Safety issues with 3 wheel ATVs caused all brands to switch to 4 wheeled models in the late '80s, and 3 wheel models ended creation in 1987, due to consent decrees among the key brands and the Consumer Product Safety Commission the result of legal battles over issues of safety among customer groups, the manufacturers and CPSC. The lighter weight of the 3 wheel models made them common with some expert riders. Cornering is more challenging than with a 4 wheeled desktop because leaning into the turn is even more crucial. Operators may roll over if caution isn't used. The front end of 3 wheelers without doubt has a single wheel making it lighter, and flipping backwards is a potential hazard, especially when mountain climbing hills. Rollovers may also occur when touring down a steep incline. The consent decrees expired in 1997, enabling manufacturers to once again make and market 3 wheel models, though there are very few advertised today. Sport models are built with performance, instead of utility, in mind. To be successful at fast trail riding, an ATV must have light weight, high power, good suspension and a low center
of gravity. These machines can be changed for such racing disciplines as motocross, woods racing often known as hare scrambles, cross nation, desert racing, hill climbing, ice racing, speedway, TT Tourist Trophy, flat
track, drag racing and others. Examples of high performance models consist of the Yamaha YFZ450, Honda TRX450R,Suzuki QuadRacer R450, Kawasaki KFX450R, and Can Am DS450.