In most driving games, the car is controlled by moving the Wii Remote as a steering wheel. The Wii Remote snaps into the Wii Wheel accessory, making it easier to control and more comfortable to hold, or simply improve the external appearance. The steering wheel is included in three games that come out with Wii : Monster 4x4 and GT Pro Series (if the controller developed by the Ubisoft company is used, in addition to the well-known Mario Kart (if Nintendo's Wii Wheel is used). The price Approximate value of the adapter is about €10.
They can be purchased in 2 ways: the first is by buying it with the Wii game, Mario Kart, which costs €50 or, somewhat cheaper, for €10, but without a game.
Source Wikipedia
-ONLY THE STEERING WHEEL ENTERS!!!!