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Old 02-07-2009, 09:41 AM   #1
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Rim Backspacing for 33x12.50 tires

I just installed a 4" Tuff Country EZ-Ride lift kit on my 2006 Wrangler 65th Anniversary edition. I want to use 33x12.50 Goodyear Wrangler Silent Armor tires. The question is how much backspacing would i need on my rims to prevent rubbing.

I like these ones
Mickey Thompson Performance 158421 - Mickey Thompson SideBiter® Alloy Wheel for Jeep® Vehicles with 5x4.5 Bolt Pattern - Quadratec
Would they work?

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Old 02-07-2009, 09:55 AM   #2
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yes


welcome to the forum. Got pics?

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Old 02-07-2009, 10:02 AM   #3
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I don't have good pics yet my jeep was all stock till' yesterday when the lift went on.

so those Mickey Thompson wheels would work.


Thanks for your help
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Old 02-07-2009, 11:01 AM   #4
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First, for that size tire, I strongly recommend a 15x8 wheel and not a 15x10. If you offroad, a 15x8 wheel will make it easier for an aired down tire to remain seated and air tight than it could on a 15x10 wheel.

And while the 3 5/16" backspacing of the 15x8 Mickey Thompson will work, your tires won't rub at all, that's not much backspacing and your tires will protrude way out of the wheelwell. That isn't good for a few reasons... less trail clearance, increased scrub radius (the tire scrubs an arc when you turn the steering wheel instead of pivoting about a point on the ground), and it's harder on the wheel bearings.

I really (!) like the styling of Mickey Thompson's wheels but I won't buy them due to the small amount of backspacing they have on 15x8 wheels. That's why I ended up going with American Racing this last go-around, they at least had 3.75" of backspacing. Ideally, I believe 3.75 to 4.25" or even 4.5" of backspacing to be ideal for a 33x12.50 or 35x12.50 size tire.
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Old 02-24-2009, 01:02 PM   #5
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Jerry, what you are saying is the 33x12.5 will work on a 15x8 wheel with 3.75 to 4.25 inches of backspacing, will it rub on my 06 TJ if I get a 2" BB with new coils and shocks?
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Old 02-24-2009, 01:15 PM   #6
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Yes, a 33x12.50 works perfectly on a 15x8 with 3.75" to 4.25" of backspacing. Actually it even works fine with up to 4.5" of backspacing if you add a washer or two under each of the two steering stop bolts to stop the minor rubbing that can happen with 4.5" of backspacing.

However, a 2" BB is not tall enough for 33" tires. 3" of lift is the absolute minimum with 4" being recommended for offroading with a disconnected front antiswaybar. I guess you could get away with a 2" BB if you also added a 1" body lift but some rubbing should be expected offroad.
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Old 02-24-2009, 01:31 PM   #7
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I know its been said before, but jerry, YOU DA MAN!
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Old 02-24-2009, 01:33 PM   #8
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and I guess Ill go with 32s then, Im really just looking for a wider, more aggressive stance with a budget boost
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Old 02-24-2009, 02:51 PM   #9
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Quote:
Originally Posted by Jerry Bransford View Post
First, for that size tire, I strongly recommend a 15x8 wheel and not a 15x10. If you offroad, a 15x8 wheel will make it easier for an aired down tire to remain seated and air tight than it could on a 15x10 wheel.

And while the 3 5/16" backspacing of the 15x8 Mickey Thompson will work, your tires won't rub at all, that's not much backspacing and your tires will protrude way out of the wheelwell. That isn't good for a few reasons... less trail clearance, increased scrub radius (the tire scrubs an arc when you turn the steering wheel instead of pivoting about a point on the ground), and it's harder on the wheel bearings.

I really (!) like the styling of Mickey Thompson's wheels but I won't buy them due to the small amount of backspacing they have on 15x8 wheels. That's why I ended up going with American Racing this last go-around, they at least had 3.75" of backspacing. Ideally, I believe 3.75 to 4.25" or even 4.5" of backspacing to be ideal for a 33x12.50 or 35x12.50 size tire.

There 16x8 wheels have much better backspacing.

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