See Figures 1 and 2
Common sense and good driving habits will afford maximum tire life. Fast starts, sudden stops and hard cornering are hard on tires and will shorten their useful life span. If you avoid full throttle starts, allow yourself sufficient time to stop, and take corners at a reasonable speed, the life of your tires will increase greatly. Also make sure that you don't overload your vehicle or run with incorrect pressure in the tires. Both of these practices increase tread wear.
Inspect your tires frequently. Be especially careful to watch for bubbles in the tread or side wall, deep cuts, or underinflation. Remove any tires with bubbles. If the cuts are so deep that they penetrate to the cords, discard the tire. Any cut in the sidewall of a radial tire renders it unsafe. Also look for uneven tread wear patterns that indicate that the front end is out of alignment or that the tires are out of balance.
Store the tires at the proper inflation pressure if they are mounted on wheels. Keep them is a cool dry place, laid on their sides. If the tires are stored in the garage or basement, do not let them stand on a concrete floor; set them on strips of wood.
So that the tires wear more uniformly, it is recommended that the tires be rotated - NEVER A USE COMPACT SPARE TIRE OTHER THAN FOR TEMPORARY USE! Proper rotation can only be done when all four tires are of the same size and load rating capacity. Any abnormal wear should be investigated and the cause corrected.
Studded snow tires may lose their studs if their direction of rotation is reversed. Mark the wheel position or direction of rotation on studded snow tires before removal.
Avoid overtightening the lug nuts otherwise the brake disc or drum may become permanently distorted. Alloy wheels can be cracked by overtightening. Always tighten the lug nuts in a criss-cross pattern.
See Figure 3
When buying new tires, you should keep the following points in mind, especially if you are switching to larger tires or a different profile series (50, 60, 70):
- All four tires should be of the same construction type. Radial, bias or bias-belted tires must NOT be mixed. Radial tires are highly recommended for their excellent handling and fuel mileage characteristics.
- The wheels must be the correct width for the tire. Tire dealers have charts of tire and wheel compatibility. A mismatch can cause sloppy handling and rapid tread wear. The tread width should match the rim width (inside bead to inside bead) within 1 in. (25mm). For radial tires the rim width should be 80 percent or less of the tire (not tread) width.
- The height (mounted diameter) of the new tires can change speedometer accuracy, engine speed per given road speed, fuel mileage, acceleration, and ground clearance.
- Most models use a space-saving spare tire mounted on a special wheel. This wheel and tire is for EMERGENCY USE ONLY. Never try to mount a regular tire on a special spare wheel.
- There shouldn't be any body interference when the car is loaded, on bumps or in turning through maximum range.
See Figures 4 and 5
The importance of proper tire inflation cannot be overemphasized. A tire employs air under pressure as part of its structure. It is designed around the supporting strength of air at a specified pressure. For this reason, improper inflation drastically reduces the tire's ability to perform as it was intended. A tire will lose some air in daily use; having to add a few pounds of air periodically is not necessarily a sign of a leaking tire.
Tire pressures should be checked regularly with a reliable pressure gauge. Too often the gauge on the end of the air hose at your corner garage or service station is not accurate enough because it suffers too much abuse. Always check tire pressure when the tires are cold, as pressure increases with temperature. If you must move the vehicle to check the tire inflation, do not drive more than 1 mile (1.6 km) before checking. A cold tire is one that has not been driven on for a long period of time.
Never exceed the maximum tire pressure embossed on the tire! This maximum pressure is rarely the correct pressure for everyday driving. Consult your owner's manual for the proper tire pressures for your vehicle.
CARE OF SPECIAL WHEELS
If you have invested money in magnesium, aluminum alloy or sport wheels, special precautions should be taken to make sure your investment is not wasted and that your special wheels look good for the lifetime of the car.
Special wheels are easily scratched and/or damaged. Occasionally check the rims for cracking, impact damage or air leaks. If any of these are found, replace the wheel. In order to prevent this type of damage, and the costly replacement of a special wheel, observe the following precautions: