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P -passenger tire (I think)
215 - width of the tire tread is 215mm
75 - height of the tire is 75% the tread width (75% of 215mm = 161.25mm)
R - Radial
15 - the diameter of the rim it was made for is 15"
Thanks guys. So if I wanted a tire that was wider but about the same diameter (so I wouldn't have to change my speedo gear) then I could replace my P215/75R15's with P230/70R15's. Does that sound right?