hmm ,this is interesting as my b6100 has the wheel an hub reversed of picture , Im thinking there is more than than one way to mount those hubs to wheels and hubs to axel , I well have to have a go as Ive rolled mine more than once and I have NO ROP . and its not fun pushing it back on its feet . 2 " on each side would make a lot better footing on mine .... good post..Jerr