it's not about choosing to go skinnier, it's about having two sets of rims, one set is 8" so they will be my circuit rims as they are more suited to the 235 rubber and another set are 7" so they will be my skid rims because I don't take drift seriously and don't mind if I bang them up plus they will suit the thinner cheapr rubber I have on hand that I don't mind burning up.