My 5y old son has a b4.1 and his 8y old nephew has a b4, both with a standard mabuchi on 19/81 and nimh and tamiya teu and lrp f1 speedo.
Nice speed (estimate 20-30kph) but more importantly: CONTROLABLE
AND TAKE 'EM TO THE TRACK! IT'S MUCH MORE FUN AND LEARNING THAN THE DRIVEWAY!
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