"Look closely at the 350Z's suspension and there's only one obvious reason why it shouldn't be balanced--the front tires are smaller than the rears. This may seem a laughably naive question, but why? Two reasons: It looks tough and it makes the lawyers happy.

Screw the lawyers.

Nissan engineers left an insane amount of room for wide tires and, naturally, there's more room in the back than up front. This has led most people to continue this ludicrous staggered tire setup by trying to stuff the rear wheel wells with as much tire as possible. We went the opposite way, stuffing as much tire as possible under the front fenders and then using that size at both ends.

You can measure and calculate all you want, but the only way to really be sure what size tire and what wheel offset you need to completely fill a wheel well is trial and error. We found, conveniently, that the rear tires Nismo uses on the Z--275/40ZR-18 BFGoodrich g-Force KDs mounted on 18x9.5-inch wheels with a 30mm offset--actually fit the front perfectly."