Cream Machine: 1930 “Ivory” Calthorpe

Clive Curry needed a motorcycle built before 1936 for a regularity run. He found one in a 1930 Ivory Calthorpe.


1930 "Ivory" Calthorpe 350

Engine: 348cc air-cooled OHV single with twin exhaust ports, 74mm x 81mm bore and stroke
Top Speed: 67mph (approx.)
Carburetion: Single Amac TT (stock), Amal 276 fitted
Transmission: Burman 3-speed gearbox, handshift, chain final drive
Electrics: 6v, BT-H magneto
Frame: Dual downtube cradle frame
Suspension: Druid girder fork front, rigid rear
Brakes: 6in internal expanding drum front and rear
Tires: 26 x 3.25in front and rear
Weight: 320lb (est.)
Fuel Capacity: 2.25gal Imperial (2.7gal. U.S.)
Price Then: £47 (1930)

Clive Curry had always wanted to participate in the Durban-Johannesburg trial, a regularity run in his native South Africa. But he lacked one essential ingredient: a motorcycle built before 1936, as the rules stipulate.

The “DJ” as it’s known, is no longer a race as it was from 1913 to 1936. Instead, riders must arrive at each checkpoint as close as possible to a specified time, in the style of the modern Motogiro d’Italia or the resurrected Milano-Taranto run. This is the story of how Curry acquired what is perhaps the perfect motorcycle for the DJ: a 1930 “Ivory” Calthorpe 350.


The Calthorpe

In taking any product to market, one of the most powerful ways to boost sales or justify a higher price is to offer a Unique Selling Preposition — or USP. It’s the feature or benefit that makes your product or service stand out from the crowd. For example, if you’re the car rental company that will “pick you up” from your home or office, that’s your USP. For many years, Royal Enfield’s neutral-finder gearbox was an important USP.

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