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Standard size - 255/65r16
For 2003 G35 Sedan with Sports Sepspension it is 215/55/R17.
P195/60R14 85H is the original tire size
P215/55R17
Mine came with: Bridgestone Turanza EL42 (NZ) P215/55R17 93V M+S
245/70/16
P225/55r17 95v
22
its written on the inside of your driver door
215/50/17
I got a 2003 Chevy silverado 4x4 z71 stock suspension , and i install on it 285/75r16 tires, that's the biggest tire that you can use, i put that tire size to in a 2002 Chevy silverado work truck 4x2, with no problems. You can trust, good luck.
p265/35R22