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The paper describes the design and development of a five speed gearbox for the Royal Enfield ‘Bullet’ range of motorcycles and a four speed + reverse variant for industrial, light car and similar applications. The design specification for the five speed gearbox called for a directly interchangeable unit with the sting Bullet four speed gearbox, providing either right or left-hand gear shifting, to meet local market preferences/statutory requirements worldwide. Provision was also required for either ‘up-for-up’ or ‘up-for-down’ gear shift patterns, with the minimum of special-to-option parts. Within these demanding spatial and functional requirements, the design produced is not materially heavier and has greater load capacity than the current four speed gearbox. The four speed + reverse variant utilises the same major castings and has all but a few components common or very similar to the parent five speed gearbox.