Royal Enfield is an Indian motorcycle brand that has been in continuous production since 1901. It is the oldest motorcycle brand in the world. Royal Enfield manufactures motorcycles in Chennai, India, including classic models like the Bullet, which holds the record for the longest production run of any motorcycle. In the 1990s, Royal Enfield collaborated with the Eicher Group and merged with them to help expand production. More recently, Royal Enfield has focused on designing new models to attract younger riders and expanding its market, with models now ranging from 350cc to 650cc. It has become the largest selling motorcycle brand in the middleweight segment in India.