Wheel Offset Question
Thread Starter
Burning Brakes
Joined: Apr 2008
Posts: 1,190
Likes: 68
From: Woodland Hills California
Wheel Offset Question
I have a 2008 C6 Z51 coupe with GS widebody mod and z06 brakes front and rear. I used custom three-piece wheels, but kept the stock z06 widths and offsets. I am now considering increasing the outside lip by 1/2" on the fronts and rears. I would do this by replacing the outside lip with one that is 1/2" wider, trimming 1/4" off the center piece where it mates to the hub, and leaving the inside lip as is. This will push the inside lip toward the center of the car 1/4" (approx. 6.5mm) and push the outside lip away from the center of the car 1/4" (approx. 6.5mm). It looks like the wheel and tire will still sit inside the edge of the fenders. Not sure about inside clearance.
I will use Nitto 285 front and 335 rear, which I am running now on the z06 spec'd custom rims.
Does anyone have insight to this mod I am considering?
John
I will use Nitto 285 front and 335 rear, which I am running now on the z06 spec'd custom rims.
Does anyone have insight to this mod I am considering?
John
Race Director
Joined: Mar 2005
Posts: 11,549
Likes: 27
From: Southampton NJ
I have a 2008 C6 Z51 coupe with GS widebody mod and z06 brakes front and rear. I used custom three-piece wheels, but kept the stock z06 widths and offsets. I am now considering increasing the outside lip by 1/2" on the fronts and rears. I would do this by replacing the outside lip with one that is 1/2" wider, trimming 1/4" off the center piece where it mates to the hub, and leaving the inside lip as is. This will push the inside lip toward the center of the car 1/4" (approx. 6.5mm) and push the outside lip away from the center of the car 1/4" (approx. 6.5mm). It looks like the wheel and tire will still sit inside the edge of the fenders. Not sure about inside clearance.
I will use Nitto 285 front and 335 rear, which I am running now on the z06 spec'd custom rims.
Does anyone have insight to this mod I am considering?
John
I will use Nitto 285 front and 335 rear, which I am running now on the z06 spec'd custom rims.
Does anyone have insight to this mod I am considering?
John
Thread Starter
Burning Brakes
Joined: Apr 2008
Posts: 1,190
Likes: 68
From: Woodland Hills California
Race Director
Joined: Mar 2005
Posts: 11,549
Likes: 27
From: Southampton NJ
how about put a 1/4 inch wheel spacer on and try it, most auto stores or pep boys have them
Thread Starter
Burning Brakes
Joined: Apr 2008
Posts: 1,190
Likes: 68
From: Woodland Hills California
That would tell me what is happening on the outside of the wheel but not on the inside. I am shaving off 1/4" from the center, which will push the wheel in 1/4". This will result in the 1/2" wider outer lip only pushing the wheel a net 1/4" outward. I need to know if the 1/4" movement inward will cause any interference.
Thread Starter
Burning Brakes
Joined: Apr 2008
Posts: 1,190
Likes: 68
From: Woodland Hills California
That would tell me what is happening on the outside of the wheel but not on the inside. I am shaving off 1/4" from the center, which will push the wheel in 1/4". This will result in the 1/2" wider outer lip only pushing the wheel a net 1/4" outward. I need to know if the 1/4" movement inward will cause any interference.
Race Director
Joined: Mar 2005
Posts: 11,549
Likes: 27
From: Southampton NJ
That would tell me what is happening on the outside of the wheel but not on the inside. I am shaving off 1/4" from the center, which will push the wheel in 1/4". This will result in the 1/2" wider outer lip only pushing the wheel a net 1/4" outward. I need to know if the 1/4" movement inward will cause any interference.
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Melting Slicks
Joined: Sep 2008
Posts: 2,360
Likes: 59
From: San Jose California
Remove the rear spring and the shock, then you can move the wheel you have through the full range of motion. Then measure what room you have to see if the extra 1/4" will be an issue.
DJ
DJ
Drifting
Joined: Nov 2005
Posts: 1,745
Likes: 35
From: Turlock CA
What width wheel and offset do you have now? All you're doing is putting a half inch wider wheel on the car with the same offset that you have now. Also, what tire size will you run?
Are you sure the lug nuts will have enough thickness in the hub after you take 1/4 inch off of it?
--Dan
Are you sure the lug nuts will have enough thickness in the hub after you take 1/4 inch off of it?
--Dan
Thread Starter
Burning Brakes
Joined: Apr 2008
Posts: 1,190
Likes: 68
From: Woodland Hills California
What width wheel and offset do you have now? All you're doing is putting a half inch wider wheel on the car with the same offset that you have now. Also, what tire size will you run?
Are you sure the lug nuts will have enough thickness in the hub after you take 1/4 inch off of it?
--Dan
Are you sure the lug nuts will have enough thickness in the hub after you take 1/4 inch off of it?
--Dan
My concern is interference of the inside lip, because it will move 1/4" closer to things adjacent to the wheels.
Drifting
Joined: Nov 2005
Posts: 1,745
Likes: 35
From: Turlock CA
The wheels are stock z06 width and offset. Since I am adding 1/2" on the outer lip and trimming 1/4" from the center, the effect is that the wheel will sit 1/4" more in and the outer lip will stick out 1/4" more than the current setup. I will run stock tire size on front and 345/30r19 on rear. 1/4" will leave the minimum thickness for safe operation.
My concern is interference of the inside lip, because it will move 1/4" closer to things adjacent to the wheels.
My concern is interference of the inside lip, because it will move 1/4" closer to things adjacent to the wheels.
--Dan
Thread Starter
Burning Brakes
Joined: Apr 2008
Posts: 1,190
Likes: 68
From: Woodland Hills California
Rear: 19 x 12, +59mm offset
Drifting
Joined: Nov 2005
Posts: 1,745
Likes: 35
From: Turlock CA
You'll have no issues with clearance when adding a 1/2" wider wheel with the same offset. Your current backspacing in front is 6.82". The new wheel will be 7.07".
On my front street wheels I run a 7.94" backspacing and 8.03" with race wheels. Both will touch slightly at full lock but that's with 295 and 305 tires respectively. You'll have lots of room.
On the rear, you now have 8.82" backspacing. New will be 9.32". I run a 9.36" backspacing on my race wheels with a 335 tire and no issues.
As was suggested, stick a lump of putty or gum on your wheel and tire and the extreme edges and give it a turn or a slow drive.
Personally, I don't think you'd have any problem just adding the 1/2" to the outside without cutting the hub down. That would certainly relieve any concern you have for clearance to the inside and save money. Again, stick some putty on it and take a drive. At worst, you can add some camber to tuck the top of the tire in. I can't tell you from actual experience on the outside measurements as I have a base model, but ... your fenders are out an extra 1.5", so ...
--Dan
On my front street wheels I run a 7.94" backspacing and 8.03" with race wheels. Both will touch slightly at full lock but that's with 295 and 305 tires respectively. You'll have lots of room.
On the rear, you now have 8.82" backspacing. New will be 9.32". I run a 9.36" backspacing on my race wheels with a 335 tire and no issues.
As was suggested, stick a lump of putty or gum on your wheel and tire and the extreme edges and give it a turn or a slow drive.
Personally, I don't think you'd have any problem just adding the 1/2" to the outside without cutting the hub down. That would certainly relieve any concern you have for clearance to the inside and save money. Again, stick some putty on it and take a drive. At worst, you can add some camber to tuck the top of the tire in. I can't tell you from actual experience on the outside measurements as I have a base model, but ... your fenders are out an extra 1.5", so ...
--Dan