Circe

England's Circe Cycles offers two brilliant tandems that convert to cargo bikes. The single most brilliant bit is probably that the second rider (the stoker) can range from about age 4 through adulthood. Bike families with teens know this will save a lot of money over the years, replacing several bikes liable to being outgrown. Riding solo or with a toddler or infant (or both)? Fit a huge rack and it's a cargo bike.