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11-15-2007, 11:10 AM
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Ouch Ouch Hot Sand
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Join Date: Jul 2003
Location: Daytona Beach,
FL
Cobra Make, Engine: Street Beasts w/302 Twin Turbocharged....Under Construction!!
Posts: 1,796
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Not Ranked
Okay, maybe I'm crazy, but a Search did not help....Wheel Offset help??
How do I figure what offset to get on my wheels so the tires will be about 1" outside the body lip?? 
Also, should the center line of the front and rear wheels line up??
When my car sits on the lift with the doughnut tires I have on it, for construction only (hee-hee), the front tires sit about 1 to 1 1/2" inside the rear tires................kinda like below 
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__________________
Safe Flyin, errrrr Drivin, Earl
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11-15-2007, 05:47 PM
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Senior Club Cobra Member
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Join Date: Jan 2007
Location: Cochran, near Macon,
GA
Cobra Make, Engine: Street Beasts 302 HO
Posts: 311
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Not Ranked
Earl: Are you planning to do some mud boggin? Why would you want your tires 1" outside the body, other to sling mud and rocks at folks. We do that here in the Swamp, but not in Sunny Florida.
I'll leave the "technical" explination of wheel offset to the experts on CC. Hurry up and get yours done so I can borrow all your notes for my car.
__________________
52chevyred
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11-15-2007, 08:41 PM
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Senior Club Cobra Member
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Join Date: Oct 2004
Location: Roanoke,
Tx
Cobra Make, Engine: 2002 Lone Star Classics LS427, 428 CJ engine stroked to 464, 580hp/590tq at flywheel
Posts: 557
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Not Ranked
I believe the best place to go and get pics ilustrating how to do it is at TireRack. Go to their site and look for tecnincal data - they have tons of it. If not post again and I can explain.
It is like they say - a picture is worth a thousand words!
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11-16-2007, 06:11 AM
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Senior Club Cobra Member
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Join Date: Dec 2001
Location: Shasta Lake,
CA
Cobra Make, Engine:
Posts: 26,615
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Not Ranked
Earl,
I am not sure if all makes are like that but my front tires did not have as wide of a track as the rears. But they were equal on both sides.
Edited to remove an attempt to draw how my wheels ligned up. When I submitted the post, it moved everything to the left. Clois said it best in the folowing post.
Ron 
Last edited by Ron61; 11-16-2007 at 07:30 AM..
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11-16-2007, 07:11 AM
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CC Member
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Join Date: Dec 2000
Location: Broken Arrow. OK ( South Tulsa), USA,
OK
Cobra Make, Engine: 66 COBRA FE 427 /4SP. (HCS Coupe w/ 408 Stroker and TKO 600 -sold)
Posts: 5,595
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Not Ranked
As Ron said, mine are equal on both sides. If I lay a chalk line from the front to the back aligning with the outside edge of my tires on both sides and then I measure between the chalk lines the width of my front and rear tires measure the same. My front wheels are 8" wide with a 4 1/2" back space. My rear wheels are 10" wide with a 3 1/2" back space.
Are you really confused now?
Clois
__________________
Sunshine, Asphalt and no stop signs...Perfect
"Let's roll"
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from CD "Long Road Out of Eden"
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11-16-2007, 08:20 AM
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6th Generation Texan
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Join Date: Feb 2002
Location: Devil's Backbone,RR 32,
TX
Cobra Make, Engine: Lone Star Classics #240,Candy Apple Red,Keith Craft 418w - 602 HP,584 TQ
Posts: 8,157
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Not Ranked
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11-16-2007, 09:36 AM
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Ouch Ouch Hot Sand
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Join Date: Jul 2003
Location: Daytona Beach,
FL
Cobra Make, Engine: Street Beasts w/302 Twin Turbocharged....Under Construction!!
Posts: 1,796
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Not Ranked
It's all clear as MUD..............okay, perhaps I didn't splain it right...I don't want my tires tread hangin out but rather the sidewall, which should put the tread about even with the side of the car..and, yes, I see my picture got moved to the left side toooooooooooooooooooooo
__________________
Safe Flyin, errrrr Drivin, Earl
Last edited by EarlsflyinCobra; 11-16-2007 at 11:31 AM..
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11-16-2007, 10:44 AM
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Senior Club Cobra Member
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Join Date: Dec 2001
Location: Shasta Lake,
CA
Cobra Make, Engine:
Posts: 26,615
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Not Ranked
Earl,
If you have the size tires you want to use and want to figure the off set, why not try what one guy here did. He bought some cheap spacers of varying thicknesses and put them on until he got his tires like he wanted them and then went to the tire and wheel place and had them make his wheel offset the thickness of the spacers. He took the wheel he used to do the measuring so they could see what he wanted.
Ron |
11-16-2007, 03:14 PM
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CC Member
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Join Date: Feb 2005
Location: Truckee and Kailua,
Ca
Cobra Make, Engine: B&B 351/402 Fi roller everything
Posts: 527
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Not Ranked
there is a tool for this !Wheelrite wheel and tire simulator from Percy's High Performance. Cost : about $100. www.percyshp.com
__________________
the older i get the faster i was.
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11-16-2007, 05:20 PM
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Senior Club Cobra Member
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Join Date: Sep 2000
Location: Holderness, NH, US of A,
NH
Cobra Make, Engine: CSX 4772 old iron FE
Posts: 5,499
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Not Ranked
There's a cute little calculator and a lot of maths help on it. You could check here http://www.1010tires.com/WheelOffsetCalculator.asp and put in the numbers off the wheels you have. The easiest way to visualise it is to beg borrow or steal a wheel and tire that is close and bolt it on. Take your numbers from there! |
11-16-2007, 08:13 PM
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CC Member
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Join Date: Mar 2006
Location: San Marcos california,
CA
Cobra Make, Engine: 1989 KCC from South Africa Right Hand Drive
Posts: 1,605
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Not Ranked
I swear these guys should pay me a commission.Check this little tool out!!
http://store.summitracing.com/partde...5&autoview=sku |
11-16-2007, 09:20 PM
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CC Member
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Join Date: Nov 2001
Location: WPB,
FL
Cobra Make, Engine: CMC, Supercharged Ford 5.0 & all the toys.
Posts: 511
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Not Ranked
One thing you'll need here is how the tire fits on rims of different widths, and you can get that from tire manufacturers. I believe companies like BFG actually publish that info in their catalogs. Pick a tire size, pick a rim width to fit (from the tire manufacturer's recommended rim-width range), then you can do all the offset calcs. An easy-ish way would be to measure the width of the car from the left wheel well lip to the right wheel well lip, divide by 2, add whatever excess you want for the tire to stick out, subtract half the outer tire width (as it would be when mounted on the rim), then subtract half the hub-to-hub distance of the rear end. That should be your offset. Batteries not included, has been shown to cause cancer in laboratory rats, do not take with MAOI inhibitors, may cause drowsiness, and all other disclaimers apply
Cheers,
-Neil.
__________________
 www.VEIsystems.com
CMC Cobra, Ford 5.0, EFI, Vortech supercharged, T5Z, 8.8 rear, MII front, 4-wheel discs, A/C, stereo.
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