If your car has been lowered at all, bigger tires can sometimes be a challenge to fit without rubbing. I've got 13x5.5" aluminum slotted mag wheels...the backspacing is wrong and they
stick out too far so I was forced to go with low profile tires 175/50-13's all around. Needless to say my speedometer is way off. The key to an accurate speedo is to try to keep the
overall diameter of the tire the same as the stock 12" setup. The bigger wheels you go with, the lower profile tires you're gonna have to use. I'd like to try some 14 inch 280ZX wheels and
185/195-60's all around. I don't know if 15 inch wheels will fit on a lowered 1200. It's a tough job sometimes trying to get the right tire/wheel combo but it can be done.

-Andy