The numbers 4. Finally, the numbers 4. If your tire is marked 4. PROFILE on a car tire) 8 – is the Diameter of the rim.Imagine the rim as a well. The rim diameter is the width of that well, measured from bead seat to bead seat—the spots where your tires grip the rim. This measurement is critical and must correspond exactly to the diameter of the tire being mounted. For example, a 16-inch tire must be paired with a 16-inch rim.The “4. In this case, the tire is 4. The next digit represents the wheel size the tire will fit. This tire is meant for trailer wheels that are 8 inches in diameter.The difference between the two size of 4. This translates into one less inch of fender clearance since the diameter of a tire is split on either side of the spindle.
How do I find my rim size?
You can find that on the sidewall of the tires on your original wheels or the inside frame of the driver’s door. Check out Tire Size Explained (Reading the Sidewall) for more. The wheel diameter (in inches or millimeters) is the fifth set of numbers and letters. If the tire isn’t mounted, the simplest way to measure the rim’s width is from bead seat to bead seat, rather than measuring the full outer lip-to-lip distance. You’ll need a measuring tape or calipers to measure from the inside edge where the tire bead sits across to the opposite side.