Engine of progress WHEN the covers come off the Vanguard Roadster at the New York Motorcycle show on December 9th the moment will mark the launch not only of a brawny new bike but also of a new brand with big ambitions. Vanguard is an audacious startup that reckons it can use the increasing digitisation of manufacturing to ride with the pack of long-established bike companies, such as Honda, Yamaha, Harley-Davidson, BMW and others, who are together set to sell some 500,000 motorcycles and scooters in America this year. That might sound laughable.