Roadmaster, the name previously applied to sub-luxury Buicks in 1936, was promoted in 1946 to the top of the line, as the Limited series was discontinued. Its meaning was obvious: Master of the Road. And so it was, each year having the longest wheelbase, the largest, most powerful engine, and the most lavish trim. In a marketing scheme that was almost counterintuitive, Roadmaster nearly always had the greatest array of body styles, reaching an apex of seven in 1950, when the offerings ranged from sedans to convertibles and a four-door, wood-bodied station wagon. In between were no fewer than three Rivieras, two of them hardtop coupes and one a “post” sedan. By 1955, though, the Roadmaster line had contracted to just three models, a sedan, a hardtop coupe, and a convertible.
For 1957, however, Roadmaster expanded again, into two series, the 70 and 75. All Roadmasters were now pillarless, and there were Riviera hardtop coupes and sedans, both with and without the controversial three-pane rear window. Roadmaster 75s were highly trimmed and included all power equipment, except air conditioning. The sole convertible model was in the Series 70 and came with leather upholstery and a padded dashboard.
1957 Buick Roadmaster Convertible Series 70: 300 bhp, 364 cu. in. OHV V-8 engine, Dynaflow automatic transmission, coil spring independent front suspension, live rear axle coil springs, and four-wheel hydraulic drum brakes. Wheelbase: 127.5 in.
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