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Old 05-05-2013, 05:08 PM   #1
Join Date: Oct 2006
Posts: 28
Chhosing new wheel backspace (pics)

So I'm moving from 31x10.5 to 33x12.5 tires on stock suspension (with high clearance fenders). I test mounted a 33" on the factory 15x7 grizzly rim (5.5" backspace) to see what kind of backspace I will need when I get 15x8 steelies.

In the rear the 31" inside clearance is about 1", with 33" it's only 1/4".

In the front, 31" is 3" from tower and couple washers keep it off the LCA and sway bar. With 33" the tower is 2" but just barely clears LCA and hits sway bar.

Currently with both tires on factory rims, the edge of the tread is even with the edge of the flares. I know that 15x8 will also move the center of the tire out 1/2", meaning the inside sidewall will move out approximately 1/4". Seeing these pics, would you recommend 4" or 4.5" backspace to provide proper clearance without sticking the tires out too far? 4.5" will return the inner sidewall clearance to what the 31" had, and 4" will add another 1/2" more clearance than the 31"s but stick out even further outside.

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Old 05-05-2013, 06:22 PM   #2
thgr8alex's Avatar
Join Date: Dec 2012
Posts: 1,639
3.75 will stick it out alot with 33x12.5 on 15x8
See pic with no flares:

Attachment 245551

So if you dont want it sticking out too much id go with 4.5. Are you running stock flares or do you have wider aftermarket flares? because that will affect it sticking out too

1998 Jeep Wrangler, 4.0 I6
33x12.50 Goodyear Wrangler Duratracs
3 inch Zone suspension lift, Rubicon Express adjustable front track bar, 1.25 inch body lift.
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Old 05-05-2013, 06:45 PM   #3
Join Date: Oct 2006
Posts: 28
I have stock flares now and will be upgrading to metalcloak fenders soon. Id rather run 4" flares and avoid the wide fender or skateboard tire look. How much inner sidewall clearance is preferred for flexing on a stock suspension?
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Old 05-06-2013, 07:27 AM   #4
Join Date: Oct 2006
Posts: 28
Anyone confirm if 4.5 backspace is enough for 33x12.5 on a stock suspension?
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Old 05-06-2013, 08:40 AM   #5
PStov98TJ's Avatar
Join Date: Dec 2012
Location: Long Beach, Mississippi
Posts: 2,021
Originally Posted by Hamster View Post
Anyone confirm if 4.5 backspace is enough for 33x12.5 on a stock suspension?
It's generally considered to not really be enough. The minimum is generally accepted to be 4.25" with the most needed being 3.75".
OME 2.5" coils and Nitro Shocks, Metalcloak front track bar, JKS Quick discos, 33x12.50 Goodyear MTR's w/Kevlar, 15x8 Pacer wheels, thedirtworx rear tire carrier
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