look next to the valve stem, there should be a 2 or 3 letter code. look it up in the back of the owner's manual and it'll tell you exactly what you've got.
Two other measurements to bear in mind when purchasing aftermarket wheels..
1.. the depth of rim from where it fits the hub to the back of the rim.. too much and this can cause the tire to rub against the inner fender when full lock or near is applied..
2.. The depth of rim from where it fits the hub to the front of the rim.. too much and this can cause premature failure of standard hub bearings and suspension/steering..
Some wheel/tire combo's require that the body and or suspension is lifted.. If you don't get the answers here, go to a place that specializes in wheels/tires/suspension.. go anyway, and btw, I don't consider places like Midas or Meineke to be specialists..
Good luck in your search..
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