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Tires/changing tire sizes



I have a Mazda 2010 CX-7 with 215 70 r17 tires. But it seems that only Bridgestone makes that size. I was wondering which tires would be better to replace them with?

A 225 65 r17 or 235 65 r17? Why and what will be the benefits if any?
Thank you for your time and attention....


According to Discount Tire, the 235/65R17 will not fit.  It will rub.

Is the 225/65R17 is good choice?  Yes, it is about 1% off for the diameter, so doesn't affect the speedometer enough to worry about - and it has enough load carrying capacity.

Tire size has hardly any affect on things compared to the differences between tire, so careful selection of the tire would pay way, way more benefits than the change in tire size.  


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Barry Smith


I have over 30 years experience in the design, manufacturing, and testing of tires. I have served as the technical advisor to the "800" number. I have authored or co-authored many publications - usually without credit. I can answer almost any technical question, but please don`t ask me to compare brands. I probably have prejudices because of my work experience.


Member SAE (Society of Automotive Engineers) Member Tire Society (Tire Technical Organization) SCCA Regional Competiton License holder Authored many training manuals on tires, their care and use.

SAE (Society of Automotive Engineers) SCCA (Sports Car Club of America) Tire Society

You may want to visit my web site:

I am a graduate of the University of Dayton, Dayton, OH - BME, 1971 I attended graduate school at the University of Akron - but did not complete my PhD - something I regret.

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