In my experience 205/50/15 are the biggest I could go and during U-turns they would rub on the fenderwells. A 195/50/15 doesnt seem to have this problem; however, this is also dependant on if your car has been lowered also.
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I had a '93 Sentra Classic (B12)
Mom's got an '03 Altima 2.5S
Dad had a '98 Sentra GXE
Current "rides": 2000 Kona Caldera "Callie", 1996 Specialized Hard Rock "Betty"