Bike

Bikes are a new element in Mario Kart Wii and are an alternate means of driving to Karts. Although they feature the same basic attributes, there are differences; Bikes weigh less than Karts; Bikes are able to perform wheelies to boost one's speed for about four seconds (albeit at the cost of a reduced turning ability) but can be cancelled earlier by hopping or making a sharp turn; and Bikes are rendered incapable of doing Super Mini-Turbos. Similiar to Karts, Bikes are classified by weight. They're recommended for Time Trials because they have superior turning and their ability to conduct wheelies, and also that they can do midair tricks too.