技術解説Japan
The Rare 'Single Cradle Frame': How It Works and Why It Faded Out
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A feature explains the single cradle frame, in which one down tube wraps from the front to the underside of the engine. It reportedly lost ground to double-cradle designs around the 1950s-60s due to insufficient torsional rigidity, with the Honda Dream CL72 Scrambler cited as an example. The Yamaha SR400/500's semi-double-cradle is presented as a middle-ground compromise.
