Harley-Davidson is to unveil its first electric motorcycle - a sleek, futuristic bike that hums like a jet airplane taking off.

Harley plans to show handmade demonstration models at an invitation-only event in New York on Monday. The company will then take several dozen riders on a 30-city tour to test drive the bikes and provide feedback.

It will use the information it gathers to refine the bike, which might not hit the market for several more years.

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