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so, i need to change all four tires on a 2000 Eclipse RS. I went to look at the sizes, and they are 195/65/15 on the back ones, and 205/60/15 on the front. is that right?? Can the tires really be interchangeable like that. I thought correct size was 195/65/15 for all four
 

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This

Lets look at the tires listed in the 18" size.

In the tire size 225/40-18, 225 is the section width of the tire in millimeters. 40 is the aspect ratio (percentage) of the sidewall compared to the section width of the tire.

Example: the sidewall of a 40 series tire is 40% of the section width of the tire, which is equal to 90 millimeters for a 225/40-18 tire. The sidewall of a 45 series, 215mm tire is 96.75 millimeters. The 40 series tire will have a smaller sidewall (lower profile) than the 45 series tire. The sidewall of a 75 series 265mm tire (truck tire) is 198.75mm. The last number in the tire size is the required rim diameter needed to mount a specific tire.
is taken from here in the Wheels, Tires, Brakes, and Suspension forum.
 
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