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First decide how big rims you are looking for. 24? 22? 20? Then you look for your tires. 245/55/R18 means 245 Width of the Tire, 55% of it is Profile (on both sides, front and back) and 18" inch rims.
So for example, maybe you want 275/40/R20... usually for the rears for 20". So 275 Width, only 40% of 275 is profile, and Rim 20s.
Do you kind of understand the numbers now? for 20" fronts, its mostly 245/45/R20.
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