What is the backspacing on a rim?

Backspacing is defined as the distance from the hub mounting surface to the inside lip of the wheel (measured in inches). More backspacing puts the tire in closer to the center of the truck. A related term is known as offset, which relates the hub mounting surface to the centerline of the rim.

What is 4.5 backspacing in offset?

For example, an 8 inch wide wheel with a 4.5 inch backspace would be the equivalent of a zero offset because the mounting surface aligns with the centerline of the wheel.

How do you calculate backspacing?

Take a straight edge and lay it diagonally across the inboard flange of the wheel. Take a tape measure and measure the distance from where the straight edge contacts the inboard flange to the hub mounting pad of the wheel. This measurement is backspace. The above photo shows three wheels with 2″,3″, & 4″ backspace.

How many inches does a Offset?

Offset is simply the distance from the hub mounting surface to the center of the wheel. In other words, Offset = Measured Backspace – Calculated Wheel Center Distance. In this example, we already know that our Measured Backspace = 5 3/16 inches. And we know that our Calculated Wheel Center Distance = 6 inches.

How big is a bolt pattern on a wheel?

Bolt pattern or bolt circle is the diameter of an imaginary circle formed by the centers of the wheel lugs. Bolt patterns may contain 4-, 5-, 6-, or 8-lug holes or studs. A bolt circle of 4×100 would indicate a 4-lug pattern on a circle with a diameter…

How many lug holes are in a wheel pattern?

Wheel Bolt Pattern is the measured diameter of an imaginary circle formed by the centers of the wheel studs or bolt holes. Common bolt patterns have 4, 5, 6, or 8 lug holes, while less common have 3, 7, or 10 lug bolt patterns. Interchangeable Wheel / Bolt Pattern Chart for Cars, Trucks, Vans, SUVs, Motorhomes, RVs, ATVs, UTVs and Trailers

What are the specs for a car wheel?

Wheel Specifications. Backspace (or Rear Spacing) The distance from the extreme back edge of the rim to the mounting surface. Offset. The distance from the centerline of the wheel to the face of the mounting surface of the wheel. Pitch Center Diameter (PCD) Bolt Pattern. X Factor.

How to measure alloy wheel bolt pattern cross reference?

Measure 8 lug wheel bolt patterns from center to center distance between two studs that are across the hub from each other. This measurement is your bolt pattern diameter. Learn more about wheel dimensions. Note: Alloy wheels should always be installed using a torque wrench ensuring proper mount.

How big is a 5 lug bolt on a wheel?

Bolt patterns can be 3, 4, 5, 6, 7, 8 or 10 lug holes. A bolt circle of 5 x 4.5 would indicate a 5 lug bolt pattern on a circle with a diameter of 4.5 inches. There are four important measurements that are used to categorize and identify a wheel for fitment purposes.

What is the backspacing on a rim?