What is wheel backspacing?

Backspace is the distance from a wheel’s mounting surface to the back edge of the wheel in inches. By “back” we mean the brake side of the wheel. Offset measures the distance from the mounting surface of the wheel to the centerline of the wheel, and it is often indicated in millimeters.

What offset is 4.5 backspacing?

Backspacing to Offset Conversion Chart

Back- spacing 3.25 in. 4.5 in.
Wheel Width Offset (mm)
5.5 in. 0 32
6.0 in. -6.4 25
6.5 in. -12 19

Does backspacing matter on wheels?

More backspacing means more of the wheel is in the wheel well. More wheel in the wheel well increases the risk of the wheel rubbing against brakes or the suspension or even aftermarket mud flaps. That’s not a good thing. Backspacing is even more important when you lift your truck.

How do you check wheel 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.

What’s more important backspacing or offset?

Correct backspacing allows enough room for the suspension, brake, and steering systems to operate without interference from the wheel. Positive offset creates more backspace, while negative offset reduces backspace.

How much offset is 3.5 backspacing?


BACKSPACE 3.25″ 3.5″
7.5″ -25 -19
8″ -32 -25
8.5″ -38 -32
9″ -44 -38

Does higher offset stick out more?

Typically expressed in millimeters, offset refers to the distance between the wheel’s mounting hub and the center line of the wheel. When bolted up to your car this means that a lower offset wheel will stick out farther.

Does offset change with wheel size?

There are 2 things you need to consider here. If you’re using the same width as stock, all you need to pay attention to is the offset of the new wheel. If you are changing the width of the wheel, the offset equation changes completely and you need to reevaluate the offset. So here you go.

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