No, but it is a very useful tuning aid.
Personally I run the RudeBits weight kit, the new 2 piece one. I quite often swap between the 0g/30g/60g options it gives
Typically I run 60g on astro tracks, reduce to 30g if the car is over-rotating late corner in a pendulum style. 0g works great on tight twisty tracks where the surface is a little loose (along with a little less front tire of course)
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