Is ZR rating the same as R ?

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Apr 7, 2010 | 02:48 PM
  #1  
Quick question.

I have Pirelli P - Zero Nero's on my sti.

need to replace the front two and notice that they are 225/40/ZR18 (92Y), whereas the back two are 225/40/R18 (92Y).

Is there any difference between the two (I'm guessing not but thought I'd ask anyway )

Cheers
Rich
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Apr 7, 2010 | 03:47 PM
  #2  
it's the 'y' in brackets that indicates 'tested in excess of' 186mph. Z just means in excess of 149mph. the R simply means radial... the 92 before the 'y' indactes a load index of 1389lbs.
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Apr 7, 2010 | 06:28 PM
  #3  
cool thanks
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