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Old 12-01-2013, 08:48 PM   #1
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Tire size selection

I have a set of oz superturismo i plan on installing on my 2013 ford focus. The rims are 18x7.5" .
I'm looking and trying to debate between a 225/45/18 and a 235/40/18 and need some help picking the best and safest size for autoX on a 7.5" wide rim

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Old 12-03-2013, 09:48 PM   #2
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Are you preparing the car for any specific class?

The difference between the 2 sizes will be pretty small. My preference when running street tires is to have them slightly stretched. Street tires usually have softer sidewalls than R-Compounds, and a little stretch will help support the sidewall. I would probably lean towards the 225's for a 7.5" wheel. If you're thinking of running STF, then 225 is the max width allowed.
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Old 12-04-2013, 01:15 PM   #3
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Another vote for 225, street tires do not like to be overstuffed on a small width wheel.
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