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215 is the number that measures the width of the tire (millimeters maybe, some one confirm this)
45 is the percentage height of the tire from wheel to top or bottom (EX. 45 % of 215 = height from wheel to top or bottom)
17 is the size or rim high, my rims are 17 by 7 wide
40+ offset is the distance from the backside of where the lug nuts go to the center of the wheel, you can have ositive and negative offsets, a picture could explain it more let me find one
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Pioneer Premier, Elemental Designs, SoundSplinter, Resonant Engineering Audio, Stinger, Optima, Rockford Fosgate
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