SHIMANO UN300 SQUARE TAPER BB Set (Bottom Bracket)

Elevate your drivetrain with Shimano's UN300 bottom bracket, featuring advanced chainline stabilizer technology for superior shifting performance and efficiency.

Key Benefits:

• Integrated chainline stabilizer ensures optimal chain alignment, delivering smoother shifts and reduced drivetrain wear
• Shimano quality cartridge bearing design provides reliable, maintenance-free performance ride after ride
• Durable aluminum adapter material combines lightweight construction with long-lasting strength

Technical Specifications:

• Model: Shimano BB-UN300
• Spindle Type: Square Taper
• Structure Options: Standard, E-type, Chaincase configurations
• Adapter Material: Aluminum
• Type: Cartridge bearing, sealed design

Compatibility:

• Fits standard BB shells with square taper cranks
• Multiple structure options accommodate various frame and drivetrain configurations

Package Contents:

• 1x Shimano UN300 Bottom Bracket (bolt not included)

Important Notes: Crank arm fixing bolts are NOT included—please ensure you have compatible hardware before installation. The chainline stabilizer technology represents a significant upgrade over basic bottom brackets, providing measurably better shifting performance and drivetrain longevity. Professional installation recommended for optimal results.