Join Date: Nov 2001
Location: North Central Illinois
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Re: Wheel Measurements?
Wheels for 4x's are measured by backspacing , or rear offset . If the wheel is laying face down , it's the amount of space from the lip edge to the back side of the mounting flange . It basically gives you an idea of how far the wheel will protrude into the well , from the flange mounting surface at the axle . If the wheels are measured in offset , it's the distance from center either positive or negative . So , if the wheel's width is 8" , a 2" positive offset would move the wheel out 2" , leaving a 2" backspace . Hope this helps , I know it gets confusing . One thing to consider: too much offset to the outside will also cause a much larger arc as the steer wheels are turned . A centered rim will turn the easiest , since it's arc stays on the kingpin's own centerline . By moving the pivot point out , it makes it harder to steer , and also will require a greater space in which to turn through that arc . In other words , with a 2" backspace and 33x12.50's , you can actually hit the front bumper and the firewall in the tub when the wheel is turned to full lock . It won't hit the springs , since the arc has been moved outward away from them . Have fun ,