Wheel offsets, diameters and fenders - Page 2 - JK-Forum.com - The top destination for Jeep JK and JL Wrangler news, rumors, and discussion

01-21-2018, 03:20 PM

#11

nthinuf

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Quote:

Originally Posted by Seizer

So let me ask this. If I snag stock 17" wheels, (this is just hypothetical numbers I have not researched stock 17" offsets) and they have an offset of +50mm. I buy 1.5" spacers and install these. Does this mean subtract 38mm from the 50mm and now my offset will be +12mm?

It is easier to convert and use Backspace, as Offset uses the specific rim width in the calculation for how far out the rim moves. (a 12mm offset on a 6" wide rim is a 4.0" backspace. And a 12mm offset on a 10" wide rim is a 6.0" backspace.)

Stock rims are roughly 6.25" backspace. As that number goes down, the rim moves further out an equal amount. So stock rims + spacers is equivelent to rims with a 4.75" backspace. (6.25" - 1.50" = 4.75")

Offset is supposed to be the more accurate number to use, it just gets confusing when comparing rims with different widths.

Last edited by nthinuf; 01-21-2018 at 03:23 PM.

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