the studs are strong, get the ones from here ATV wheel spacers they are the best, my buddy runs them and they are nice, i'd just get the 3 inchers, they make a good difference
i say STAY AWAY from stud spacers ALWAYS,,,,,,if im going to get spacers its going to be the ring or block type spacers........but thats just my opinion and to each his own.......ring spacers FTW
Im heavier than the average blaster owner, Im running my fronts flipped and 3 inch stud spacers on the back and I have no issues in any of the terrain I ride in (mostly rocky and jumpy).
The 3 inch ones in the back seem to be holding up fine.