Can anyone tell me if a 20x10 front wheel with a +38 offset will work on my 08 GT500
Thx
Thx
Front wheel offset
- Thread starter blueovalkid
- Start date
It should, but also depends on the tire you intend to mount. Offset on the SVT PP wheels are +44 mm offset and the standard wheel is +45mm offset, so you're looking at ~1/4" closer to the outer fender.
Stock rear '13-14 wheel on the front with a 5/8" spacer has me at flush and safe with 275/35/20 Nittos.
I'll get the exact offset for you on a rear wheel.
-J
I'll get the exact offset for you on a rear wheel.
-J
Stock '13-14
19x9.5 +44
20x9.5 +50
-J
19x9.5 +44
20x9.5 +50
-J
Those specs only apply to the performance pack wheels. The standard GT500 wheels were +45 mm offset front and rear 07-14 for the 18" and 19" wheel diameters.
Believe me, I know "it should" can cost a lot of $$$ when a person is trying to fit wheel tire combinations. Also keep in mind that the center line of a wheel changes with a width change. You specifically asked about a 20X10, here is the 20X10 specific information I have for the Shelby Perf. Parts Alcoa's and the "knock-off" BMC Alcoa's.
Information copied and pasted from the Shelby Perf. Parts and BMC websites.....
^^^^^From that list above and the offsets shown................I moved my original rear 20X10 Alcoa's to the front, so what you see below is a 20X10 Alcoa with a 36.7 offset on the front of a 2008 GT500. If you go with more + offset, the wheel will stick out further. Mine are right at the edge of the front fender and I am aligned with my front end still within Ford alignment specs.
Also a side note on the BMC "knock-off" aftermarket Alcoa's shown on my chart, I have seen the mounted on our cars and with their more positive offset, they do stick out more.
>>>>And a last mention......Make sure the 20X10's you choose, fit/clear your front brakes. If you have a big brake kit up front, some wheel changes don't fit without spacers which add additional outward spacing.
R
Information copied and pasted from the Shelby Perf. Parts and BMC websites.....
^^^^^From that list above and the offsets shown................I moved my original rear 20X10 Alcoa's to the front, so what you see below is a 20X10 Alcoa with a 36.7 offset on the front of a 2008 GT500. If you go with more + offset, the wheel will stick out further. Mine are right at the edge of the front fender and I am aligned with my front end still within Ford alignment specs.
Also a side note on the BMC "knock-off" aftermarket Alcoa's shown on my chart, I have seen the mounted on our cars and with their more positive offset, they do stick out more.
>>>>And a last mention......Make sure the 20X10's you choose, fit/clear your front brakes. If you have a big brake kit up front, some wheel changes don't fit without spacers which add additional outward spacing.
R
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Actually, more positive offset pushes the wheel/tire combination further inboard which could cause interference with spring pad on the strut. Less offset pushes the wheel/tire combination outward and if shallow enough could push the combo outside the fender well
Yes, I guess I was thinking the other way around. Thanks
By the OP's measurement +38, by the time a tire is mounted, could be against the strut. I can't get my index finger between the strut and the tire buldge on my 20X10/275 tire set-up.
One thing I can say, the BMC Alcoa's stick out a little more than the original SPP Alcoa's and their offset numbers are a little more + by their website posted numbers, that is all I know from seeing them mounted.
R
By the OP's measurement +38, by the time a tire is mounted, could be against the strut. I can't get my index finger between the strut and the tire buldge on my 20X10/275 tire set-up.
One thing I can say, the BMC Alcoa's stick out a little more than the original SPP Alcoa's and their offset numbers are a little more + by their website posted numbers, that is all I know from seeing them mounted.
R
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Here is another 10" Front 12" Rear tire wheel combo that I saved to my picture archive..........
In the pictures above the owner installed 285 Fronts and 315 Rears in the R888 tires. He said he had no rubbing anywhere, even turned lock to lock. I do not know the offset of these front 10", but it appears he is tilted in at the top a little more than me.
^^^^That tire/wheel combination gives a "Man Car" look to that 5.0.
R
In the pictures above the owner installed 285 Fronts and 315 Rears in the R888 tires. He said he had no rubbing anywhere, even turned lock to lock. I do not know the offset of these front 10", but it appears he is tilted in at the top a little more than me.
^^^^That tire/wheel combination gives a "Man Car" look to that 5.0.
R
^^^That fills out nicely, I have always liked the SVTPP wheels. How wide is the rim, 9.5"?
It is amazing that a 285 (rear tire size) can be so nicely fitted to the front of these heavy nosed GT500's, it helps the front grip when pressed in a turn for sure.
While most were worried about rear tire width and grip, there was the other end that also needed help with grip.
R
'13-14 wheels are all the same specs, same offset, only difference in design and finish.
-J
Tire specs at 28" diameter. I don't think you could put anything taller on the front. You might could get away with a 305 width in a shorter diameter, but offset would be pretty critical for fitment. I'm not sure what that might be.
So after I was corrected on + and - offset (and I need to remember that because I have been corrected before), the OP question as to if +38 offset 20X10 will fit on the front of a 2008 GT500, the answer is yes depending upon tire choice and it possibly could require a thin spacer, maybe 1/8" (3.175mm) since the rim will move inward in comparison to my +36.7 shown post #6. If they make 1/16" spacers, that would be closer to mine..........and then we are also back to possible brake caliper interference depending upon wheel choice.
R
R
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I agree, I think I am at 27.7" with the 275 front. Maybe something like a 295 Nitto Invo could be fitted to the front, but they run small, so then it only becomes a number and not real tread width addition.
R
Tire will be a 275/35/20
I run a 10 x 20 with a +48 mm offset with Michelin PSS 285/35/20 tires. My tires are inside of the fender lip with plenty of room to spare. Moving outwards by 10mm shouldn't cause any issues.
How do you like the 285 up front? What are the rears? I've been considering moving to a 285 on the front as well.
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I was running a 315/35-20 in the rear on widened SVTPP wheels. I've since mounted 325/30-20s, and the 285 are a little taller. I've also since acquired a set of True Forged wheels in 20", so I will mount the 275/35-20 that came mounted on them. It's a closer fit to the new rear rubber in terms of outer diameter. A 285/35-20 specs at a taller diameter, but has the same rev per mile data, so the loaded radius works out to be the same. I'll probably end up there at some point.
But to answer your question, the 285s were great. The taller sidewall made for a comfortable ride and I didn't have any rubbing issues. Anything much shorter would have looked out of place with the 28.8" rear diameter. My front end wasn't lowered much, however. I don't track the car, so they were never pushed to the limits of adhesion.
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