So, I've ordered new tires for my '07 G35s sedan. My car has OEM wheels from the first generation G35 on it, 17's.

I ordered 4 of the same tire to fit the wheels: 215/55R17

Then, I noticed that the '07 G35 Sport came stock with slightly different tire sizes -

Front: 225/50R18
Rear: 245/45R18

QUESTION: Can I install the original front and rear sizes on my 17" wheels (different from the stock 18's)? Will that work? Should I do this considering what's best/most natural for the car?

Appreciate anyone's thoughts as I ordered the tires online over the weekend and may need to change the order

 

Used this tool to help figure it out: http://www.miata.net/garage/tirecalc.html

Determined that 225/55/17's all around will make the most sense, I think the only improvement would be 245/45/18-equivalent on the rear wheels, however there is no such thing in 17" for the tire I want (Michelin Pilot Sport A/S).

 

I would've gone 225/55/17 just like the stock 07-13 g35/37 tires..

215/55/17 would throw off the speedo, SLIGHTLY.