A tri link Suspension provides more axis of movements(3 axis of movements) than a 4 link or a 5 link. It can provide additional movements compared to MacPherson Struts, Trailing arms and A arms and so it's more useful in ATVs. read more
These safety issues with three-wheel ATVs caused all ATV manufacturers to upgrade to four-wheel models in the late 1980s, and three-wheel models ended production in 1988, due to consent decrees between the major manufacturers and the Consumer Product Safety Commission—the result of legal battles over safety issues among consumer groups, the manufacturers and CPSC. read more