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Tire Size

Tiny
GTEUP07
  • MEMBER
  • 2007 FORD MUSTANG
  • 4.6L
  • V8
  • RWD
  • MANUAL
  • 34,000 MILES
I am currently running 245/35/20 front and 295/30/20 rear tires. I want more tire for a softer ride. I put on Steeda Sport lowering springs 1" lower now. Can I run something like 245/40/20 and 275/35/20 front and rear respectfully? I understand the middle number like the 40 and 35 numbers that can provide a softer ride I think. But I do not want the tires so tall that they rub the wheel wells. Please advise.
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Saturday, May 14th, 2016 AT 12:22 AM

7 Replies

Tiny
WRENCHTECH
  • MECHANIC
  • 20,757 POSTS
It would be more like 235/40/20 = 245/35/20 and 285/35/20 = 295/30/20 to maintain original height and circumference.
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Saturday, May 14th, 2016 AT 4:35 AM
Tiny
GTEUP07
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  • 13 POSTS
Do you mean original height and circumference of the 17" or 18" tires that came on it or to match what is on it now?
Thanks
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Saturday, May 14th, 2016 AT 8:37 AM
Tiny
GTEUP07
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  • 13 POSTS
Here is what it looks like with 245/35/20 and 295/30/20.
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Saturday, May 14th, 2016 AT 8:42 AM
Tiny
WRENCHTECH
  • MECHANIC
  • 20,757 POSTS
It matters that the tires have the same original circumference as the tires the factory engineered it for.
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Saturday, May 14th, 2016 AT 8:53 AM
Tiny
GTEUP07
  • MEMBER
  • 13 POSTS
So your numbers do exactly that right? Thank you.
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Saturday, May 14th, 2016 AT 9:00 AM
Tiny
WRENCHTECH
  • MECHANIC
  • 20,757 POSTS
My numbers matched the tire size you gave me. I do not know what it came with.
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Saturday, May 14th, 2016 AT 9:02 AM
Tiny
GTEUP07
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  • 13 POSTS
Got it. Thanks. OEM size is:
235/50R18
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Saturday, May 14th, 2016 AT 10:14 AM

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