Everything You Ever Wanted To Know About Rims

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Center Caps

The two basic types of center caps are either inserted from the back or attached from the front. For the type inserted from the back, always make sure the flange of the cap matches the wheel’s chamfer and is below the mounting surface of the wheel. If the flange of the cap protrudes beyond the mounting surface of the wheel, it will not let the wheel seat properly. If this happens, it will give you a false torque reading and the lug nuts may become loose, resulting in damage or injury.


Wheels and tires are clearly marked with their sizes. Take extra caution to make sure the wheel and tire match before mounting.

1. Mount tire according to the tire machine’s recommended procedures, including but not limited to eye protection.

2. The tire manufacturer’s rim width recommendations must be followed in wheel size selection. Reference: The Tire and Rim Association Year Book.

3. Be sure the tire changing equipment does not grip or scrape the wheel’s plated, painted or aluminum surfaces. Protect these surfaces by padding or other appropriate means.

4. The hold-down cone normally used to hold an original equipment steel wheel in place on a tire-mounting machine should not be used on an aluminum wheel, unless the proper adapter is used. The Center hole on aluminum wheels will be damaged by this hold-down cone unless the proper adapter is used.

5. Use approved tire-mounting lubricant. Lubricant should be liberally applied to both the tire bead and bead seat area of the wheel on both sides.

6. Be careful that the bottom bead breaker on changing equipment does not hit the bottom of the wheels as it travels upwards. Aluminum wheels have thicker rim sections than steel wheels and the bottom bead breaker could hit the aluminum wheel, causing fracture or damage. If the bead breaker will hit the wheel, do not mount the tire until you have obtained the proper shims or other equipment from the tire changer manufacturer to overcome this potential problem.

7. Do not exceed 40 pounds of pressure when seating the tire to the head of the rim. If tire bead does not seat on wheel with 40 pounds of pressure, DEFLATE, TURN 180 degrees, RELUBRICATE and check for tire/wheel size mismatch. In addition, never exceed the tire manufacturer’s maximum air pressure in tire.

8. Do not inflate the mounted tire with the center hold-down cone tightened on wheel. Loosen to let the tire expand but not completely remove. Never stand over tire/wheel assembly (the trajectory zone) during inflation. Always stand to the side.

Categories: Mustang Tech

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