wheel offset questions
Thread Starter
Safety Car
Joined: Dec 2009
Posts: 4,754
Likes: 303
wheel offset questions
I'm looking at a set of OZ wheels and am trying to calculate the offsets and how they'll work w/ my base C6.
The fact that they stick out an additional 17mm has me a bit worried, but it's no where near as big as the jump to the Z06 size wheels.
Anyways, will the OZ wheels fit my car well?
base
18x8.5 +56mm
19x10 +79mm
base widened... aka spinmonster modded
18x8.5 +56mm (same)
19x11 +88mm (22mm less inner space / 4mm extend outer)
OZ
19x8.5 +59mm (3mm less inner space / 3mm retract outer)
20x11 +75mm (9mm less inner space / 17mm extend outer)
z06
18x9.5 +40mm (3mm more inner space / 29mm extend outer)
19x12 +59mm (5mm less inner space / 45mm extend outer)
The fact that they stick out an additional 17mm has me a bit worried, but it's no where near as big as the jump to the Z06 size wheels.
Anyways, will the OZ wheels fit my car well?
base
18x8.5 +56mm
19x10 +79mm
base widened... aka spinmonster modded
18x8.5 +56mm (same)
19x11 +88mm (22mm less inner space / 4mm extend outer)
OZ
19x8.5 +59mm (3mm less inner space / 3mm retract outer)
20x11 +75mm (9mm less inner space / 17mm extend outer)
z06
18x9.5 +40mm (3mm more inner space / 29mm extend outer)
19x12 +59mm (5mm less inner space / 45mm extend outer)
Drifting
Joined: Oct 2006
Posts: 1,569
Likes: 4
From: Phoenix AZ
St. Jude Donor '09-'10-'11
Ask the experts
Once you choose the manufacturer of the wheels you want, tell them whatcha got and whatcha want along with tire sizes planned, and let their engineers figure it out. No muss, no fuss. 
Race Director
Joined: Mar 2005
Posts: 10,399
Likes: 25
From: Austin Texas
Thread Starter
Safety Car
Joined: Dec 2009
Posts: 4,754
Likes: 303
Also, the wheels are stated to fit the base C6, I was just curious about that extra 17mm of 'poke' on the rear vs. stock. Would that be an issue? Anyone running similar sized wheels?
Racer
Joined: Apr 2006
Posts: 364
Likes: 0
From: Setauket New York
What size tires do you plan on running with the 20x11's? And is your car lowered at all? With 305's I think you will be ok, but anything wider and it may rub. Heres a pic of my setup.
Thread Starter
Safety Car
Joined: Dec 2009
Posts: 4,754
Likes: 303
I am running a 19x10 with a 65mm offset which sticks out 14mm more than stock. These just fit inside the fenders without rubbing on my lowered c6 with 295/35/19 tires.
What size tires do you plan on running with the 20x11's? And is your car lowered at all? With 305's I think you will be ok, but anything wider and it may rub. Heres a pic of my setup.
What size tires do you plan on running with the 20x11's? And is your car lowered at all? With 305's I think you will be ok, but anything wider and it may rub. Heres a pic of my setup.
Awesome, that's the kind of input and pics I was looking for. I'm lowered on cut stock bolts in the rear, so there's still about a finger+ gap back there.
I'm worried about the rear being exactly flush and the front being spaced in further than stock... I assume it would look ok.
3mm more than your setup would probably be manageable. Do you rub?
Racer
Joined: Apr 2006
Posts: 364
Likes: 0
From: Setauket New York
Awesome, that's the kind of input and pics I was looking for. I'm lowered on cut stock bolts in the rear, so there's still about a finger+ gap back there.
I'm worried about the rear being exactly flush and the front being spaced in further than stock... I assume it would look ok.
3mm more than your setup would probably be manageable. Do you rub?
I'm worried about the rear being exactly flush and the front being spaced in further than stock... I assume it would look ok.
3mm more than your setup would probably be manageable. Do you rub?
Thread Starter
Safety Car
Joined: Dec 2009
Posts: 4,754
Likes: 303
It looks like the only size that fits with a matching diameter to stock is the 285/30-20
That seems small... but I tried some 295 and 305 combos w/ a 20 and nothing worked.
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Race Director
Joined: May 2007
Posts: 10,805
Likes: 706
From: Feverish All Over
Here are my stats:
ACE alloy "Slick" wheels
Fronts - 18 x 9.5 +53 mm offset with BFG KDW 275/35 tire
Rears - 19 x 11 +73 mm offset with BFG 295/35 tire
This set up gets the tire right out to the fender edge with nu rubbing of any kind, and my car is lowered a tab on the Hardbar Delrin lowering bolts. Sorry I don't have a pic right now, but the look is perfect.
Other bonus is that the ACE wheel clears the Z06 big brakes which I have on my base C6.
