Our SS and PS class MUST run steel wheels (if stock then reinforced) and I run them (stock) on mine. If you use the bearing with the snap ring (I get mine at BMI for 2 bucks each) and don't over tighten them they will last the season. Same bearing that is in the kart hubs just has a snap ring. I was worried about the wheel wearing out where the bearing goes so I reinforce that as well. I have 2 sets of wheel/hubs that BMI sold many yrs ago for 25 buck a pair that were steel and still run them!
Lester