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what happens if you put 285/30/18 instead of 295 on the rear?


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For 295/30/18, the choices are PS2, AD08, CSC2, and others. However, I realize if I go instead with 285/30/18, there's a Federal 595RS-R that is half the price of the usual 295/30/18 choices.

The shop tells me the only thing would be the rims would stick out a little. I'm not exactly sure that he means by that... Can't visualize it. Otherwise, using 285 is completely safe. Is this true?? Any potential issues with the downsizing??

I'm using stock alloy wheels.

Thanks!

D.

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With the different diameters, your PSM likely will be kicking in at inappropriate times (even if you don't destroy the diff).

Have you looked at Hankook Ventus V12's? I just put a set on mine at about half the price of the Michelins. Reviews on Rennlist and 6speedonline are mostly positive.

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  • 4 weeks later...

I run Continental DW Extreme 285/30/18's in the rear and 225/30/18 in the fronts since they don't make 295's.

The difference in diameter of these two tires is almost zero. Car handles great! Did several AutoX and DE's at Road Atlanta on them. They are great tires.

Don't worry about the difference between 295 and 285 - but as others said the diameter differences of your tires front to back.

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  • 3 years later...

I run Continental DW Extreme 285/30/18's in the rear and 225/30/18 in the fronts since they don't make 295's. The difference in diameter of these two tires is almost zero. Car handles great! Did several AutoX and DE's at Road Atlanta on them. They are great tires. Don't worry about the difference between 295 and 285 - but as others said the diameter differences of your tires front to back.

 

Hi cannon1000, may I ask you to reconfirm Conti DWs you have (had) on your 996tt? 

225/30/18 does not exist - was this a typo? 

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