Shimano Bottom Bracket UN300 Square 68-122.5 BSA

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

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Unleash Maximum Power and Precision in Every Pedal Stroke.

Struggling with unreliable or inefficient bottom brackets? The Shimano UN300 square taper bottom bracket delivers rock-solid durability and seamless power transfer for your ride. Engineered to eliminate creaks and wobble, it ensures your e-bike or traditional setup performs with unmatched smoothness and long-lasting reliability.

Key Features

  • Robust square taper interface for secure crank attachment.
  • Precision bearings that reduce friction and enhance efficiency.
  • Compatible with BSA threaded frames for easy installation.
  • Optimized for 68mm shell width with 122.5mm spindle length.
  • Durable construction designed to withstand urban and off-road conditions.
  • Low maintenance design for hassle-free riding.

Technical Specifications

  • Model: Shimano UN300 bottom bracket / bracketas.
  • Thread type: BSA (British Standard Thread).
  • Shell width: 68 mm.
  • Spindle length: 122.5 mm.
  • Interface: Square taper (Vierkant).
  • Country of origin: Designed for Dutch (D-NL) market compatibility.

Frequently Asked Questions

The Shimano UN300 is designed for square taper cranksets, ensuring compatibility with most standard models using this interface.
It fits frames with a 68mm BSA threaded shell, which is common in many e-bikes and traditional bicycles.

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