Help with back spacing - JKowners.com : Jeep Wrangler JK Forum
 
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post #1 of 7 Old 03-02-2014, 09:24 AM Thread Starter
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Help with back spacing



These wheels are 18x9 with a offset of 10mm. I'm looking at putting on Mickey Thompson MTZ 305/70R18's. I have a 3" mopar lift going on. I am now afraid of my offset not being enough to eliminate rubbing. I really do not want spacers.

Help!
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post #2 of 7 Old 03-02-2014, 09:42 AM
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Center of wheel would be 4.5" + 10mm (.398")= 4.89" bs.
Not a good fit for a 35x12.5" tire. Expect some rubbing depending on lifts height and bumpstops.

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post #3 of 7 Old 03-02-2014, 09:56 AM Thread Starter
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That is what I thought. Ugh...finding wheels I love is really hard!
So what I really want is a 0 offset or slight negative offset?
Thanks

Last edited by Dragmod; 03-02-2014 at 10:07 AM.
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post #4 of 7 Old 03-02-2014, 01:11 PM
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Quote:
Originally Posted by Dragmod View Post
That is what I thought. Ugh...finding wheels I love is really hard!
So what I really want is a 0 offset or slight negative offset?
Thanks
Around negative twelve mm offset on a 9" wide wheel would be a good fit for up to 35" tires. That would give right around 4" backspace. There are exactly 25.4mm in one inch so you take the wheel width which is 9" and then assume 0 offset to find the wheels center which is 4.5" backspace 4.5" front space then add the offset which is -12mm, or just a hair under 0.5", to the backspace so you have 4.5"-0.5"=4.0"
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post #5 of 7 Old 03-02-2014, 01:18 PM Thread Starter
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Thanks for the help. Apparently some sites list the back spacing at 5.39 inches. I don't get how that is but. So 1.25" 1.5" spacers are an option. Is this just a no no or are spacers fine and I shouldn't worry.
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post #6 of 7 Old 03-02-2014, 01:48 PM
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Zero offset on a 9 inch wheel is 5 inch backspacing. Wheels are about an inch wider than their stated size. I think they measure from where the beads sit but the actual wheel sticks out farther.

Last edited by steel pirate; 03-02-2014 at 01:51 PM.
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post #7 of 7 Old 03-03-2014, 12:34 PM
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0mm wheel offset with a 35X12.5 tire is the minimum, +10mm brings the tire walls a bit too far inboard


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