I have a 2000 zx2 that I'm taking dirt track racing this year. It is 5 speed and I'll be running 2nd gear. The track is 1/4 mile dirt with medium banking. My question is what is the biggest (tallest) tire I can fit under the front without rubbing the struts? And what size will keep me just below 7000 rpms? The only mods on the car are a header and straight through muffler and I did the keman mod to the intake.