track wheels and tires

[The Radium King]

thanks folks. I am building a nasa st-3 car to race with the regional association up here (a modified version of nasa pending full adoption) 20 minute sprints. I am allowed dot tires to 275 (to keep the weight and hp reasonable, anyway). I was trying to keep the initial entry cost down and run on the 17" for the first season (fire suits, transponders, fire suppression; all adds up quickly) but am finding tire sizing limited. I may put the 17's on my street car and move the 18s onto the race car.

regardless, good to know that a 235 works on the 7" front - balance is good with a 235/255 combo?

also, I've read good things about the bf Goodrich r1-s compared to the hoosier r7 - any experience with these?

thanks.