Shimano Square Type Bicycle Bottom Bracket - BSA 73Mm, Spindle: 122.5Mm (Ll123) - Ebbun300C23X | bottom-bike-brackets-and-accessories

Enhance your bike's performance with the BB-UN300 Square Taper JIS Bottom Bracket - the perfect choice for reliable, smooth power transfer on classic and modern bikes. Designed for durability and efficiency, this bottom bracket features materials and advanced engineering to ensure optimal performance in various cycling conditions. Materials & Construction: Constructed with a precision-machined hollow spindle, the BB-UN300 delivers lightweight strength without sacrificing durability. Its robust build ensures longevity and minimizes wear, making it ideal for everyday riding, commuting, and mountain biking. Performance & Engineering: Engineered for seamless integration with JIS square-taper cranksets, this bottom bracket provides smooth rotation and maximum power efficiency. The hollow spindle design reduces weight while maintaining structural integrity, enhancing overall riding performance. Compatible with a 73mm shell width and a 1.37-inch shell diameter, it fits a range of bicycles with BSA (English) threaded frames. Components & Technology: The BB-UN300 features precision-machined components that guarantee reliable engagement with cranksets. Note that crankarm fixing bolts are sold separately, allowing for versatile installation options. Its durable black finish not only adds a sleek aesthetic but also provides corrosion resistance for extended service life. Style & Use Case: Designed for cyclists seeking a dependable and lightweight bottom bracket, the BB-UN300 is perfect for city commuters, mountain bikers, and touring cyclists. Its classic black color complements any bike style, ensuring both function and form. Innovative Features: The hollow spindle technology minimizes weight without compromising strength, enhancing your riding efficiency. Compatibility with JIS square-taper cranksets and easy installation make it a versatile choice for a wide range of bicycles. Upgrade your bike's bottom bracket with the B

• Optimized for JIS square-taper cranksets, the BB-UN300 Bottom Bracket provides reliable performance and durability for a smooth cycling experience.
• Constructed with a hollow spindle for improved weight savings and enhanced stiffness, boosting pedaling efficiency and power transfer on every ride.
• Designed to fit 73mm wide BSA (English) frames with a 1.37-inch shell ID, ensuring universal compatibility with a wide range of mountain and road bikes.
• Featuring materials and precision engineering, this bottom bracket offers long-lasting corrosion resistance and smooth rotation for demanding cycling conditions.
• Stylish black finish complements any bike setup, making it an ideal choice for both performance-oriented riders and casual cyclists seeking dependable, easy-to-maintain components.