Bits are things in Kart Kingdom that are used to make power ups, karts, stickers, wheels, gadgets, masks (Very rarely though), hats (Also very rarely), etc. It is one of the main things of Kart Kingdom. Bits can be earned by playing games, playing quests, etc. Some are popular, some are not. Some are rare, some are common. Bits can also be earned in Events, like the Fourth Of July Event.
When Gus comes to Kart Kingdom, he asks for bits.