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Been doing it for almost 8 years now with both 39.5's and 42's. Always used 2000 of the .20G bb's and have had the truck up to around 90Mph running as smooth as when it was on regularly balanced 35's.
I have them in my 38.5 SX's right now. They work real good. I used the same chart that ChrisPerry posted up. I always say use that chart, and throw a little more in there for good measure. Most guys who say it doesn't work didn't put in enough
About a pound of the 20g BBs in each of my 38s. I started with stick on weights, but as they fall off and CHUNKS of tread come off, the BBs take over. Either way, I'm not re-weighting them.