The following is just a bit of info we thought might be useful to our customers.

Wheel Offset
The offset of a wheel is the distance from the hub mounting surface to the centerline of the wheel. It is very important to purchase a wheel with the correct offset for your year vehicle. If the offset is not right for your car, the steering and handling will be affected.

There are three types of offset:

Wheel Backspacing:
Backspacing is distance from the back edge of a wheel rim to the back of the center section. Measured in inches, backspacing is closely related to offset. This measurement is important because it determines the clearance of the wheel in the well, and the amount the wheel will stick out. You can measure a wheel’s backspacing by running a straight edge across the rim bead and dropping another straight edge down to the wheel face, measuring that distance.

Wheel Bolt Pattern:
The bolt pattern is the diameter of the circle made by the centers of the wheel lugs. So, for our 4-lug wheels, a bolt pattern of 4 x 4.5 inches means that the lug pattern falls on a circle that is 4.5 inches in diameter. Note: 4x4.5 inches is 4x114.3 mm

The chart below list the proper tire sizes for the various wheel sizes, depending on the year and model. While we included Falcons, unfortunately we don't have the information.
If anyone happens to know, we would appreciate getting an e-mail with the info so we
can finish filling in the chart. Thank you.

The series of letters and numbers on a tire's sidewall tell a lot about what you're getting for your money, as well as the tire's capabilities. The first series of letters and numbers denote the tire size and construction. The next two numbers, followed by a letter, are the "Service Description". Lets look at a common tire size P215/65R15 94T.

P	Passenger Car (LT = light truck, T = temporary or spare)
215	Section Width measured in millimeters (25.4 millimeters per inch)
65	Aspect Ratio (sidewall height is 65 percent of the section width)
R	Radial Construction (D = diagonal bias, B = bias belted)
15	Rim or Wheel Diameter
94	Load Index (see chart below)
T	Speed Rating (see chart below)

Uniform Tire Quality Grading Passenger car tires also have a grade on them as part of the uniform tire quality grading (UTQG) system. You can check the UTQG rating for your tires on this page maintained by the U.S. National Highway Traffic Safety Administration (NHTSA). Your tire's UTQG rating tells you three things: Tread Wear: This number comes from testing the tire in controlled conditions on a government test track. The higher the number, the longer you can expect the tread to last. Traction: Tire traction is rated AA, A, B or C, with AA at the top of the scale. This rating is based on the tire's ability to stop a car on wet concrete and asphalt. It does not indicate the tire's cornering ability. Temperature: The tire temperature ratings are A, B or C. The rating is a measure of how well the tire dissipates heat and how well it handles the buildup of heat. The temperature grade applies to a properly inflated tire that is not overloaded.