Find bikes and cycles at Target.com! The mongoose boy's 20-inch index bicycle in orange is a great bike for an active, young boy. This orange bmx freestyle bike is made from a sturdy steel frame. Its thick, 2-inch tires and cushioned nylon seat protects the rider from all his little bumps. This 20-inch bike by mongoose has one gear speed. It is recommended for boys ages 8 years and up to 150 pounds. Some assembly is required. . . note: depending upon availability of assembled bikes, bikes ordered online for pick up in store may or may not be assembled. .