i doid not read anywhere for such a rule but think if you already have to have a legal motor is good thing to have high level esc to sqweeze the max out it, i have an lrp spx but do not ever heard that someone is using it on big competitions. I think that only rule is that the esc must be 7,2v powered.
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Tamiya:
trf 502x
f103gt
df-03
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