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Discussion Starter #1 (Edited)
I have an 07 base 2wd, I guess its a z85. The "expert" at discount tire is saying my stock wheels are 15x6.5 43mm offset... the wheels on my truck are only 23mm. the new wheels iim looking at are 18x8.5 10mm, they're trying to tell me that these wheels will stick out 2" past the fender. Here is a link.

Wheel Details - Discount Tire Direct
 

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That idiot is smarter than you think - what he said is true.

6.5 +41 are stock Z85 wheels. You can confirm by the manufacturer sticker on the driver side door jamb (for the width) However, your factory wheel may only be 6" wide if you have the steel wheels. You can pull your wheels and look for a stamping on the inside for the offset. My 2008 Z85 wheels are stamped +41.

Factory backspace is 5.2". The wheel spec you listed is 5.4" (tucked in 1/4" more than stock). However the wheel is 2-inches wider therefore it will poke a lot. That 2" difference in width has to go someplace....right?

The stock tire is probably P225/75-15. that is pretty appropriate for a 6.5" wheel...if you look at a tire of your choice in an 18" wheel you can cross reference what width wheel is approved by the tire manufacturer. Because of the larger wheel and shorter sidewall (removing 3" of rubber), you might be able to get a slightly more narrow tire than 265 to fit on an 8.5" wheel.

Go ahead and call me an idiot if you wish.
 

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Discussion Starter #3
Yeah I punched it in on the calculator and came up with pushing it 37mm out. they are 15" aluminum wheels that are on it, and they say 23mm.

Now the question is whether to go with a:

18x8 +35

or

20x8.5 +35

Planning to do 3/4 drop in the future. What is recommended?
 

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Unfortunately I am useless for lowering....

The +23 factory offset sounds suspicious. Again, useless for that too then.

I can only assist with tire/wheel sizing for stock and lifting.
 

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I wonder if the +23 is a 2wd offset wheel. My truck is 4x4.

Assuming stock tire is 225/75-15, the 255/35-20 is about 1.25" shorter than stock.

According to the calculator, an 8.5" wheel at +35 gives a backspace of 6.1" which I believe is too far tucked and will rub with a 255 tire. I know that twill not work on a 4x4.
 

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Discussion Starter #7
Looks like a lot of people are running that setup judging by the lowered wheel chart, I went ahead and ordered wheels and tires
 

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The lowered wheel/tire chart is definitely going to be your best bet on what will/won't work, just make sure you're paying attention to the mods listed for the size you want.

And imo, 20's on these trucks lowered look great. Make sure to post pics!
 

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I am running 20x9 with +25 offset and they still tuck if you are looking for that look. Also on 255/35/20 tire

Before I was running a 20x9.5 with a +35 offset and it stuck out about 1.5 inches. I hope this helps

20x8.5 +35 with a 255/35/20 should be fine on stock suspension, correct?
With a 3/4 drop, you will have a lot of gap on a Z85
 

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How d'ya like them apples
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This is a 5/6 drop on 20x9 with 255/35/20 tire
 

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How d'ya like them apples
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It's not that bad, as long as you have a low pro cross member
 

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I have a stock 2005 z85 ls I want 18x9 wheels which offset should I get?
Well this kind of leaves alot of options without all the info. What size tire will you be running and what look are you going for? tucking the wheels or more of an offroad look?
 

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I have a stock 2005 z85 ls I want 18x9 wheels which offset should I get?
I will assume you drive 2wd, and wish to run a lower profile type tire?

I have to ask, but 9" wheels are pretty wide unless you start getting into a lower profile tire. Lower profile tires can be run on wider rims than a taller profile.

Also as mentioned, please describe more of your intentions.
 

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Im kind of wanting to go with an offroad look maybe later down the line when I have the funds and yes its 2wd im not necessarily wanting a low profile tire. Would you suggest I go 18x8
 

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What size tire do you think you want to go with?
An example is your stock tire size is 225/75-15 (28.3").
If you went up to a 235/55-18 you would get nearly the same size (28.2). I don't know if that size is available, but you can tell how the sidewall being reduced gives you the overall height.

What you need to do is check the tire web sites (a tire that you are considering to use) for the size you want to go with and see what they recommend for wheel size. Perhaps a 235/55-18 has a recommendation of 9" wide wheels.
They all vary a little bit.

The various tire manufacturers have a chart with the recommendations listed on their web pages.
 
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