Tire size
I can't answer your mismatched tread question, but tire size numbers mean the following:
245 This number indicates that your tire has a width of 245 millimeters
60. This number means that your tire has an aspect ratio of 60%. In other words, your tire's sidewall height (from the edge of the rim to the tire's tread) is 60% of the width.
18 diameter of wheel rim in inches
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