THE SPECIALIST
For years, Rupert Ratio has helped BSA owners with his encyclopaedic knowledge of BSA’s unit singles. For those sufficiently interested, much of that wisdom is recorded in a trilogy of books on the topic, all available from his company, Ratio Publishing. We are grateful that he could take time from his various projects to assist with this guide.
■ Ratio Publishing: ratiopublishing@gmail.com; www.ratiopublishing.co.uk
MODEL HISTORY
An intense period of development had seen BSA’s competition department turn the cooking, learner-friendly, 250cc C15 into a bike capable of beating the best in the world in 500cc motocross. In 1965, BSA announced 441cc unit-construction singles for the 1966 catalogue. One option was the Victor GP, an off-road competition machine based on the works machinery on which factory riders
