The Shimano BB-UN300 is a high-quality bottom bracket designed for improved performance and stability while cycling. It features a robust square axle and is equipped with high-quality cartridge bearings that ensure smooth operation and durability. This bottom bracket is available in various mounting types, including standard, E-Type, and chain guard options, to meet the diverse needs of cyclists. The use of aluminum for the adapter materials contributes to weight reduction and overall performance of the bottom bracket. With a shell width of 73 mm and an axle length of 113 mm, the BB-UN300 is versatile and offers excellent frame compatibility. The threaded bearing cups allow for easy installation and maintenance, making it a practical choice for all cyclists.

• High-quality cartridge bearings for improved performance
• Available in standard, E-Type, and chain guard variants
• Robust square axle for increased stability
• Aluminum adapter material for lightweight design
• Easy installation with threaded bearing cups.