2005 Mustang GT- Need tire size advice...

FiremansGT said:

My current set-up is 255-35-20 front and 275-35-20 in rear, I want to get the Nitto 20" drag radials but I have only found 275-40-20 and 305-35-20, which one would work best?? any advice would be great...

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The 305 is over an inch wider. Otherwise the rest of the specs in regards to size are very close. This is due to the aspect ratio of the sidewall height being expressed as a percentage of the width. therefore the 40% aspect ratio of the 275 (4.33 inches sidewall height)is very close to the 35% of the 305 ( 4.20 sidewall)

The link below is very useful in comparing stock or any aftermarket tire sizes with each other. try it and you can see waht you can expect from the various size tires you plug in. Personally I'd go with the 305/35/20. Nitto also makes a 315/35/20 in the invo type tire. check them out on discount tire direct.com


U.S And Metric Tire Size Information Calculator


Nitto tires for car & light truck

Will the 305 rear fit on 20x9" Shelby's

FiremansGT said:

Will the 305 rear fit on 20x9" Shelby's

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IMO you'd be better off putting that wide of a tire on a 20x10 rim. It might fit a 20x9 but it may bulge. You might want to ask the people that mount your tires? but IMO you'd be better off with a 20x10 rim

FiremansGT said:

Will the 305 rear fit on 20x9" Shelby's

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If you go to the Nitto web site you can see what rim with is recommended for the tires. 10" is minim

Nitto Tire - High Performance Tires for Car and Truck Enthusiasts

FiremansGT said:

Will the 305 rear tires fit on 20"x9" Shelby rims?

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travelers said:

Nitto recommends a minimum 10" wide rim for their 305 tire width.

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travelers is right. You would need a 10" wide rim for the 305s. The GT500 comes with 9-1/2" wide rims and they don't even recommend mounting 305s on them.