BB-UN300 BOTTOM BRACKET - 73mm Shell Width

Shimano Cartridge Bearing Square Taper Bottom Bracket

Upgrade your bike with a high-quality Shimano bottom bracket engineered for smooth, reliable performance and long-lasting durability.

Key Features

• Shimano cartridge bearings for smooth rotation and minimal maintenance

• Chainline stabilizer for improved drivetrain alignment and reduced chain wear

• Multiple configurations:

  • Widths: 68 mm & 73 mm

  • Spindle lengths: 107-110-113-115-117-118-122-127 mm

  • Options: Standard, E-type, or compatible with chain cases

• Adapter material: Lightweight, durable aluminum

Benefits

• Enhanced pedaling efficiency and drivetrain stability

• Reduced friction for longer service life

• Broad compatibility with various cranksets and frame setups