I run 165 80 r15s on my 65 Belvedere with Mickey n50 bias rear.My kid runs 215 75 r15s on the 62 300 with Mickey L60 15s bias rears.Never any problems with either and both get lots of street and strip miles.I had Mickey bias on the fronts of both cars.They were total garbage.Even at the track they were all over the place.Now I can let the wheel go at 120 and it stays straight.Rocky