This book provides an in-depth engineering analysis of the twin-cylinder motorcycles produced by Veloce Ltd—the Roarer, the Model O, and the LE. It explores the design features these machines shared, the influences that shaped them, and the innovative engineering that set them apart. Although best known for its single-cylinder motorcycles, Veloce also produced advanced twin-cylinder designs. The Roarer, a supercharged racing prototype, introduced groundbreaking ideas such as contra-rotating crankshafts, inline cranks, shaft drive, and swing-arm rear suspension. The Model O, conceived for production, might have been the world's first true "Superbike" had the outbreak of war not halted development. Postwar, these innovations carried into the LE, Veloce's "Motorcycle for Everyman, " though its lukewarm reception is often cited as contributing to the company's decline. Written by Brian Agnew and Ivan Rhodes, two engineers and enthusiasts with decades of hands-on experience, the book compares and contrasts the Roarer and Model O while tracing how their concepts influenced the LE. Rich in technical insight, it also covers the company's history, design philosophies, and even the development of a four-cylinder racing engine. Key FeaturesDetailed engineering study of the Velocette Roarer, Model O, and LE twinsCompany history and adoption of the Velocette trademarkThe influence of Stanley Woods on Velocette designInsights into the work of designers Phil Irving, Harold Willis, and Charles UdallThe "Motorcycle for Everyman" and the LE's controversial receptionTechnical comparisons with contemporary motorcycles from other manufacturersAnalysis of the Model O as a potential "first Superbike"