WHEELS AND TIRES ARE MARKED WITH THEIR SIZES. THE WHEEL AND TIRE MUST MATCH BEFORE MOUNTING.
1. Mount all tires according to the FMVSS120 wheel fitment and The Tire and Rim Association book. There are several brands and types of tire mounting equipment available for mounting tires on aftermarket wheels, including rim clamp (euro style) and centerpost machines. To avoid scratching or damaging a wheel during mounting/dismounting of tires, make sure the tire machine is properly adjusted and all necessary protective covers are used where metal-to-metal contact is made. Protective eyewear must be used at all times during the mounting/dismounting, installation and servicing of wheels, and related components.
2. The tire manufacturer’s requirements and recommendations must be followed.
3. The tire may be labeled with a color dot (painted mark or label, likely in red) that indicates the high spot of the tires maximum runout or the expected force variation location. This should be aligned with the wheel’s low-runout spot, which may be identified with a small notch or color dot. Since labeling approaches vary, check with the wheel manufacturer’s instructions for low-spot identification.
4. Use approved tire mounting lubricant on both tire beads and apply to the bead seat area of the wheel if required.
5. Be careful that the bottom bead breaker on centerpost changing equipment does not hit the bottom of the wheel as it travels upwards.
6. Place tire and wheel into mounting safety cage and do not exceed 40 pounds of pressure when seating the tire to the bead of the rim. If the tire bead does not seat on the wheel with 40 pounds of pressure, DEFLATE, TURN 180 degrees, RELUBRICATE and check for tire/wheel size mismatch before re-inflation. Do not inflate the mounted tire with the center-post hold-down cone or rim clamps tightened on wheel. Loosen the hold-down cone, but do not completely remove, and release the rim clamps to let the tire expand.
7. Once beads are seated, install the valve core, reconnect the air chuck, set the air regulator and continue to inflate the tire until the manufacturers recommended pressure is reached. Check the bead edges and the valve for leaks, and then install the valve cap.
NEVER STAND OVER THE TIRE/WHEEL ASSEMBLY (TRAJECTORY ZONE) DURING INFLATION. ALWAYS STAND TO THE SIDE. DO NOT LEAVE UNATTENDED.
Wheel manufacturer warranties do not cover tire-tofender clearance or tire-to-suspension clearances. These clearances must be fit-checked before mounting all the tires. On some “plus” applications rubbing and scuffing may occur. The following procedures must be followed:
1. Mount one tire on a wheel intended for use on the front of vehicle.
2. Install the tire/wheel assembly on the front hub and with the vehicle still on the lift, turn the steering from extreme right to extreme left while checking for any interference with fender well or suspension components.
3. Lower the vehicle and repeat Step 2 with the weight of the vehicle applied.
4. Have someone “bounce” the front of the vehicle and check for tire rub. DO NOT PUT HANDS, FINGERS OR ANY BODY PART BETWEEN THE TIRE AND VEHICLE WHILE CHECKING.
5. Mount one tire on a wheel intended for use on the rear of the vehicle.
6. Install the tire/wheel assembly on the rear hub and check for interference, especially when on the ground and being bounced. Check that wheel balance weights do not contact suspension components and that tires do not contact fenders.
1. Balance tire/wheel assembly according to the balancing machine manufacturer’s recommended procedures, following ALL safety precautions.
2. To reduce tire wear, road noise and vibration, all four wheels should be balanced.
3. If you have problems in balancing, review the steps under Wheel Fit Check. Some balancing problems may be remedied by deflating the tire and rotating it approximately 180° on the rim, re-inflating the tire and rebalancing.
HUB CENTERING RINGS
Prior to installing hub centering rings be sure to check the following:
1. Verify that the inside diameter of the ring is correct by first placing the ring on the vehicle hub and pushing it on the hub until it touches the base of the hub at the point it meets the mounting surface of the vehicle. A good fit is one where the ring is snug against the diameter of the hub and flush against the mounting surface of the vehicle.
2. Verify that the centering ring fits correctly onto the wheel. A good fit is when the ring can be easily pushed by hand onto the back of the wheel and the ring is snug against the walls of the center hole of the wheel. When fully pushed in, the surface of the hub ring must be flush with or just slightly below the mounting surface of the wheel. The hub ring must not protrude beyond the mounting surface of the wheel.
3. To install the centering ring, place the ring into the center hole on the backside of the wheel and mount to the vehicle.
1. Clean and inspect all stud threads and mounting surfaces before installation. Threads must not be lubricated, and must be free of corrosion, rust, burrs, fractures and damage. Replace if any corrosion, stripping, damage, or fractures are found. Always use new fasteners (lug nuts or lug bolts) when installing new wheels.
2. Be certain the fasteners are correct for the application. They must match the thread diameter, pitch and seat; otherwise the installation will be improper, and may result in damage or a dangerous condition. “Thread diameter” refers to the diameter of the stud measured at the outer edges of the threads. “Thread pitch” for non-metric applications refers to the number of threads per inch; for metric applications, it is the distance between the threads in millimeters. The “seat” means the area on the wheel where the fastener will clamp down.
The basic types of seats are: conical (60° taper “acorn” and “bulge”), mag, and spherical or ball. Shown below is a drawing of each type in its proper application.