The "ball ends" are the same size on the BMAX as AE, Losi, JC, Etc...I use Losi HD Ball Cups with no issues.
The difference is the threading of the "ball studs"(metric v. imperial), but this doesn't effect the actual size of the ball. It only effects what you are screwing it into (especially aluminum parts)...make sense?
I think Kyosho's have bigger balls
