Well I am running k-sport springs and agx shocks. I was told that the springs gave approx. a 2" drop front and rear. Although I highly doubt that, this set up is just for the time being. I intend to run this setup for only a year then upgrade to coilovers.

Now the actual question. Because this is a fitment/spring/tire size question I didn't know where to put it. I am running 225/45/17 in the front and 245/40/17 in the rear. According to the tire size calculator on miata.net the ideal rear tire size to match up with the fronts would be 255/40/17, reason being the fronts are the newer set. The fronts seem to fit better.

The rear tires need to change and I was wondering if hypothetically speaking I switched to 245/45/17, which is for the most part a higher tire would it affect the negative space the wheel well has?

Or will it just hoist the car up more. The reason I have this question is because with the same setup I ran 235/40/17 and it filled the front wheel well up more than the newer set which are 225/45/17. I was just wondering if it would do the same for the rear.

Thanks guys