The Shimano Bottom Bracket BB-UN300 is a high-quality bottom bracket designed for reliable performance and stability while cycling. With a shell width of 73 mm and an axle length of 122.5 mm, it offers an optimal fit for various bike frames. The square axle allows for easy installation and compatibility with a wide range of chainrings. The bottom bracket is equipped with high-quality cartridge bearings that ensure improved chain stability and increase pedaling efficiency. The product features a simple, solid color design and is made from robust aluminum, making it both lightweight and durable. The BB-UN300 is ideal for cyclists who value performance and reliability and prefer easy installation.

• High-quality cartridge bearings for enhanced performance
• Compatible with BSA frames and square axles
• Easy installation through screwed bearing cups
• Lightweight and durable aluminum material
• Optimal chain stability through integrated stabilizer.