You need alot of equipment to compete. Just like our bigger counterparts (nascar), you need tires, different bodies( aerodynamic purposes), motors, batteries, gears, oils, lubes, chargers, and a soldering iron.
In a typical race week, I will run 20-30 battery packs, and up to 10 different motors, along with 20-30 sets of tires. All this just to find the right comination to win the event.