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Bolt pattern is the same. The only issue I can think of is the tabs that stick out on the ss Brembos, but being 20" rims, I have to believe that they will clear with no problems. Do your homework on the tire sizes. Stock camaro tire sizes will rub on the G8 so guys swap out the tires to one that will work. g8board.com and grrrr8.net should have plenty of info for you on what sizes work.
 

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Camaro SS wheels are 8" with +35mm offset front & 9" rear with +40mm offset. In other words, the wheel outer edge is further "out" from hub mating face, compared to SS sedan wheels.

They fit, but tire size choice and ride height will dictate whether they rub--typically on rear wheel opening of body. Rolling fender lip usually resolves things.

Camaro SS 20's actually use larger OE (taller) tires than SS.

SS sedan: 26.7"/26.6" diameter
F 245/40-19 - load rating 98 (1653 lbs)
R 275/35-19 - load rating 100 (1764 lbs)

Camaro SS: 28.7" diameter
F 245/45-20
R 275/40-20

Option1
Closest match by tire diameter for 20" on SS would be:
F 245/35-20 - 26.8", load rating 95 (1521 lbs)
R 275/30-20 - 26.5", load rating 97 (1609 lbs)
Not clear whether ABS would be affected by greater diameter mismatch

Option 2
Best match by load rating:
F 245/40-20 - load rating 99 (1709 lbs) - 27.7"
R 275/35-20 - load rating 102 (1874 lbs) - 27.6"
Should be no ABS issues with this combination

All specs above taken from Tire Rack listing for Continental Extreme Contact DWS - other brands may vary slightly.

The other thing to be considered is going to 20" with lower aspect ratio - affects ride, typically negatively, and shorter sidewall offers less rim protection in the event of an impact situation (pothole, etc).

The question is whether the 20" wheel and larger tire diameter (Option 2) would look OK, as it will make the car sit 1/2" higher unless the car is lowered at the same time--and that puts the tires in closer proximity to wheel openings, making rub a greater possibility.

The choice comes down to whether anyone considering this really cares about load rating or ride quality.
 

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Discussion Starter · #4 · (Edited)
Wow thanks for the outstanding response I think I would get new tires to match the original tire height. From what I have seen these look great on the G8 and you can find the wheels used for a song now the tires that another thing. It will only be a short time before someone here makes the change so we can see them on the car and the best thing is you don't even have to change out the chevy center cap.

Thanks Again.
 

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FWIW, I have a set of OE Camaro 20's--not the "original" design, but the optional version that came along for 2013. They are essentially new take-offs, purchased from SLP, in Midnight Silver, which is darker than the wheels shown below. PM me if you want more info--they are available--wheels only, no tires or TPMS, center caps included.

Couple of listings for you to see what these look like:

2013 Camaro RS SS 20" Staggered Factory Wheels Pirelli Tires 245 45 20 275 40 20 | eBay

2013 Set of 4 Genuine GM Original Factory Camaro 2SS 20 inch Wheels RS SS | eBay

Here's a thread on New Caprice Forum that shows the 2013 Camaro wheels on a Caprice PPV, in Midnight Silver. As far as the body lines of the SS sedan, I actually think this version is a better fit than the original Camaro SS wheels.

And one more--with pictures--further inside the same thread referenced above.
 

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If anyone knows the weight of the SS (sedan) wheels, that will help. CP probably would know in general terms what the SS wheel or it's close cousin wheels (19x8) weigh.

Camaro SS wheels are not light--32-34 lbs each--cast, not forged.

Here's a picture of one of the 2013 SS/RS wheels I have. This is the Midnight Silver finish.
 

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anyone think Vette rims would fit?
Not without some work.....close, almost "RCH" close. (if you have to ask, google it) :D

Corvette is 4.75" (120.65mm) bolt circle (BC). The problem is the beefy 14mm studs will not bend readily to conform to the Corvette wheel BC, and that will put load on the hub flange, may distort it and cause wheel/rotor runout (wobble), and the tapered seats in the wheels would be heavily loaded on the inner side (radially) and inadequately loaded on the outer side--trying to torque the studs to 140 lb/ft would be an exercise in "what's gonna break first", among other potential issues.

If that explanation is confusing, let me try this--you could actually slip a Corvette wheel on to the SS. The studs on SS are larger, so that's the first potential problem. Since the BC of the SS is smaller, as the lug nuts are tightened, the tapered lug will come into contact with the inner side of the Corvette whee first, because the stud is not centered on the machined center(s) of the Corvette wheel. The uneven load on the tapered seat surfaces creates the problems mentioned above.

There are shops that can deal with this - Motorsport Tech is a wheel adapter manufacturer that comes to mind. They can offset bore the existing wheel seats and install steel tapered inserts on any 4.75 BC alloy wheel to make them good for 120mm applications. I used them back when I was putting Camaro SS wheels on my 96 Impala SS (5x5 to 5 x 4.75) in the late 90's & early 2K. They used to be in SoCal, but have now relocated to Sparks NV - smart move!

