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Old 03-21-2013, 05:43 AM
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what offset wheels for 20x12

I have an 04 with leaf springs and it came with 20x12 M19's not sure the offset how would I measure that? I had 37x12.50 and it was fine now i have 38x13.50 and they rub when turning at lock. What offsets are people with leaf springs running on 20x12 with no rubbing?
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Old 03-21-2013, 03:02 PM
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Originally Posted by PowerstrokeAaron View Post
I have an 04 with leaf springs and it came with 20x12 M19's not sure the offset how would I measure that? I had 37x12.50 and it was fine now i have 38x13.50 and they rub when turning at lock. What offsets are people with leaf springs running on 20x12 with no rubbing?
Should be stamped on the rim. If you pull a wheel off, look for it. To go 1" wider tire with no rubbing, you will need to go to a rim at least 12mm smaller of an offset.

So if you have a -44. Go to a -56 with the same width wheel.
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Old 03-21-2013, 06:03 PM
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is it measured from the front lip of the wheel to center of the hub where it mounts? Kind of like the opposite of back spacing and in metric?
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Old 03-21-2013, 06:28 PM
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Originally Posted by PowerstrokeAaron View Post
is it measured from the front lip of the wheel to center of the hub where it mounts? Kind of like the opposite of back spacing and in metric?
Offset is mounting face to centerline of the wheel. Backspace is mounting face to backside of the wheel.

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Old 03-22-2013, 05:26 AM
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i looked but cant see any marking, my wheels are pretty beat up. If it has 4.5" backspacing and its a 20x12 so the centerline would be 6". So would it have a -1.5" offset or -38 converted? and I should be good no rubbing with a 6mm smaller offset since the tire is 1 inch wider it would be 1/2 an inch on each side?
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Old 03-22-2013, 12:08 PM
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When all else fails, I cheat and go to this site.

Custom rims, wheel tire packages for your ride - RIMSnTIRES.com

The fact is, back spacing is for old guys like me. If you don't want to look like a tool when you go buy wheels, then you need to learn how off set works. As Master Yoda taught us: "You must unlearn that which you have learned."
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