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Go Back   Hummer Forums by Elcova > Hummer H2 Discussion Forums > Technical Discussion and Customizing your H2

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  #1  
Old 10-31-2012, 05:06 AM
zdawg8394 zdawg8394 is offline
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Default backspacing and offet

i have a feeling this has been asked but i cant find anything but anyways,

i plan on running either mht fuel throttle, or fuel krank rims. in 20 inch

and a 37 by 13.50 toyo mt

what backspacing and offset would be recommended, and also what rim width 9 or 10?

i have a 2 inch leveling kit and cognito upper a arms.

tia!
__________________
06 H2 SUT
-gobi ranger rack
-4 piaa 520
-hummer double brush guard
-vision x rock lights
-5%tint all around
-dual "whips"
-leveling kit
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  #2  
Old 10-31-2012, 08:50 AM
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[__--MUD--__] [__--MUD--__] is offline
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Default Re: backspacing and offet

-25mm, about 1"

You want a 10" wheel.
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  #3  
Old 10-31-2012, 07:18 PM
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KT2T KT2T is offline
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Thumbs up Re: backspacing and offet

I just put Fuel Revolver 20" x 10" wheels on my H2 and of the two available backspacing specs, 4.5" (-24mm ET) and 5" (-12mm ET), I chose the 5" backspace (-12mm ET). I used this site to help make my decision:

Code:
http://www.rimsntires.com/

They have a truly excellent site for giving you a visual representation, as well as notes for wheel well and suspension clearance, when comparing your stock setup to a proposed setup for a new tire/wheel combination. To get the full breakdown, they only allow limited access to that data before kicking you out since they want to be paid for heavy users. Since you may not be able to justify the cost for a one-time deal, even though you might need to try many permutations to find the right recipe, there is a work-around. If you are using Google Chrome, open a new incognito window and use this URL:

Code:
http://www.rimsntires.com/specspro.jsp?item=Wheel-Tire%20size%20comparer&sw1=315&ar1=70&bd1=17&rw1=8.5&et1=18&sw2=335&ar2=65&bd2=20&rw2=10.0&et2=-12

That's long and ugly, but I'll break it down for you. The latter half of the URL specs the existing wheel/tire combination and then the new combination as follows:

Code:
sw1=315&ar1=70&bd1=17&rw1=8.5&et1=18&sw2=335&ar2=65&bd2=20&rw2=10.0&et2=-12

Code:
sw1=315 ar1=70 bd1=17 rw1=8.5 et1=18 sw2=335 ar2=65 bd2=20 rw2=10.0 et2=-12

So, you can see how to structure the URL to get exactly what you need for different tire and wheel combinations. The first set of specs is the stock setup of the H2 and the second set represents my Fuel Revolver 20" x 10" (-12mm ET / 5" backspace) with an approximate spec for the Interco 37" x 13.50" x 20" tires that I wanted. Keep in mind that they don't have support for high-flotation tire specs so you'll have to make a rough estimate like I did (using 335/65R20 to represent 37x13.50x20). If you need help with this approximation then let me know and I can post a reply with a huge file of script-generated mathematical conversions.

Have fun.
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2008 H2 LUX, graystone, rear air suspension (stock), U-steps, SMA brushguard w/valance (DRLs replaced by PIAA 520s), black taillight guards, black locking fuel door, four black roof crossbars, Cognito UCA, Bilstein shocks, Rancho steering stabilizer, Cognito pitman/idler support kit, Kryptonite tie rods, green keys, Fuel D525 20" Revolver, Interco SS M16 37x13.50

Last edited by KT2T : 10-31-2012 at 07:20 PM.
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  #4  
Old 10-31-2012, 07:20 PM
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Default Re: backspacing and offet

Note some of the lifts out there require -25mm wheels. Pretty sure fabtech is one of them.
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  #5  
Old 10-31-2012, 07:22 PM
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Default Re: backspacing and offet

Good point MUD, I should have noted that I am not running a lift. I do have the GM green keys on my torsion bars and the Cognito leveling kit (UCAs, shocks) and also some of their steering support stuff.
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Mike Oliver, KT2T | m@fifo.io | +1-863-606-8008 | US/FL/Lakeland

2008 H2 LUX, graystone, rear air suspension (stock), U-steps, SMA brushguard w/valance (DRLs replaced by PIAA 520s), black taillight guards, black locking fuel door, four black roof crossbars, Cognito UCA, Bilstein shocks, Rancho steering stabilizer, Cognito pitman/idler support kit, Kryptonite tie rods, green keys, Fuel D525 20" Revolver, Interco SS M16 37x13.50
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  #6  
Old 11-01-2012, 10:28 PM
zdawg8394 zdawg8394 is offline
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Default Re: backspacing and offet

Quote:
Originally Posted by [__--MUD--__]
-25mm, about 1"

You want a 10" wheel.


i apreciate it!
__________________
06 H2 SUT
-gobi ranger rack
-4 piaa 520
-hummer double brush guard
-vision x rock lights
-5%tint all around
-dual "whips"
-leveling kit
Reply With Quote
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