The Shimano Ultegra SM-BB71-41B Press-Fit Bottom Bracket is engineered for seamless integration with a wide range of Shimano groupsets, including Ultegra, 105, Tiagra, and RS500 cranksets. It’s the perfect choice for road, cyclocross, and equivalent bikes. Precision Fit for Performance: Designed for frames with an 86.5 mm case width, this bottom bracket supports Hollowtech II cranksets with a 24 mm axle. Its press-fit installation ensures a secure connection and optimized power transfer for efficient cycling. Lightweight and Durable Construction: Crafted from high-quality synthetic materials, the SM-BB71-41B is lightweight yet robust. Its black bearing cups are designed to deliver smooth operation and longevity, even under demanding conditions. Enhanced for Older Systems: Ideal for older 10-speed road and cyclocross setups, this bottom bracket provides reliable performance and smooth crank rotation, breathing new life into your bike. With Shimano’s trusted engineering, the SM-BB71-41B offers consistent, high-performance operation, making it a valuable upgrade for cyclists seeking durability and efficiency on every ride.