I appreciate the thought. My main reasons for not running BBs in the tires is because I want the tire to be able to flex/conform to the terrain as much as possible. So while I don't mind adding a bit of weight in the wheels, I prefer to have ample room for foam. Also, generally speaking I prefer to keep the weight on the body, as opposed to the wheels. I just do this for more realistic performance, but I'll sometimes add a smidge of weight to the front wheels. All that being said, I really don't know what to expect with the performance of this truck. Honestly, I'm not even sure what kind of terrain I'll be running it on. So my thoughts on all this may change once I get it running.