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Old 08-06-2011, 09:59 PM
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shane2010's Avatar
Join Date: Jul 2011
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Offset? backspacing? both? HELP!

So many wheels out there. I get the backspacing idea but what is offset? ex. 12mm offset. And to confuse me further some wheels advertise BOTH offset and backspace. ex. kd monster. Maybe someone could tell me whats ideal in both catagories. I know I know, Im not asking much lol. All I want is an 18" black wheel that will hold 35s and fit just right.

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Old 08-06-2011, 10:48 PM   #2
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Offset and backspacing are same thing, it just uses different methods to get there. Offset is in metric and measure the offset from center of the wheel. Positive offset moves the center towards the face of the wheel while negitive offset moves the center towards the inside of the wheel.

Backspacing uses stardard SAE and is the distance from the center of the wheel to the back edge of the wheel.

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Old 08-07-2011, 06:34 AM   #3
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With the exception that if you keep the same offset in the next wider rim, the backspace will increase causing things to foul.

This means to go for a wider rim that has the same backspace so as to keep the stock clearances the offset will increase positively.

They say a picture paints a thousand words, so heres a drawing I modified to show the stock 17in rims we get down here:

Cheers from Downunder, Dave.
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2.5in Flexy springs, Bilstien 5100's, Teraflex rear trackbar bracket, Synergy front and rear sway bar links and front disco kit, Synergy steering damper relocation bracket, AEV front drop brackets, ARB front and rear bar, 10,000lb rope winch, Britax Xray Vision driving lights, GME 3440 UHF radio.
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Old 08-07-2011, 09:26 AM   #4
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Just two different ways of measuring the same thing. To me, BS is much easier to understand and visualize.
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Old 08-07-2011, 09:31 AM   #5
Join Date: Aug 2011
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Very nice diagram...So basically if you want your tires/rims to stick out from your ride a little more, you want a negative offset.
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