Tbh i dont know the offset. I need to determine it though cause a couple degrees more negative with the offset it wouldnt fit the wheel. I imagine itd be good info for whoever else trying to jam an 8.5 in wheel in our cars. Id rather spin tires than rip gears and clutches so i havent gone the drag radial route yet. 225 probably will be adequate especially with drag radials. My previous set were 215s on an 8in wheel with falken azenis rt615k performance tires. Those never really spun on 8psi big turbo no idea how much hp or torque. I went the 235 route just for the fitment not really for the added grip.