Very low mileage The Shimano BB-RS501 68mm English Bottom Bracket Hollowtech II in Silver is a high-quality bottom bracket designed for hybrid/comfort bikes and mountain bikes. Made by the reputable brand Shimano in Malaysia, this bottom bracket features a 68mm shell width and a Hollowtech II spindle interface type for optimal performance. With this durable and reliable component, cyclists can enjoy a smooth and efficient ride on their bicycles.