Sales at his Eicher Motors, maker of the vintage Royal Enfield motorbike, have been growing at a scorching pace, even through last year's auto slump. The company has sold 1.9 million bikes this year until August, clocking an 81 percent rise, but still has an order backlog of six months for some models. Son Siddhartha, who runs the company is gearing up for a global ride with new mid-sized models and a new factory in Chennai, site of its oldest plant. Eicher recently hired a senior executive from Harley Davidson to head its US operations.