Wheelies Give Small Boosts

Wheelies on motorbikes appear to give you a small boost in Mario Kart Wii. Use them on long straights as your steering is slightly impaired whilst you are balanced on the back wheel.

Press down on the D pad on the Game Cube controller to wheelie, or flick the Wii wheel.

Note, that being on a bike also makes you very susceptible to being knocked around and even off the track.