I think the wheel balancing weights being referred to are the 5g and 10g self adhesive weights used to balance full sized car wheels which are commonly used to add balast to out 1:10 cars.
I think part of the reason for adding wieght to a rear mounted motor 2WD is that the brushless motors are significantly heavier than brushed and LiPo's lighter than NiMH, the prevelent form of propulsion when the cars were developed. Brushless/LiPo also provide more torque that NiMH/Brushed. If you don't add any weight then these effects are going to combine and your car will want to wheely all over the place.
I've been thinking about trying brushed motors agian in 2WD and running a little lighter as I like the nimbleness when changing directions and through sweepers.
Ben
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