Mario Kart Wii Tips

Go Faster On a Bike
If you are using a bike in a race, do a wheelie to increase your speed. If you are using the Wii Wheel, flick it up, if you are using the remote and nunchuk, flick it up and if you are using the classic or Gamecube controller, press up on the d-pad.

Be careful when doing this because if someone knocks into you while you're doing a wheelie, you'll stop completely.