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Old 01-11-2014, 12:02 PM   #1
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Wheel Offset Questions

Hey guys so I think I need to understand the offset measurement a little bit better.

I've been looking to get a set of 5 pro comp 7069's for awhile now and finally have the money saved. Every retailer was ready to slap them on but one had said hold on wait a minute; bad idea for your jeep; the offset isn't right.

The wheel is 15x8 5x4.5 for bolt pattern 3.75 for backspacing and -19mm for offset.

My jeep is a 2000 tj with zero lift and 30x9.5 tires.

Is this no dice for that wheel?

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Old 01-11-2014, 12:03 PM   #2
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He said I specifically need in between -9 and 25 for my offset; which I have never been told before

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Old 01-11-2014, 12:26 PM   #3
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What the 3.75 offset does is stick the tire out further. Puts more strain on the wheel unit bearing. But it allows you to run a wider tire. What size tires are you going to be putting on? That will determine what to do.
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Old 01-11-2014, 12:51 PM   #4
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I have 30x9.5 I'll be keeping. The backpacking is 3.75 which is fine but the offset of -19mm is what they said is not going to work
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Old 01-11-2014, 01:24 PM   #5
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Those two go hand in hand with offset and rim width. To change the offset, you have to change the backspacing or rim width. Wheel Backspacing And Offset - Four Wheeler Magazine
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Old 01-11-2014, 01:37 PM   #6
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Those two go hand in hand with offset and rim width. To change the offset, you have to change the backspacing or rim width. Wheel Backspacing And Offset - Four Wheeler Magazine
X2...Don't worry about offset, all you need to do is make sure you get a wheel with around 3.75"-4" of back space. If you get the correct backspace, you are good to go. Offset is simply a measurement from the centerline of the wheel to the wheel mounting surface. Back space is a measurement from back of wheel to wheel mounting surface, so when one changes, the other changes.
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Old 01-11-2014, 01:37 PM   #7
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Those two go hand in hand with offset and rim width. To change the offset, you have to change the backspacing or rim width. Wheel Backspacing And Offset - Four Wheeler Magazine
Gotcha. That clears things up a lot. I guess a more appropriate question is what is the optimal bs for a 30x9.5 tire? I know I want 15x8 due to the wheel size vs tire and the width for my skinny tires
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Old 01-11-2014, 01:44 PM   #8
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5" to 5.5" of backspacing with 9.5" wide tires is optimal. Stock Ravine, Canyon, Ecco, and grizzly wheels all came with 5.5" of backspacing.
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Old 01-11-2014, 01:45 PM   #9
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I think the stock size rims are around 5.5-6.5 backspace depending on the rim and jeep model... so use that as a guide.. 3.75 to 4 works well with 12.50 wide tires. so maybe split the difference.
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Old 01-11-2014, 01:55 PM   #10
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Gotcha. That clears things up a lot. I guess a more appropriate question is what is the optimal bs for a 30x9.5 tire? I know I want 15x8 due to the wheel size vs tire and the width for my skinny tires
Just remember, if you ever want to go to a 31x10.5 you will probably need the backspacing of 3.75 Otherwise what others have posted will work for your 30x9.5
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Old 01-11-2014, 02:21 PM   #11
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Will 3.75 be ok with my wheels? The place says they won't do them because of the offset
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Old 01-11-2014, 02:29 PM   #12
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They will probably push the tires out so that all of the tread is inside the flare, but the sidewall sticks out a little. As long as you are OK with that, it won't be a problem.
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Old 01-11-2014, 04:24 PM   #13
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Will 3.75 be ok with my wheels? The place says they won't do them because of the offset
Find another place. They don't know what they're talking about. All 8" wide wheels with 3.75" back space have approximately -9mm offset. Probably half the people on the Forum are running wheels with that back space.

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