ACE alloy "Slick" wheels
Fronts - 18 x 9.5 +53 mm offset with BFG KDW 275/35 tire
Rears - 19 x 11 +73 mm offset with BFG 295/35 tire
This set up gets the tire right out to the fender edge with nu rubbing of any kind, and my car is lowered a tab on the Hardbar Delrin lowering bolts. Sorry I don't have a pic right now, but the look is perfect.
Other bonus is that the ACE wheel clears the Z06 big brakes which I have on my base C6.
Race Director
Joined: May 2007
Posts: 10,805
Likes: 706
From: Feverish All Over
http://forums.corvetteforum.com/c6-p...ighlight=slick
The guy in this thread is selling the same wheels I have on my car....
Have a look.....
The guy in this thread is selling the same wheels I have on my car....
Have a look.....
Thread Starter
Safety Car
Joined: Dec 2009
Posts: 4,754
Likes: 303
Nice... it looks like a 285 would work for sure since it would have a minor stretch on the 11" wheel.
Now a little twist.. I'm looking at an 18"x11" wheel with the same offset from OZ to run drag radials on.
Would a 305/35-18 MT ET Street II drag radial fit an an 11" wide wheel w/ a 75mm offset?
I'd imagine it measures a bit wider than the '305' it advertises.
Now a little twist.. I'm looking at an 18"x11" wheel with the same offset from OZ to run drag radials on.
Would a 305/35-18 MT ET Street II drag radial fit an an 11" wide wheel w/ a 75mm offset?
I'd imagine it measures a bit wider than the '305' it advertises.
Thread Starter
Safety Car
Joined: Dec 2009
Posts: 4,754
Likes: 303
Jegs lists the MT 305/35-18 as being 27'' x 12.5'' - 18''
if it actually measures 12.5" wide, that would be 317.5mm wide
I think that might be too much for the 11" wide +75mm offset wheel to handle...
if it actually measures 12.5" wide, that would be 317.5mm wide
I think that might be too much for the 11" wide +75mm offset wheel to handle...
Le Mans Master
Joined: Jun 2004
Posts: 6,269
Likes: 50
From: Dallas Texas
St. Jude Donor '06-'07-'09-'10
I've read posts here where guys are running 11 X 19 CCW's with 79 mm offset and 325 Z06 tires on their C6's with no problems. With the 79mm offset, the extra 1" is equally divided inside and out. I'm seriously considering going this route.
Le Mans Master
Joined: Nov 2007
Posts: 6,412
Likes: 198
From: Wilkes-Barre Pa
The Vossen wheels currently on my car are 20x11 in the rear with a +75 offset. 305/30/20s will be flush with the fender and fit well. I have Toyo R888s on that are 315s and they stick out a hair.
Team Owner
Joined: Nov 2006
Posts: 21,136
Likes: 212
From: Long Island New York
Thats what I did. 325/275's. Couldnt be happier.
Drifting
Joined: Feb 2006
Posts: 1,339
Likes: 1
From: Lake Delton (WI Dells) WI
http://forums.corvetteforum.com/c6-p...ighlight=slick
The guy in this thread is selling the same wheels I have on my car....
Have a look.....
The guy in this thread is selling the same wheels I have on my car....
Have a look.....
My CCW SP500 Wheels with Michelin PS2 Tires (18x10F and 19x11R with 265/35/18F and 305/30/19R tires) weigh in at 47.5lbs ea front and 53lbs ea rear.
Drifting
Joined: Feb 2006
Posts: 1,339
Likes: 1
From: Lake Delton (WI Dells) WI
I know I commented on your car before, but I really like that silver/comp gray look! 
I believe I have the same offset wheels you do, but I am running the 305/265 tire combo. Are your wheels 10" front and 11" rear? I am hoping Michelin releases a 325/30 tire that's a non RF when it's time to replace my tires.
I believe I have the same offset wheels you do, but I am running the 305/265 tire combo. Are your wheels 10" front and 11" rear? I am hoping Michelin releases a 325/30 tire that's a non RF when it's time to replace my tires.
Team Owner
Joined: Nov 2006
Posts: 21,136
Likes: 212
From: Long Island New York
Thanks again. The fronts are 9 1/2" because CCW told me I couldnt mount Z06 front brakes on a 10" wheel. The rears are 11". My tires are Bridgestone Pole Position RF's in stock Z06 sizes. IMO they are better than the Goodyears.
Race Director
Joined: May 2007
Posts: 10,805
Likes: 706
From: Feverish All Over
The scale in the pic says 53 lbs and if you look closely it is wheel AND tire - same weight as yours....
Drifting
Joined: Feb 2006
Posts: 1,339
Likes: 1
From: Lake Delton (WI Dells) WI
REAR (?):
FRONT (?):
