Mercedes Benz Classics: Owners Operation, Service, and Repair Workshop Manuals

MB 105 – W180

Ponton / Roundy Nicknamed Series Mercedes Vehicles

The Mercedes Benz Ponton Roundy term comes from several series of Mercedes Benz vehicles that carried a similar body style through their sedan models. These included the following:

MB W105 | W120 | W121 | W128 | W180 Series Models

MB W105 Model 219 Ponton Sedan Saloon’s

  • W105 219

MB W120 Model 180 Ponton Sedan Saloon’s

  • W120 Models 180, 180a, 180b, 180c, 180D, 180Db, 180Dc Sedan’s

MB W121 Ponton Sedan’s, Plus Coupe and Roadster Models

  • W121 190, 190b, 190D, 190Db Sedan’s

MB W127 Roadster Prototype  — Big Brother to the 190SL

  • 220SL – M180 2.2 Liter 6-Cylinder Motor

MB W128 Ponton Senan’s, Coupe’s, and Cabriolet’s

  • W128 220SE Sedan’s Coupe’s Cabriolet’s

MB W180 Ponton Sedan’s, Coupe’s, and Cabriolet’s

  • W180 220a, 220S Sedan’s

The Mercedes Benz Ponton Roundy Nickname

The nickname Ponton comes from the German word for “pontoon” and refers to the defined style of pontoon fenders — and a postwar styling trend that was subsequently identified as Ponton styling. It started with Daimler-Benz’s first totally new Mercedes-Benz series of passenger vehicles produced after World War II. Beginning in July 1953, these cars utilized the bulk of the Mercedes Benz production line for several years before being phased out between 1959 and 1962.

Work began in earnest on the Ponton body cars in 1951, with a design focused on passenger comfort and safety. There were essentially four types of Ponton cars. Note the “D” designates a diesel engine, and the suffix “b” and/or “c” are body variants introduced after the middle of 1959.

The W127 Prototype Built on the W121 Roadster Chassis

The W127 was essentially a big brother being built on the W121 190SL Roadster Chassis -and pepped up with the 2.2-liter six-cylinder M180 engine from the 220 ponton sedan. To spice it up even more, fuel injection and a touring specific camshaft cranked up the output to 117 hp. The size of the 220 engine dictated body modifications such as a recessed bulkhead and increasing the strength of the transmission tunnel to accommodate the six-cylinder engine and a four-speed gearbox into the W121 190SL chassis and body shell.

Two such cars were produced and they were given the internal code W127
As they were the fourth and fifth trial cars with a larger engine, they were named 190SL /4 and 190SL /5

Mercedes Benz W127 220SL Prototype

As fate would have it, the W127 220SL production plans were terminated in favor of a completely new design. This new car, known internally as W113, was called 220SL during development and introduced in 1963 as the W113 230SL.