The Adams Trail-a-Bike Original Folder tandem bicycle makes bike trips fun and accessible for the entire family. Ideal for 4- to 7-year-old children who have outgrown the bike trailer, but who can't keep up on their own bikes yet, the Trail-a-Bike folder is the perfect transitional option for family outings. Designed with a unique and patented top tube radius to fit both 26-inch and 700c wheeled adult bicycles, the Trail-a-Bike allows young children, up to 85 pounds, to pedal along with the grownups, learn the rules of the road while protected and guided by an adult rider, and bike farther than they could on their own bike.