2015 GT. 255/40/20 and 285/35/20 Will they fit? - Ford Mustang Forum
 
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post #1 of 7 (permalink) Old 07-29-2018 Thread Starter
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2015 GT. 255/40/20 and 285/35/20 Will they fit?

Ive got a 2015 50 years GT with lexani 255/35/20 and 285/30/20 tires, hate em. Looking at some Michelin Pilot Sport 3s with a little more sidewall. Anyone run 255/40/20 and 285/35/20 without problems?

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post #2 of 7 (permalink) Old 07-30-2018
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The rears 285/35's will definitely fit. Common size. Surprised you have a 285/30 to be honest, that's a weird size, and shorter than stock. 285/35's is what should of been put on.

The 255/40's, I don't don't know, that's a full inch taller, but should work. That'll be about identical to a 285/35. I have an S197, so I can't say for sure though. The 285/35 absolutely, the 255/40, should, but not certain.


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post #3 of 7 (permalink) Old 07-30-2018
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255/40-20 tire is about 28" tall (outer diameter); 285/35-20 is just a hair shorter. That is about 1" taller than the "normal" 27.2", assuming the normal has not changed with the S550 cars. That is only about 1/2" on the radius and I believe it should clear with no issues, assuming the car is not extremely lowered.

My experience is also with the S197, hope someone with direct S550 experience will chime in.

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post #4 of 7 (permalink) Old 08-01-2018 Thread Starter
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heres a pic of of the space ive got.
[IMG][/IMG]
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post #5 of 7 (permalink) Old 08-01-2018 Thread Starter
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it looks like i have enough clearance but i dont know. I have the tires now, putting them next to the wheels on the car now but its hard to tell if theyll work. Hopefully the tire guys at NTB can tell me they definitely fit before they put them on. If the tires are mounted they cannot be exchanged by tire rack.
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post #6 of 7 (permalink) Old 08-02-2018
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Quote:
Originally Posted by holton0289 View Post
it looks like i have enough clearance but i dont know. I have the tires now, putting them next to the wheels on the car now but its hard to tell if theyll work. Hopefully the tire guys at NTB can tell me they definitely fit before they put them on. If the tires are mounted they cannot be exchanged by tire rack.
Agree with JBert and his findings. I dont believe you will have any issues after looking at your picture, but I have not bought aftermarket wheels(yet) for my S550. One thing to keep in mind - I've heard Michelins tend to run a little wider than advertised, and I tend to agree from my experience.

Tire size calculator will help you out:

https://tiresize.com/calculator/

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post #7 of 7 (permalink) Old 08-02-2018 Thread Starter
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had them put on today. Fit perfectly. Thanks for the help.
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