grandpajay

I need help picking the correct tire size for some new wheels. I have a 2006 GT that is dropped 1.5" on Ford Racing K-Springs. I'm looking to buy a set of Jegs Sport Lite Cast Aluminum wheels, 15x8 up front and 15x10 in the rear. what size tires do I need? I'm looking for street performance tires if anyone just wants to lay down 2 links for me. otherwise tire sizes will do just fine I'm looking to really fill up the rear wheel well

Fox Fader

Why not go with a more modern size?
If not, Google the miata tire size calculator and use it.

18
Fr 255/45
Rr 275/40
19
Fr 245/45, 255/40
Rr 275/40, 285/35
20
Fr 245/40, 255/35
Rr 275/35, 285/30

JThor

Will 15" wheels fit over your front brakes? 17" was OE on the GT. I don't think 15's will fit.

Your best selection of performance street tires will be in 18" right now.