I had the bearing issue this weekend. It was my first organized race event. It was only the left rear inner and outter bearing but after 3 - 5min quals they were blown. Then after the 30 min main they were blown again. I used new losi bearings the same ones I used when I raced my 1.0. I never had this many issues. The track was fast and mostly smooth a small rythum section and one drop off but not a rough track at all. I think I'm going to have to upgrade to a larger bearing like some of you have done. Anyone have any more info on the king headz rear hubs?