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Old 10-23-2015, 02:49 PM   #1
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More rubber - original Wheels

I am thinking of increasing the outside diameter of my rear tires, by installing beefier tires on the original wheels.

I think of maybe using 55 series tires. Did anyone try this before ? any suggestion on the dimensions that would fit ?

Otherwise, I may get wider rear wheels and do the same.
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Old 10-23-2015, 02:55 PM   #2
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Food for thought you will need to tune it other wise it will throw off abs, traction control, speedo etc.


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Old 10-23-2015, 04:30 PM   #3
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Quote:
Originally Posted by UP North View Post
I am thinking of increasing the outside diameter of my rear tires, by installing beefier tires on the original wheels.

I think of maybe using 55 series tires. Did anyone try this before ? any suggestion on the dimensions that would fit ?

Otherwise, I may get wider rear wheels and do the same.
What's the size of your stock wheels?
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Originally Posted by parkerz28 View Post
Food for thought you will need to tune it other wise it will throw off abs, traction control, speedo etc.
Wrong.
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Old 10-23-2015, 04:48 PM   #4
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The only thing that generally throws an ABS error is if you run tires that have a really BIG difference in diameter.

The rule of thumb is to keep the differences in sizes 3% or less.

3% of stock tires = about 7/8" difference... and you'd still be ok.
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Old 10-23-2015, 04:59 PM   #5
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The only thing that generally throws an ABS error is if you run tires that have a really BIG difference in diameter.

The rule of thumb is to keep the differences in sizes 3% or less.

3% of stock tires = about 7/8" difference... and you'd still be ok.
Yea no that's not true. I ran a 25.5" front tire and a 28" rear tire and my ABS light never came on.
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Old 10-23-2015, 05:32 PM   #6
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Quote:
Originally Posted by UP North View Post
I am thinking of increasing the outside diameter of my rear tires, by installing beefier tires on the original wheels.

I think of maybe using 55 series tires. Did anyone try this before ? any suggestion on the dimensions that would fit ?

Otherwise, I may get wider rear wheels and do the same.
What you're saying could be a bit confusing.
You refer to larger diameter tires by installing beefier tires. ?? Assuming beefier you mean wider, that doesn't typically mean larger dia tires.
Assuming you want to retain the same dia tires, so you don't impact your speedometer, you would increase the aspect ratio and tire width combination that will give you close to the same diameter.
Do you currently have the 235/50-18(8" wide rim)
If so, a close match would be 255/45-18 (I think that will fit on an 8" wide rim.)
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Old 10-24-2015, 03:11 PM   #7
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I am assuming that you have 18X8 rims. This is what I went with on my 2011 GT and am very happy with the wet performance as well as dry street . Your not going to be making any meaningful difference by going up any larger with the stock 18X8" rims

http://www.tirerack.com/tires/tires....omCompare1=yes
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Old 10-25-2015, 03:55 AM   #8
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I like the Old School look so I'm running 255x50x17 on the rear & 215x55x17 on the Fronts with no problem. These are on Stock Bullitt Style wheels (17x8) rims. My cars an 08 though.
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Old 10-25-2015, 09:51 PM   #9
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Just put 265/45/18 on my 18x8's looks good no bulges

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Old 10-26-2015, 10:40 AM   #10
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Originally Posted by Grabber Blue5.0 View Post
Yea no that's not true. I ran a 25.5" front tire and a 28" rear tire and my ABS light never came on.
Well, I guess that's why Ford's traction control system sucks (not sensitive enough or doesn't "control" front to rear problems), compared to most other sports car brands. B/c I KNOW in a Vette or a Porsche, that much of a change would throw an error.
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Old 10-26-2015, 11:43 PM   #11
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Well, I guess that's why Ford's traction control system sucks (not sensitive enough or doesn't "control" front to rear problems), compared to most other sports car brands. B/c I KNOW in a Vette or a Porsche, that much of a change would throw an error.
Thats true, if you have two different wheel speeds it should affect the ABS, and traction control during hard braking. But it probably wont throw codes.
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Old 10-27-2015, 07:33 AM   #12
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Thats true, if you have two different wheel speeds it should affect the ABS, and traction control during hard braking. But it probably wont throw codes.
It should affect acceleration & traction control too (not just braking), as if tires are spinning faster than expected it means you're getting wheel spin or slipping on snow, ice, etc.
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Old 10-30-2015, 09:33 PM   #13
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Many thanks for the advice & comments.

Yes, I was thinking of increasing rear wheel tire OD. Will not, or less than 3%, even if I fully agree that my traction control and ABS are very aproximative !!!

I do have the original 2012 GT wheels.
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Old 11-01-2015, 02:03 PM   #14
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there are lots of online tire measurement website where you could enter your OEM size and compare to the size you want to switch in. There usually are plenty of data you can analyze on.
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