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You took a 6 for a 9? (Sorry, I couldn't resist)
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And if its true its explains why my system still so hot and why i burned 2 BK9920 on 5S. And it was geared to 40mph brians calc

. I am actualy never measured top speed only raced. And if its right it means that my truck was geared before 57mph.
OK KB45-10L motor just arrived which is ~1800KV so i will hook that motor and measure No Load Current and RPM and try Compare with feigao