Ford Mustang Forum - View Single Post - 2015 GT. 255/40/20 and 285/35/20 Will they fit?
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post #3 of (permalink) Old 07-30-2018
JBert
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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.

| 2010 GT coupe | Daily Driver with some Steeda and GT500 take-off stuff for the occasional track day
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