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C6 rim question

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Old Mar 20, 2014 | 09:23 PM
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Default C6 rim question

My 89 Z51 has 275/40/17 with a 56 mm offset.

I'm planning on purchasing 2007 C6 rims
Fronts are 245/40/18 with 56 mm offset
Rears are 285/35/19 with 79 mm offset

So...the fronts... the offset is the same but going from a 275 to a 245, should I put a 1" adapter so the tires will meet the edge of the fender as they do now?

The rears..from 56 mm to 79 mm is 23 mm difference, so I know I'll get a 1" adapter for the rears.

I suppose my real question is the front, even though the offset is the same, should I get a 1" adapter so the tires meet the edge of the fender/hood?
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Old Mar 20, 2014 | 09:25 PM
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And now that you're here, does this ebay auction look like the right adapters to get?

http://www.ebay.com/itm/4pc-1-inch-5...6b9811&vxp=mtr
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Old Mar 21, 2014 | 12:14 AM
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Yes and Yes....though technically, you might wish you had thicker spacers on the rear -- assuming you want flush fit. I think RimsAndTires.com has a good webpage to give you the best visual.

Might be the specs folder. (RimsAndTires.com/SPECS.html (or something like that)
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Old Mar 21, 2014 | 12:35 AM
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My 94, same suspension as your's.
No spacers on front.



1.5" on the rear. (a little too much)

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Old Mar 21, 2014 | 12:49 PM
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Thanks guys. I think I'll go with the 1" spacer in front and I like the stance of the 1.5" spacer in the rear. Looks badass.

I'll be a combo of both your cars
I'll be sporting chrome rims like jonnymo63 and a hood like GREGGPENN (it's on order at the moment)
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Old Mar 21, 2014 | 01:27 PM
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This was one of the first startups after putting the engine back in. Timing and idle speed not yet set.


Last edited by black_89_vette; Mar 21, 2014 at 01:30 PM.
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Old Mar 21, 2014 | 01:44 PM
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Originally Posted by black_89_vette
My 89 Z51 has 275/40/17 with a 56 mm offset.

I'm planning on purchasing 2007 C6 rims
Fronts are 245/40/18 with 56 mm offset
Rears are 285/35/19 with 79 mm offset

So...the fronts... the offset is the same but going from a 275 to a 245, should I put a 1" adapter so the tires will meet the edge of the fender as they do now?

The rears..from 56 mm to 79 mm is 23 mm difference, so I know I'll get a 1" adapter for the rears.

I suppose my real question is the front, even though the offset is the same, should I get a 1" adapter so the tires meet the edge of the fender/hood?
You don't make any mention if you're wanting to buy "replica" wheels or actual C6 OE/GM wheels. There's more that needs to be considered than what you mention.

You never mention the actual wheel width - those are important and need to be established "FIRST". If the fronts are 9.5 and 56mm you want NO spacer - don't even consider it!

If the rears are 10.0 and 79mm you don't want to even think about the 1.5 either. A 19mm would push the tire/wheel as a package out minimally from a stock location and a 25mm probably is the max for a "good fit".

Originally Posted by black_89_vette
Thanks guys. I think I'll go with the 1" spacer in front and I like the stance of the 1.5" spacer in the rear. Looks badass.
There will be nothing "badass" with your mentioned intentions. Nothing!
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Old Mar 21, 2014 | 02:07 PM
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I was referring to OEM C6 rims.

The fronts on OEM C6 rims are 8.5". Seeing that they are 245 on an 8.5" rim, I believe the added 1" adapter to the fronts will run the tires flush to the fender, therefore I am definitely considering it.

I figured that since the stock 89 rim was 56 mm offset and the C6 OEM was 79 mm, the difference of 23 mm was very close to 1". But after seeing johnnymo63's car, I liked the way it looked on his.

I think the way his car looks fit my definition of "badass", so I'm going to go with that.
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Old Mar 21, 2014 | 02:55 PM
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Originally Posted by WVZR-1
There will be nothing "badass" with your mentioned intentions. Nothing!
well thats a little unnecessarily harsh i think the rims on the red car look sweet and will look good on his too.
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Old Mar 21, 2014 | 04:03 PM
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Originally Posted by solaris_vii
well thats a little unnecessarily harsh i think the rims on the red car look sweet and will look good on his too.

Harsh - maybe but with the "tire/wheel" that far out of the wheel-house in the rear there's no way to accommodate the ride height without creating issues. That ain't "badass" - the OP's tire choice for the rear is over 1" taller than a 275/17 so that needs to be tolerated.

Anything other than a very smooth hi-way could create issues.

The OP mentions now the wheel widths so I'd consider the front at 1" and that will be quite close to what he expects for a fit to the hood edge.

The OP's choice amounts to cranking nearly an 1 1/4 of height into the rear spring height at it's current stance with the 275/17 I'd guess are there presently. Take a closer look at the ground clearances in the side profile image of the red car!
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Old Mar 22, 2014 | 08:33 AM
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My car is lowered, somewhat, but I have never had any contact issues on the roads around here.
Here's another angle of the rear.

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Old Mar 22, 2014 | 09:33 AM
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Originally Posted by WVZR-1
Harsh - maybe but with the "tire/wheel" that far out of the wheel-house in the rear there's no way to accommodate the ride height without creating issues. That ain't "badass" - the OP's tire choice for the rear is over 1" taller than a 275/17 so that needs to be tolerated.

Anything other than a very smooth hi-way could create issues.

The OP mentions now the wheel widths so I'd consider the front at 1" and that will be quite close to what he expects for a fit to the hood edge.

The OP's choice amounts to cranking nearly an 1 1/4 of height into the rear spring height at it's current stance with the 275/17 I'd guess are there presently. Take a closer look at the ground clearances in the side profile image of the red car!
ok well thats some good info right there, makes sense
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