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Shimano UN300 BSA 73 mm Square Bottom Bracket

The Shimano UN300 offers smooth, reliable performance for every cyclist.

Frowse Rating9.2/10

Available in multiple variations.

The Shimano UN300 Bottom Bracket offers reliable performance with precision cartridge bearings for enhanced chainline stability. Suitable for various bike configurations, it provides options for standard, E-type, and chain case setups. Constructed with durable aluminium, this bottom bracket is ideal for improving your bike’s drivetrain efficiency.

  • Dimensions: 45 x 144 x 43 mm
  • Available sizes: 68mm x 110mm and 68mm x 113mm
  • Adapter material: Aluminium

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Frowse Rating 9.2/10

Best for: Cyclists seeking reliability and smooth operation

Our Review

The Shimano UN300 English Bottom Bracket exemplifies exceptional quality and performance, making it a solid choice for cyclists seeking reliability and smooth operation. This cartridge bearing design ensures improved chainline stability, which is especially beneficial for those who prioritise efficiency and durability in their cycling experience.

Ideal for a variety of bike setups, the UN300 fits standard 73mm BSA frames and offers ease of installation provided the right tools are on hand. The lightweight aluminium adapter material enhances the overall experience without compromising strength, which is a significant advantage for competitive and casual riders alike.

For cyclists looking for a dependable bottom bracket that enhances their overall ride quality, the Shimano UN300 delivers outstanding performance.

What we like

  • Exceptional quality and performance
  • Improved chainline stability
  • Lightweight aluminium construction
  • Easy installation with proper tools
  • Enhances overall ride quality

Our verdict

The Shimano UN300 offers smooth, reliable performance for every cyclist.

Product Details

The Shimano UN300 Bottom Bracket is designed for BSA 73mm square bike mount configurations. It features a square axle type and comes packaged as the standard bracket, model BB-UN300, which includes a set screw for secure attachment. This bottom bracket supports various structural options including E-type and chain case variations, making it versatile for different cycling needs. The dimensions of this product are 45 mm deep, 144 mm wide, and 43 mm high. Available sizes include 68mm x 110mm and 68mm x 113mm, providing options to suit your bike’s specifications. The adapter construction uses durable aluminium for longevity and performance.
ASIN:
B08C7HJ9BT
Brand:
SHIMANO

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