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post #1 of 10 Old 06-06-2013, 10:25 AM Thread Starter
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Off set question. KMC rockstars

Hey,

Looking into getting 20" KMC RockStars
And running a 35" tires my truck is lifted 6 inches

What offset do I need. Looks like the options are ..+10 +35 +50

What exactly is the offset ?

Anything else to think about before the purchase ?

Thanks a lot Zach

2002 F-350 ext cab short box


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post #2 of 10 Old 06-06-2013, 01:55 PM
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Offset has to do with the relationship between the rim centerline and mounting flange. That being said, for best results, your desired wheel width is needed.

However, on pre 2005 trucks, a 10" wheel with a 4.25~4.5 backspace, or -25 offset, works fine.

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post #3 of 10 Old 06-06-2013, 06:35 PM Thread Starter
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The tire size is going to be 35/12.5/20


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2002 F-350 7.3 ex-cab short bed Beans 6 Pos
6 inch lift, 35,s, 4 Inch Turbo Back, 6637 intake
Foil delete, 05 harley front end, 08 Tailights
Tinted cab lights, and this and that and this
Z-STROKE is offline  
post #4 of 10 Old 06-06-2013, 07:01 PM
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Yeah, kinda figured that, but your question can't be answered without a width. A -50 offset can be applied to every thing from a 5.5" wide rim on up. So, without a width, you're asking an incomplete question.

Karl and his 2003 6.0

Barefoot Accelerator Pedal
TRICO Force wiper blades
Yellow Military Aircraft Valve Stem Caps
Offensive "Stick Family" Decal
Big Ol'Honkin 1 1/4" Shank Receiver Hitch


WHAT!?! I was trying to list stuff that everyone else
hasn't already listed for their truck!

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post #5 of 10 Old 06-06-2013, 09:28 PM Thread Starter
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Rim is 10" wide
Sorry I thought u meant tire width not rim width
Thanks Zach


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2002 F-350 7.3 ex-cab short bed Beans 6 Pos
6 inch lift, 35,s, 4 Inch Turbo Back, 6637 intake
Foil delete, 05 harley front end, 08 Tailights
Tinted cab lights, and this and that and this
Z-STROKE is offline  
post #6 of 10 Old 06-06-2013, 09:33 PM
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Like Karl said, you need a negative offset. None of the + offsets you posted will work.

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post #7 of 10 Old 06-06-2013, 09:37 PM
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1999 - 2004 require no more than 4.25~4.5 backspace. Maybe this will help.
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Karl and his 2003 6.0

Barefoot Accelerator Pedal
TRICO Force wiper blades
Yellow Military Aircraft Valve Stem Caps
Offensive "Stick Family" Decal
Big Ol'Honkin 1 1/4" Shank Receiver Hitch


WHAT!?! I was trying to list stuff that everyone else
hasn't already listed for their truck!

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post #8 of 10 Old 06-06-2013, 10:10 PM Thread Starter
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Still not completely understanding

I'm going to be running a 35/12.5/20 on a 20"x10" Rim

What's backspacing vs offset ?

Why are some # -25, -50 VS.. 4.00, 4.25

Thanks


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2002 F-350 7.3 ex-cab short bed Beans 6 Pos
6 inch lift, 35,s, 4 Inch Turbo Back, 6637 intake
Foil delete, 05 harley front end, 08 Tailights
Tinted cab lights, and this and that and this
Z-STROKE is offline  
post #9 of 10 Old 06-07-2013, 06:33 AM
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Offset relates to the centerline of the wheel, negative offset pushes the wheel away from the vehicle, positive pulls it in, and is measured in mm.

Backspace is the distance from the inboard wheel lip to the mounting flange, and is measured in inches.

For example, a 10 inch wheel with -25mm offset will have a 4.5" backspace.

Finally, inches/25.4=mm.

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Karl and his 2003 6.0

Barefoot Accelerator Pedal
TRICO Force wiper blades
Yellow Military Aircraft Valve Stem Caps
Offensive "Stick Family" Decal
Big Ol'Honkin 1 1/4" Shank Receiver Hitch


WHAT!?! I was trying to list stuff that everyone else
hasn't already listed for their truck!

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post #10 of 10 Old 06-07-2013, 01:46 PM Thread Starter
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Thanks for the help guy's


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2002 F-350 7.3 ex-cab short bed Beans 6 Pos
6 inch lift, 35,s, 4 Inch Turbo Back, 6637 intake
Foil delete, 05 harley front end, 08 Tailights
Tinted cab lights, and this and that and this
Z-STROKE is offline  
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