SHIMANO Square Type Bicycle Bottom Bracket - BSA 73MM, Spindle: 122.5MM (LL123) - EBBUN300C23X

• 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.

Enhance Your Bicycle's Performance with the BB-UN300 Square Taper JIS Bottom Bracket Optimize your ride with the BB-UN300 Square Taper JIS Bottom Bracket, a reliable and component designed for seamless compatibility with JIS square-taper cranksets. Built with durability and precision in mind, this bottom bracket ensures smooth pedaling efficiency and long-lasting performance for both casual riders and serious cyclists. Materials & Engineering Excellence Constructed from high-grade, corrosion-resistant materials, the BB-UN300 features a hollow spindle that reduces weight without compromising strength. Its robust construction withstands rigorous riding conditions, making it ideal for mountain biking, road cycling, or commuter bikes. The black finish not only offers a sleek, professional look but also provides added protection against rust and wear. Components & Technology This bottom bracket utilizes 's proven JIS square-taper interface, ensuring a secure fit with compatible cranksets. The 73x123mm spindle dimensions deliver optimal leverage and pedaling power. Please note that crankarm fixing bolts are sold separately, allowing you to customize your setup for perfect compatibility. Style & Use Case Designed for BSA (English) threaded shells with a 1.37-inch shell ID, the BB-UN300 is suitable for a wide range of bicycle frames, from mountain bikes to urban commuters. Its simple installation process and standardized design make it a versatile choice for bike shops and DIY enthusiasts seeking reliable bottom bracket performance. Innovative & Differentiating Features With 's commitment to quality and engineering precision, the BB-UN300 stands out for its durable hollow spindle construction and compatibility with a variety of cranksets. Whether you're upgrading your current bike or building a new one, this bottom bracket provides enhanced rotational smoothness, reduced weight, and dependable performance. Key Spec