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Old 04-11-2016, 05:41 PM   #1
giddyup4.6
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Default rear wheel help

Can someone please help me here I'm looking to get 20x10.5 rear wheels that have a +45 offset and 7.5" backspace with 285/30/20 tire wrapping it the front wheels are 20x9 with a +38 offset and 6.5" backspace with 255/35/20 tire wrapping it my car is lowered about 1" maybe a touch more with brake caliper covers my concern is will this setup work with what I have or will I have tire rub issues or sticking out to far on either the front or back any information would be fantastic thanks in advance
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Old 04-12-2016, 11:42 AM   #2
flash_xx
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Wheel brand/model? I have 18x9 in the front and 18x10 in the rear with 255/45 and 285/40 respectively. These are my wheels:

Size: 18x9
Offset: +38mm
Backspacing: 6.49
Lug Pattern: 5x114.3

Size: 18x10
Offset: +42mm
Backspacing: 7.15
Lug Pattern: 5x114.3

Fit is perfect, with no rubbing and no sticking out. Since you're basically only increasing diameter as long as you keep the offset and backspacing the same or close to mine you shouldn't have any problems.

https://lmr.com/item/WK-1007PR/2005-...litt-wheel-kit

You can see it better in this photo:

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Last edited by flash_xx; 04-12-2016 at 05:18 PM.
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Old 04-13-2016, 06:47 AM   #3
Scott2
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I have a wheel and tire configuration similar to your specifications except for the tires. My Vossen CV3-R combination is: Rear 20 x 10.5 7.5" BS +45 Offset with 315/35ZR20 and front 20 x 9 6.2" BS +32 Offset with 245/40ZR20.

You should have no issue in the front. I was concerned about brake clearance with Baer 6P 14" rotors but there is more than adequate clearance with the Vossen wheels.

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There are no issues with the TPMS valve stem sensor clearing the calipers.

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In my opinion the OEM rotors look pretty small with 20" wheels.

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My car is bagged with an Air Lift performance suspension and is shown here aired-out. My differential has been shortened 1" per side and I do not have any issues with the 315's rubbing. I would expect 285's with a 30 sidewall aspect ratio only lowered an inch should be fine.

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Old 04-13-2016, 02:04 PM   #4
flash_xx
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What are those blocks you have the car on?
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Old 04-14-2016, 06:11 AM   #5
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Quote:
Originally Posted by flash_xx View Post
What are those blocks you have the car on?
12" Race Ramps Wheel Cribs, not cheap but very light and strong.
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Old 04-14-2016, 07:51 AM   #6
Norm Peterson
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Quote:
Originally Posted by giddyup4.6 View Post
Can someone please help me here I'm looking to get 20x10.5 rear wheels that have a +45 offset and 7.5" backspace with 285/30/20 tire wrapping it the front wheels are 20x9 with a +38 offset and 6.5" backspace with 255/35/20 tire wrapping it my car is lowered about 1" maybe a touch more with brake caliper covers my concern is will this setup work with what I have or will I have tire rub issues or sticking out to far on either the front or back any information would be fantastic thanks in advance
Your front wheels/tires should sit about the same on the outside as the 255/45-18 GT500 setup (on 9.5" wide +45 offset wheels). And you'll have more strut-side (inside) clearance.


Out back, picture your tire being only a little further "out" (most likely less than 3/8" further) and about half an inch closer to the sheetmetal vertically than this ↓↓↓ . Car in the picture was not lowered. Expect axle centering to come into play here, maybe even if your car is NOT lowered. Your choice of an adjustable PHB or a Watts link.







Norm

Last edited by Norm Peterson; 04-14-2016 at 07:53 AM.
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Old 04-14-2016, 05:29 PM   #7
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Quote:
Originally Posted by Scott2 View Post
12" Race Ramps Wheel Cribs, not cheap but very light and strong.
Thanks, I've been looking for something like these for a while. I have jackstands but I need something to raise the car with the suspension under load. These should work nicely.
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Old 04-14-2016, 06:00 PM   #8
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We have partnered with Kompression Wheels and can build you a custom wheel with any diameter, width, backspace and offset you request. Follow the link below to see the different wheel designs we have available.

http://granatellimotorsports.com/cat...els-558-1.html
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Old 04-15-2016, 08:12 AM   #9
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Try Vorshlag, they seem to have done their homework on getting huge tires under the fenders.
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