 To equalize tire wear and help extend tire life, Lexus recommends that you rotate your tires approximately every 12000 km (7500 miles). However, the most appropriate timing for tire rotation may vary according to your driving habits and road surface conditions. The wheel assemblies must be rotated as illustrated above. When rotating tires, check for uneven wear and damage. Abnormal wear is usually caused by incorrect tire pressure, improper wheel alignment, out-of balance wheels, or severe braking. Before storing radial, snow or studded tires, mark the direction of rotation and be sure to install them in the same direction when using them again. Tires should be stored in a cool dry place. " 1 New tread 2 Tread wear indicator 3 Worn tread Replace the tires when the tread wear indicators show. The location of the tread wear indicators is shown by the marks such as "TWI" or "∆" marks molded on the sidewall of each tire. The tires on your Lexus have built-in tread wear indicators to help you know when the tires need replacement. When the tread depth wears to 1.6 mm (0.06 in.) or less, the indicators will appear. If you can see the indicators in two or more adjacent grooves, the tire should be replaced. The effectiveness of snow tires is lost if the tread wears down below 4 mm (0.16 in.). 259