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Old 04-25-2013, 04:04 PM   #1
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17x11

Will this size wheel fit on my 04 gt and what backspacing will I need?
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Old 04-26-2013, 03:39 PM   #2
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Anyone please
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Old 04-26-2013, 03:43 PM   #3
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A +13 offset for an 11'
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Old 04-26-2013, 04:31 PM   #4
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Is that what I need and what back spacing? I want it flush with fender? What is the stock offset?
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Old 04-26-2013, 04:50 PM   #5
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I'm not sure on those numbers
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Old 04-26-2013, 05:05 PM   #6
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Ah alright this is so hard to figure out cause I don't want to screw up an order!!
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Old 04-26-2013, 05:06 PM   #7
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So you're going to go with an 11'? We're do you plan on ordering the wheels from
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Old 04-26-2013, 05:08 PM   #8
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Summit racing and yeah a 17x11 but I want to know the back spacing I need they have a 17x11 with a 7.25 bs and a 4.5 or something like that!!
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Old 04-26-2013, 05:10 PM   #9
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Contact them and ask them
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Old 04-26-2013, 05:37 PM   #10
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I think that's what I'm gunna do!!
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Old 04-26-2013, 07:52 PM   #11
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Definitely going to need a 7.5 back spacing at the minimum for that size wheel. Backspacing is the measurement from the spoke of the wheel to the back of the wheel. Higher bckspacings push wheels into the fender, whereas lower backspacing push the wheels out. Here's a photo of my car with 15x10s with 5.5bs for reference.
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Old 04-26-2013, 09:10 PM   #12
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Well I want them flush with the wheel well so would a 6.5 back spacing work and what size back spacing for the fronts 17x9.5 what bs?
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Old 04-26-2013, 09:55 PM   #13
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Honestly I'm not sure. I think a 6.5bs would put that 17x11 outside the fender a lot like mine. Best way to find out is to find pictures of new edges with the same setup. I'd try SVT Performance. They have a ton of wheel and tire threads. Keep in mind that you're lowered as well.
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Old 04-27-2013, 04:51 PM   #14
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I found a terminator cobra with a sra axel and the 17x11 with a 6.75 bs so is that what I would need or are the cobras fenders deeper that the gt's?
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Old 04-29-2013, 10:28 PM   #15
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I don't know much about that Cobra, but the Cobra has IRS. So it may require a different BS.
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Old 04-29-2013, 11:56 PM   #16
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Yeah I'm gunna just have to call and hopefully they can give me good info!!
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Old 04-30-2013, 12:04 AM   #17
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Cobra IRS on mine with 18x10s in the back not sure on bs but their bullit replicas 305 nitto drag no rubbing
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Old 04-30-2013, 11:24 AM   #18
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the Cobra IRS is a bit different than the solid rear axle but not sure exactly how much (overall not a ton but a little can matter)

The following assumes IRS rear end fitment:

with all that said the maximum you can push out from the rotor surface (mounting surface) is 3.75-4 inches and you will need to roll the fender for that, 3.50 is usually safe~ you MIGHT be ok at 3.75 but its a guessing game.

That means 11 - 4 = 7 inches

so you want 7 inches back spacing 4 inches front spacing (MAX and this may push the tire outside the fender edge a bit depending on how fat the tire is this is RIM flush to the fender lip)

This would mean the center line is 5.5 inches and the mounting surface is 4 inches inward from the front of the wheel so you have 1.5 inches to make center line, thats your offset (1.5 inches)

each inch is 25.4mm so 1.5 * 25.4 = 38.1mm offset needed for that

I would however consider 3.75 inches at most that gives a fender flush look since the tire should stick out past the rim a tad bit

11 - 3.75 = 7.25mm

so add another .25mm onto that offset (6.35mm) or 44.45mm offset (this should meet tire flush with the fender lips if tires are not much wider than rim, just enough for rim lip protection)

if you dont want to roll your fenders then... 3.50 will work so add another 6.35mm or (50.8mm offset)

with each reduction in the frontspacing you push the rim farther inward, this may cause issues with hitting stuff and clearing the exhaust and quad shock~ may have to break out the measure and see where you fall and adjust as needed.

EVERYTHING ABOVE IS BASED ON THE COBRA IRS SO FIGURE OUT THE WIDTH DIFFERENCES AND ADJUST AS NEEDED!!!!

you can look at pics in my album for my rear rims they are 18x10 with 6.25 inches back spacing 3.75 inches front spacing (i rub on the drivers side BARLEY)

front are 18x9 with 2.81 front pacing i think

for the front the lower the car the more tucked in the rim sits due to how the suspension works, for IRS its similar FYI so if my car were stock height (2 inches higher) the rims would sit out more, on SRA this is not an issue, another reason to consider 3.50 front spacing (after adjusted for IRS vs SRA differences)
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Old 04-30-2013, 09:47 PM   #19
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So I measured today and the back you can fit a 6.5 to a 7 but the 7 might hit the quad shock so If I get them in a 6.5 bs wont it stick out to far?
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Old 04-30-2013, 10:50 PM   #20
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keep suspension travel in mind too
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