Hideeho
I have been running the jc cups for a few months now. I just popped my 1st cup on my b44 (I've been running them on my b4 & b44). I got taped on launch from a big jump & got seriously out of control in the air. I came down on 1 wheel, broke the arm & popped both ends of the steering link. To test their durability (it was a practice day so it didn't matter) I popped it back on. Next run I hit a dirt clod on the straight, spun & got plowed by an ebug at full throttle. It broke the other arm & popped the same steering link off (other side from the break this time). Again I left it on for the next pack, this time with no major mishaps or breaks, & not popped cups. I'll run it again for warm ups, but it is looking like they are just as durable as the RPM's. Once they pop they need to be replaced, but it should be quite a while before they pop. I don't see them being any better than the RPM's, just MUCH more convenient with the hole in the top.