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The 65 series tire will be wider if both sizes are equal. Example is 205/70-15 versus 205/65-15. The 65 series will be wider but have less overall diameter.

The series of the tire is a height to width ratio. A 65 series tire has a height that is 65% of the width, so a 205/65 tire is 205 millimeters wide and 205*.65=133.25 millimeters tall (rim to tread). Since it's usually not recommended to change tire diameters, if you want to go wider or narrower you need to change the width and series. For instance a 205/70 will have almost the same diameter as a 225/65.

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12y ago

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