For 1950, Chevrolet came up with a revolutionary style that would set a pattern for decades. The Bel Air Hardtop was styled as a convertible with a non-detachable solid roof. The first Bel Airs of this era shared only their front sheet metal ahead of the A pillar with the rest of the range. Apart from the usual annual grille and trim changes, the 1951–1952 Bel Air differed from the earlier 1950 model with introduction of the higher and squarer rear guards that were across the whole range. In 1953 Chevrolet renamed its series, and the Bel Air name was applied to the premium model range. Two lower series, the 150 and 210, also emerged (as successors to the Special and Deluxe series, respectively). The 1953–1954 Chevrolet range had a unique and somewhat awkward look about it and much of this stemmed from its role as a transitional model to introduce a raft of changes that were necessary to pave the way for the introduction of the Second Generation Bel Air.