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OEM 19x10 C6 Rims For FRONT...Check My Math Please

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Old 02-06-2008, 04:11 PM
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Default OEM 19x10 C6 Rims For FRONT...Check My Math Please

I've got four OEM 19x10 silver C6 rims (79mm offset) that I just mounted 275/30/19 Michelin Pilot Sport A/S tires on to run at all 4 corners. Pics can be seen here:

http://www.banddirector.cz28.com/photo2_1.html

I've already got 1.25" spacers for the rear, but I need a double check on my math to run the 19x10's on the front. It seems replica 19x10's that fit the F-Body use a 56mm offset. The OEM rims have a 79mm offset. 79mm - 56mm = 23mm. A 1" adapter is 25.4mm. Is it that simple or am I missing something? A 1" adapter is what I need to purchase, correct?

(It seems running the 1.25" adapter is common knowledge for the 79mm offset 19x10's on the rear, so that's what I bought for the rear.)

I just wanted to make sure before I order the 1" and then discover I actually needed the 1.25" for the front too.

TIA!
Old 02-07-2008, 02:34 PM
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Bottom line:

Do I need 1" adapters or 1.25" adapters to fit on the FRONT?

Last edited by BandDirector Blk98ZM6; 02-07-2008 at 05:15 PM.
Old 02-08-2008, 08:26 AM
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Originally Posted by BandDirector Blk98ZM6
I just read all 42 pages in this post!

Anyway, my question:

19x10 OEM C6 rim with 79mm offset with 275/30/19 tires. I need to fit on the FRONT of '98 Z28. 1" adapter or 1.25" adapter?
My best guess . . 1.25" or 31.75 mm . .

I run 38 mm 9.5" on the front of my SS, so . . 79 mm - 31.75mm = 47.25 mm

It would move the wheel ~ 10 mm inwards compare to mine, and your wheel is 6.35 mm wider each side . .

Again, I am only guessing by my math calculations.

And FYI, no need to post in both theforum & the Stick I read virtually EVERY thread posted. . . .
Old 02-08-2008, 02:39 PM
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Thanks Xsta Z 28!


Originally Posted by Xsta Z 28
And FYI, no need to post in both theforum & the Stick I read virtually EVERY thread posted. . . .
No problem...after I didn't get an answer here 24 hours after I posted, I went and read the 40+ pages of the sticky and thought this question should be in there too, so that's why I asked there as well.
Old 02-08-2008, 03:18 PM
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I see you actually have the wheels. You may also want to mock it up.

Remove one wheel and tire. Set the lower A-Arm onto a block built to the regular ride height. Slide the 10" wheel on and see how far it can go on before the hoop gets too close to the spindle . . .

Just a thought.
Old 02-08-2008, 03:34 PM
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My problem is I'm lazy I guess I've already got a pair of 1.25" spacers and yes, I had the tires mounted and balanced earlier in the week. I guess I just need to go head to the garage and install the 2 spacers and the both rims/tires on one side of the car and see what happens.

The reason I was wanting to know about 1" spacers is that it seems to me that the stock rims/tires actually stick out further on the front than in the rear (not as bad as the early last generation of Mustangs mind you), so if I could bring them in 1/4" by just going with a 1" adapter, I thought that might be an option.

Do the front and rear tires run in the same track on 4th Gen F-Bodies, or are the rears brought in just a little from the fronts?
Old 02-08-2008, 04:31 PM
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1 inch adapters are hard to find because in most cases they need at least 1.25 for the lug and lug nut.
Old 02-08-2008, 06:54 PM
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Originally Posted by TomZwheels
1 inch adapters are hard to find because in most cases they need at least 1.25 for the lug and lug nut.
eBay usually has 2 or 3 vendors carrying 1" adapters for around $55 per pair and 1.25" adapters usually run around $60 per pair. I bought my 1.25" off of eBay and they seem to be well built, but I guess time will tell. Eibach wants like $120 or somewhere around that price for a pair of adapters!

I also realize if I tried to go with the 1" adapters, I'd probably have to cut part of the unthreaded tip off of the front studs...not sure I want to do that...
Old 02-09-2008, 03:17 PM
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Weather's nice today, so I went out and did a test fit. The 1.25" spacers are going to work well. It's VERY close in a couple of spots, so I'd be afraid the 1" spacers might make it too close. I'm going to order another set of 1.25" adapters and see how it all works out once I bolt everything down tight and go for a serious drive.




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