Racerdave: I have tried the JB foams (blue) with the following results: I tried them because they were so light feeling in the package and a couple of racers were using them with decent things to say about them. Upon installation, one of the inner pieces of foam pulled apart and had to be glued to the wheel. No real problem other than nominal hassle. They otherwise mounted up fine and worked pretty well for about 20 or 25 minutes and then the foam started bunching inside the tire. While I do not dislike them and would use them again in a pinch, the hassle of the two pieces and the bunching problem will steer me to another type of foam if possible. I would be interested in knowing of others had similar experiences when they tried them. Happy New Year!!