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My tires say 165-r-15 (I added the dashes). I was told stock tires were actually 78 series. Anyway, the tire calculator site can be set for 80 or 75, so the conversion for 205/55-16 tires would be: 70 MPH reading is actually 68.58~70.38 MPH ... close enough for me. Now, I'm assuming the speedo is reading the rear wheels but I don't know that to be a fact. The 45 series tire is a smaller circumference.
Part of me would like the same size on all fours, but I'm concerned of rubbing the tires on the front if I stick with the 55s and lower the front -- even mildly.
So I guess a different query would be: Would 205/55-16s fit under stock front fenders when lowered 1½-2 inches? If not, would the understeer be more pronounced with 45s up front and 55s in back? 205/45-16s on all fours would be too screwy for the speedo (64.13~65.81 when reading 70).
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