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Wheel BreakdownNot clear on what the parts of a wheel are? Check out the diagram to break it down.
Wheel SizeWheel size is made up of the wheel diameter and wheel width.
Wheel Diameter: To get the wheel diameter, measure across the face of the wheel from bead seat to bead seat.
Wheel Width: To get the wheel width measure across the barrel of wheel from bead seat to bead seat.
Bolt PatternWheels contain holes in the center. The largest (in the direct center) is the bore. The smaller holes (surrounding the bore) are the lug holes. These are the mechanical attachment point for the wheel to the vehicle. The lug holes are organized in a circular pattern called the bolt pattern. Bolt patterns come in 4-lug, 5-lug, 6-lug, 8-lug and dual. The first number refers to the number of lug holes are on the wheel. The second number describes the diameter of the circle the holes make. As an example, a wheel with a 6x127 bolt pattern has 6 lug holes that are equally spaced on a 127mm circle.
For a 4-lug wheel, the pattern is measured in a straight line from center to center of two bolts that are directly across from each other.
For a 5-lug wheel, the pattern is measured by using a straight line from the backside of one hole to the center of the third hole.
6-lug patterns are measured in a straight line from center to center of two bolts that are directly across from each other.
8-lug patterns are measured in a straight line from center to center of two bolts that are directly across from each other.
Along with the 4-lug, 5-lug, 6-lug and 8-lug bolt patterns, there is the dual bolt pattern. If a wheel has a dual bolt pattern it will have two different sets of lug holes. This enables the wheel to accept two different bolt patterns, allowing it to fit more models of vehicles.
OffsetOffset is in reference to the wheel's idea placement, creating a freely rotating wheel without rubbing brakes and fenders. To get the wheel's offset, measure the distance (in millimeters) between the centerline and the mounting surface. The wheel's offset is either positive, zero or negative.
The mounting surface of the wheel extends past the wheel's centerline. The mounting surface ends up closer to the face of the wheel.
The mounting surface of the wheel is centered within the rim, aligned with the wheel's centerline.
The mounting surface of the wheel sits before the wheel's centerline. The mounting surface ends up closer to the back of the wheel and closer to the vehicle's suspension.