The Chevrolet K5 Blazer is a full size sport utility vehicle that was built by GM. GM's smallest full-size SUV, it is part of the Chevrolet C/K truck family. Introduced to the Chevrolet line for the 1969 model year. The K5 Blazer and Jimmy had "full convertible" removable tops until 1975. For 1976, GM introduced a half-cab design that was less prone to leaks and slightly safer in a roll-over. These half cabs had the convertible top begin a few inches behind the driver/passenger doors and run back to the tailgate. The Blazer was designed and marketed to compete with the Ford Bronco, both originally aimed at the Jeep CJ series. The innovation of the Blazer was to simply offer a shortened pickup truck, which both increased interior space, and lowered the cost of production with a shared platform. The Blazer quickly became popular. By 1970, the Blazer was already outselling both of its older rivals.