I run the Masher 40 series tires with the 3.8 BeadLock rims on my Emax. I did the duct tape thing, and balanced all four tire (as you guys suggested). Both, the duck tape and the balancing thing made a huge difference, and I thank you all for the tips. My only problem now is; ever since I took my wheels apart my tires slip out of the BeadLock ring. At first, all four did it. I tried using hairspray to provide some stick. Plus, I re-drilled the holes and installed 2.5 x 10 mm hex srews replacing the 2.0 x 10 mm ones in order to get the ring tighter. Since I've done that, only two tires have broken loose. Unfortunately, two is two to many.
The only thing left (that I know to do) is to glue them. I hate to do that, cuz I like knowing I can take-em apart if I have to. Do any of you guys have any suggestions, or is glueing my only recourse?