Shimano Bottom Bracket UN300 Square 73-113 BSA

Precision-engineered square taper design boosts your pedaling efficiency and durability, powered by Shimano’s trusted UN300 tech

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Unleash Seamless Power Transfer with Precision Engineering.

Struggling with inefficient pedaling and unreliable crank performance? The Shimano UN300 square taper bottom bracket delivers rock-solid stability and smooth rotation for your e-mobility ride. Designed to eliminate creaks and wobble, it ensures maximum energy transfer and durability on every journey.

Key Features

  • Robust square taper interface for secure crank attachment.
  • Optimized spindle length (73-113 mm) for versatile bike compatibility.
  • Standard BSA threading for easy installation and maintenance.
  • High-quality Shimano craftsmanship ensuring long-lasting performance.
  • Low friction bearings for smooth and efficient pedaling.

Technical Specifications

  • Type: Shimano bottom bracket (trapas/bracketas)
  • Spindle length: 73-113 mm
  • Threading: BSA (British Standard)
  • Interface: Square taper

Frequently Asked Questions

It fits most bikes with a BSA threaded shell and square taper crank interface, especially those requiring spindle lengths between 73 and 113 mm.
Installation requires a BSA bottom bracket tool and proper torque settings; professional installation is recommended for optimal performance.

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