It's time to order some new rear tires, mine are 99.5% shot. Currently I have Sumitumo HTR-Z's in a 315/35/17 size. I am considering either going with them again or trying the Nitto 555's, NOT the 555R drag radials. They get a "300" score for their tread wear rating as compared to a "160" or "180" (can't remember) for the Sumitumo's. Just wondering if anyone could post up their thoughts/experiences about the Nitto 555's as far as how they hook up and most importantly tread life. My Sumitumo's have lasted me around 20k +/- abusive miles. The Sumi's are about $100 cheaper per tire, so if they are close in comparison I will just go with the Sumitumo's again.