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Old 06-06-2013, 09:25 AM
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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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Old 06-06-2013, 12:55 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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Old 06-06-2013, 05:35 PM
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The tire size is going to be 35/12.5/20


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Old 06-06-2013, 06:01 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.
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Old 06-06-2013, 08:28 PM
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Rim is 10" wide
Sorry I thought u meant tire width not rim width
Thanks Zach


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Old 06-06-2013, 08:33 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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Old 06-06-2013, 08:37 PM
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1999 - 2004 require no more than 4.25~4.5 backspace. Maybe this will help.
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Off set question. KMC rockstars-offset-backspace-chart.jpg  
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Old 06-06-2013, 09:10 PM
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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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Old 06-07-2013, 05:33 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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Old 06-07-2013, 12:46 PM
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Thanks for the help guy's


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