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Biggest tire for a 18x9.5 wheel, help please!!!

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Old 04-24-2007 | 07:43 AM
  #21  
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Originally Posted by Armitage
Is a 35 series sidewall still enough rubber to protect the rim?

I'm looking into this same exact situation right now (Work Emotion CAI) but I am looking at running the +20 application, 8.5" up front and 9.5" rear. I was going to run 245/40 in the front and 275/40 in the rear as this seemed to be the optimal setup, but the KDW-2's don't come in a 275/40 but they do come in a 285/40. I am not lowered yet.

From what I've researched:

225/40 --> 255/40 = .2% too slow on the speedo
225/40 --> 255/35 = 3.6% too fast on the speedo

245/40 --> 275/40 = .01% too fast on the speedo
245/40 --> 285/40 = 1.1% too slow on the speedo
245/40 --> 285/35 = 3.1% too fast on the speedo

I don't want to upset the VDC either if it detects a difference between the tire speeds if I run a 40 series up front and a 35 series in the rear.
I was going to run the 285/40 in the rear, and the 275/35 in the front.
Old 04-24-2007 | 10:12 AM
  #22  
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+1 for not going any bigger thar 285

thats what i have right now on my LMGT-4's and they are nice and girthy. i have BF goodrich KDW2's all around and compared to the stock (read crappy) potenza's, these things are incredible. good luck
Old 04-24-2007 | 11:45 AM
  #23  
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Originally Posted by redlude97
285's are the widest recommended width for a 9.5, so 285/40/18 if you can find it
im running a second set of 295x35...you can squeeze in a 305 btw
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