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Old 12-05-2015, 11:24 PM
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Wheel sizing question

I've decided to ditch the 20" wheels and get 18" on my 2012 Overland Summit. However, in researching what I want verses what I need, I think I've confused myself. It mainly boils down to offset and wheel width. Currently, I have the stock 20x8 wheels. Here are my points of confusion:

1) Everywhere I have looked states the offset for the stock wheels as 35. However, the markings on the inside of the wheel indicate the size as 20x8 56 (here is a pic):
FullSizeRender.jpg
So, which is it? Or, am I reading the markings on the wheel wrong? To me, the wheels look very flat, and do not have much of a concave look at all, so they lead me to believe they are 56, not 35 as stated in various places, including here. Do the 20" wheels on the 2012 GC Overland Summits have a 56 offset?

2) How does the wheel width affect the offset? If I go with a 9" wide wheel, will I need to get a wheel with a smaller offset to push it away from the suspension/brakes or can I keep the same offset (I really don't like the concave look of lower offset rims)?

3) How does changing the offset affect the handling and wear on the components? This is pretty important to me.

Like I said: I've read a lot of stuff on this, both here and on various tire sites and I think I just confused myself.

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Old 12-06-2015, 07:03 PM
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Re: Wheel sizing question

I would consult the Jeep people just to be sure. I like the 18" wheels for the purposes of off road and Winter driving too but I bought a Limited back from the 2011 series. I just don't know what you would have to do. Maybe wheel spacers or something. Tire and suspension stores should have some basic information as well. I would think if thrived all size of the wheel and tire was similar, no modifications would be necessary.
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Old 12-06-2015, 08:42 PM
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Re: Wheel sizing question

Quote:
Originally Posted by BD Jones View Post
I've decided to ditch the 20" wheels and get 18" on my 2012 Overland Summit. However, in researching what I want verses what I need, I think I've confused myself. It mainly boils down to offset and wheel width. Currently, I have the stock 20x8 wheels. Here are my points of confusion:

1) Everywhere I have looked states the offset for the stock wheels as 35. However, the markings on the inside of the wheel indicate the size as 20x8 56 (here is a pic):
Attachment 62957
So, which is it? Or, am I reading the markings on the wheel wrong? To me, the wheels look very flat, and do not have much of a concave look at all, so they lead me to believe they are 56, not 35 as stated in various places, including here. Do the 20" wheels on the 2012 GC Overland Summits have a 56 offset?

2) How does the wheel width affect the offset? If I go with a 9" wide wheel, will I need to get a wheel with a smaller offset to push it away from the suspension/brakes or can I keep the same offset (I really don't like the concave look of lower offset rims)?

3) How does changing the offset affect the handling and wear on the components? This is pretty important to me.

Like I said: I've read a lot of stuff on this, both here and on various tire sites and I think I just confused myself.

Stock wheels are 20x8 ET56

This page will give you a visual on offsets.
Online Wheel and Tyre Fitment Calculator. Offset, Tyre Stretch and Speedo Error | Will They Fit

Offset is important when it comes to fitment.
It has a direct correlation how far out or far in or towards the center of the car or how far out. To far in and you will hit suspension/brake components and too far out you'll be past the fender which wont be visually appealing.
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