15/8 5.5bs and 15/7 4.75bs biggest tires please

on 15x8x5.5 275/50/r15 will fit with rolled fender lips in the rear. I will be going with 295/55/R15 for my next set of drag radials. As for the front, I run 165/80/R15 skinny tires so cant help ya there. For the brand. I have heard that about nitto's too. I run M/T drag radials on mine. I would recommend that you not use them as street tires though. If you get caught in the rain its like steering from the rear of the car. They also wear out guick on the street as they are very soft for the track. I only got about 3000 miles out of my last set And only made 4 passes at the track. I like them. you just need a set of tack tires & a set of street tires.