mate,
if you are on a budget just try the gear you got.
You will soon figure out what you need to compete, i would say with a hot brushed motor the batteries you have might not have enough capacity.
But as the man says until you can race for 5 minutes without crashing you probably dont need a faster motor.
Tires is very important just make sure to get the ones that work on the track you are racing. theres no point in spending money on 5 different tire types to find only one works!
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