well, the oem nismo wheels are 9.5 wide front and 10.5 wide rear and we run a 245/40 19 (f) and a 285/35 19 (r)
You could still run the 245/40 tire up front no prob but your stock 275 rear would probably be too stretched (at least for me) on that 11" rear.
If you replace all four, you could choose for the front from the following sized that many folks here have: 245/40, 255,35 (not enough sidewall for me on this one), 265/35, or even 275/35 (this one maintains the exact same aspect ratio as the stock 245/40).
for the rear: 285/35 (will be stretched some), 295/35, 305/30 (very popular around these parts) and would work perfect with a 11" wide rear wheel.
Now, if you are lowered etc, you'll have to check and see which sizes will work with your offsets so you don't rub going over bumps, turning etc.
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