Mario Kart Wii Tips

Holding Items
Although I imagine many people know this, I've still seen people saying 'Drop the weapon just as the red shell is coming at you' so this will help.

Rather than dropping the weapon a few seconds before the shell hits you, simply hold the button which you use to throw the item. Holding the button will leave the item behind the kart, so if a red/green shell is coming at you it will hit the item instead. Characters can also drive into the item if they're tailgating you, which comes in handy.