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post #1 of (permalink) Old 08-21-2002, 06:59 PM Thread Starter
 
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Wheel Measurements?

Now I know that when a wheel width is quoted its the distance across the rim from the inside of the inboard and outboard lips. (thats a mouthful)

So when Backspacing measurements are quoted is it from the mounting flange to the inside or outside of the inboard lip?

I'm about to take my stock wagon wheels to a engineering shop to have the centres cut aout then rewelded back on with a smaller backspacing value.
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post #2 of (permalink) Old 08-21-2002, 07:16 PM
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Re: Wheel Measurements?

Nige,
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 ,
Sarge
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post #3 of (permalink) Old 08-21-2002, 07:30 PM Thread Starter
 
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Re: Wheel Measurements?

Yeah understand that. Thanks.

I've attached a pic (I hope) to help with my question.

Is the measurement the blue distance or the red distance. If you imagine this is a cross section of the rim.
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File Type: gif 867561-BACKspace.gif (2.2 KB, 1 views)
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post #4 of (permalink) Old 08-21-2002, 07:36 PM
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Re: Wheel Measurements?

Red
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