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Stock 2500 HD Rim Offset / Backspacing


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#1 GreyElf

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Posted 23 August 2006 - 03:32 PM

Hey all...new to this forum...

Can't seem to find any info on my stock rims' offset / back spacing (16x6.5). I know I can remove the tire and measure it myself, but was hoping to avoid that.

Does anyone know what it is?

It's for a 2004 Sierra 2500 HD SLE Crew/4x4...it was equipped with the forged alloy wheels that are normally only available on the SLT.

Basically, I may want to do the Fabtech 9" Coilover Conversion w/Uniball, and need to pick out new rims that won't rub w/37" tires.

I was told by Discount Tires that I'd need something between a -6 to a +12 offset for 33's or 305's, but wondering what I'd need for 37's.

Is there a calculator out there anywhere where I can key in the make/model/tire size to determine optimal rim offset?

Thanks in advance

Edited by GreyElf, 23 August 2006 - 03:51 PM.

Grey ~<}:^>
2004 GMC Sierra 2500 HD SLE Crew/4x4 - 6.6L Duramax Turbo Diesel
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#2 GMCHD4x4

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Posted 24 August 2006 - 12:24 AM

4.5" bs would work im thinking ?

'06 GMC Sierra 2500HD SLE CC 6.0L

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Mods: Factory Touch Nav w/ Back up Camera, Factory DVD, Magnaflow, Westers Tune, 20x9 Incubis Chrome, 305-55 DC's, 4300K HID's in the Low Beams and Fogs


#3 GreyElf

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Posted 24 August 2006 - 03:26 PM

4.5" bs would work im thinking ?

<{POST_SNAPBACK}>

Thanks CHevyHD4x4,

I had heard somewhere else that it might be closer to 5" for my truck with a 10"-wide wheel.

Also found the formula:
offset = (backspace - (Rim Width in inches / 2)) * 25.4 (to convert inches to mm)

So assuming the formula is correct, that'd give me:

-12.7mm offset on a M/T Classic II or Procomp 1079 16x10 rim with BS of 4.5, or

0mm offset on the M/T Classic II 17x9 w/BS of 5", or

-6.35mm on the Procomp 1079 17x9 w/BS of 4.75"

Still wondering whether that'd clear all the brake/suspension hardware since my current wheel is only 6.5" wide (assuming it had 0 offset, that'd only put the inner rim edge 3.25" back from center toward the brake, whereas a 10" rim w/0 offset puts it back 5", so a difference of almost 2 inches).

Does that sound right?

So, that's why I'm wondering what the actual offset is on the stock 6.5" rim; it'll tell me if it's more or less than 3.25 BS and give me a better idea on how much room I have to play with on the wider rim.

Thanks,

Edited by GreyElf, 24 August 2006 - 03:56 PM.

Grey ~<}:^>
2004 GMC Sierra 2500 HD SLE Crew/4x4 - 6.6L Duramax Turbo Diesel
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#4 GMCHD4x4

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Posted 24 August 2006 - 11:13 PM

I 'think' stock is 5.5 bs

I know a H2 rims is becasue I used to run them and when I upgraded toa Conginto leveling kit It was spacer or more Bs. i went for more BS 4.5BS is what Im running.

Edited by CHevyHD4x4, 24 August 2006 - 11:13 PM.

'06 GMC Sierra 2500HD SLE CC 6.0L

Posted Image


Mods: Factory Touch Nav w/ Back up Camera, Factory DVD, Magnaflow, Westers Tune, 20x9 Incubis Chrome, 305-55 DC's, 4300K HID's in the Low Beams and Fogs


#5 GreyElf

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Posted 27 August 2006 - 05:03 PM

I think you may be right. I had another look (just eyeballing it), and it seemed that the bolt plane was only about an inch or inch-and-a-half back from the front of the rim.

So a 4.5 bs (or there abouts) should work.
Grey ~<}:^>
2004 GMC Sierra 2500 HD SLE Crew/4x4 - 6.6L Duramax Turbo Diesel
ŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻ

#6 Jacqson

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Posted 01 September 2006 - 12:43 AM

Hey all...new to this forum...

Can't seem to find any info on my stock rims' offset / back spacing (16x6.5).  I know I can remove the tire and measure it myself, but was hoping to avoid that.

Does anyone know what it is?

It's for a 2004 Sierra 2500 HD SLE Crew/4x4...it was equipped with the forged alloy wheels that are normally only available on the SLT.

Basically, I may want to do the Fabtech 9" Coilover Conversion w/Uniball, and need to pick out new rims that won't rub w/37" tires.

I was told by Discount Tires that I'd need something between a -6 to a +12 offset for 33's or 305's, but wondering what I'd need for 37's.

Is there a calculator out there anywhere where I can key in the make/model/tire size to determine optimal rim offset?

Thanks in advance

<{POST_SNAPBACK}>



If you have the stock factory Aluminum wheels which by the way are not forged, you will have 5" BS. These wheels only have a load rating of about 2400lbs per wheel.
2011 Chevy Silverado 3500HD CCSB Dmax/Allison Taupe Gray Metallic.


For Sale-My loaded up 2002 2500 Suburban




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