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What offset for a 285 on the front?

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Old 02-11-2018, 10:09 PM
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Pwnage1337
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Default What offset for a 285 on the front?

I'm planning on ordering some Forgestar CF5's, and want to run a 19x11 rear, with an 18x10 front. They are custom built so I'm curious if anyone is running a 285 or something close on the front.

My car is an 85, stock offsets were 32 for standard and 38 for Z51 if i'm not mistaken. Can I just run 36mm like the ZR-1 wheels?


Thanks in advance,


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Old 02-12-2018, 04:47 AM
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Have you had 11 @36 on the rear already?

No experience with an early car but 10 @32 would duplicate the 'inner' clearance that's present with the 9.5 @38.

What do you have on the fronts presently? Do your comparisons from what is 'known' to you!
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Old 02-12-2018, 02:49 PM
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Haven't ran that big of a tire on the back yet, just stealing the offset from the ZR1 wheel that apparently just bolts right on to the early C4s.

I have C6 oem wheels on the car now, but they require adapters. The front is a 245/40/18. Back is 285/35/19

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Old 02-12-2018, 03:30 PM
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Originally Posted by Pwnage1337 View Post
Haven't ran that big of a tire on the back yet, just stealing the offset from the ZR1 wheel that apparently just bolts right on to the early C4s.

I have C6 oem wheels on the car now, but they require adapters. The front is a 245/40/18. Back is 285/35/19

If you like the tire placement as it is now then use the offsets of those wheels + the thickness of the adapters for the calculations. On the rear I'd put my hands on a 11" @36 from a ZR-1 and do a test fit!! You're going to be the guy who's committed for the $$$ once they're built.

I think an [email protected] would require the rear be spaced equally on both sides. All C4's ain't that way!!
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Old 02-12-2018, 09:26 PM
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Thanks for the help, the wheels on there right now fit pretty good, although not as wide as I'd like lol
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Old 02-15-2018, 01:07 AM
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I've always found this calculator helpful in visualizing current vs future offset/size/diameter changes.

https://www.rimsntires.com/specspro.jsp
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Old 02-15-2018, 09:18 PM
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Originally Posted by GREGGPENN View Post
I've always found this calculator helpful in visualizing current vs future offset/size/diameter changes.

https://www.rimsntires.com/specspro.jsp
Says I can't reach the website!

I'll give it a shot later. Maybe their server is down.


Thanks everyone so far for their input


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