On FB, too https://www.facebook.com/MotorsportTech

Taking this one step further, when (you) say "Corvette rims" (wheels, technically), the reality is that through 60 years and, now, seven generations, the Corvette has used the same BC - 4.75", so you need to be specific about the wheels you have in mind--what model year?

FWIW, here are the C7 wheel sizes and offsets (NOT verified independently):

Front wheel specs - 18x8.5 (standard) or 19x8.5 (Z51) with 56mm offset
Rear wheel specs - 19x10 (standard) or 20x10 (Z51) with 79mm offset


It would be essential that anyone trying to fit Corvette wheels to an SS would be using something with "high offset" to mimic stock SS wheels, and to ensure adequate brake caliper clearance--so that will typically include C6 and C7. In the case of the C7, it would be necessary to fit both front & rear with wheels by using adapters. or by use of very long wheel studs, a custom spacer, and wheels modified as described above--when using adapters, they MUST be thick enough for adequate strength as well as to prevent wheel studs from protruding too far beyond the thickness of the adapter. Each adapter supplier has their own minimum specs in this regard.

Many OE Corvette wheels are hollow between wheel stud positions on the back for reduced mass, which leaves room for stud protrusion--this is not always true with aftermarket wheels that would otherwise fit late generation Corvettes. C6 wheel combinations are similar to C7 as far as offsets, and you can find that information easier since the aftermarket has been fitting wheels to C6 since 2005.

The minimum adapter/spacer thickness in the case of the OE C7 wheels, to place the wheels on an SS in "stock" profile (lateral position) would be 8mm for front (8.5 wheel width), which is really not thick enough for proper strength - for the same staggered combination, the rear adapter (10" wheels) would be 22mm thick, which WOULD be enough for adequate strength. As there is at least 10mm of room to push the wheels outward (tire size dependent), a front adapter of 18mm and rear adapter of 32mm would mount C7 wheels on the SS quite nicely, if the offset numbers I've provided are correct.

The alternative--using 8.5" (C7 front) wheels for both front & rear would call for 18mm adapters, or something in the 18-23mm range, I'm thinking--and that still may not work as far as adapter thickness at 18mm. Using 10" wheels F & R is probably NOT an option, even though adapter thickness (for strength) would not be an issue--it would be front clearance to steer the car without rub. While 2014 SS is not listed, Motorsport Tech lists the minimum thickness for an adapter for G8 GXP at 19mm (0.75"). Nothing would change with this minimum for the SS.

The only problem with most Corvette wheel setups today is that not only are they staggered by width, but they are not the same diameter F/R, where the sedan community focuses more on same diameter but different widths. Corvette gets away with it because the ABS system has been calibrated to deal with the F/R diameter differences--not so much with the SS.

The last consideration is that depending on model year, a staggered set with the right dimensions--especially offsets--typically do not offer a F/R set that match in diameter, which is the case with C7, where the front 19" wheel (8.5" wide) is Z51 style (10 spokes, in 5 pairs), and the rear 19" wheel (10" wide) is the standard (5 swept spokes) design.

If it was mine to do, and since a staggered Corvette wheel setup would not be rotated, I think I would modify the front wheels to correct the seat positions on the wheel (to 120mm), and use long studs (through the hub) with specific-thickness machined hub-centric spacers. On the rear, I'd go with an adapter setup (also hub-centric) and leave the wheels alone to do this the "cheap" way--if the car has no spare, this is a non-issue.

With a spare, it would at least cover the 2 rear positions by removing the adapter, but you'd have to wing it with a front wheel/tire issue. The spare wheel could still be installed on front, but driving should only be for a very short distance or to allow the car to be rolled onto a roll-back to get it home or to a tire shop.
 

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adapter configuration

I did a run through Motorsport Tech's online order "configurator", just for grins. Here's an adapter setup for the front, to fit C7 front wheels (SS is not yet in their configuration data base):

Wheel Adapter Configuration - Complete!
*********************
2009 PONTIAC G8_GXP
Your Bolt Pattern: 5x120mm
Your Hub Diameter: 66.9mm
*********************
Type: One Piece Adapter
Hub Centric to Car & Wheel Centric to Wheel
Thickness: 19mm
Stud Size: 14x1.5 (could use 12x1.5 since that is stock C7)
Center Bore: 70.3mm
Diameter: 5 by 120.7 (4.75 inches)
Quantity: 2
*********************
The price for the above configuration (before tax and shipping) is $120.00.
 

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I would NOT run Corvette wheels with your car if you plan on driving it for any length of time. They're fine (personally) for use on the drag strip, but even at the small difference from the VE/VF Commodore (G8 & SS is 5x120mm, Corvette is 5x120.65mm) you can risk losing studs.

That said, SS wheels are forged, and are probably around 10LBS lighter per corner than the Camaro SS 20" wheels (which are not forged).
 
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Will Camaro SS "20's" fit on the 2014 SS
 

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