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Shimano BB-UN300 Bottom Bracket - British thread, 68 - 122.5 mm

Shimano BB-UN300 Bottom Bracket - British thread, 68 - 122.5 mm

SHIMANO quality/performance cartridge bearing square bottom bracket. A good quality bottom bracket...

Best current price£10.95from Tredz

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eBayShimano BB-UN300 Bottom Bracket 73MM X 122.5MM (item as Pictured)
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Product Information

Full details

This guide is for cyclists looking to replace or upgrade their bottom bracket, specifically the Shimano BB-UN300. It offers improved performance and durability for your bike's drivetrain. Note that this specific item has been returned, but is unused and still comes with a full warranty. This bottom bracket features a square taper spindle fitting, a sealed cartridge bearing assembly, and is designed for easy installation and maintenance.

All features

Model Part Number62.78669
BrandSHIMANO

Extended Product Information

FAQs

What tools are required for installation?

You will need a bottom bracket tool designed for square taper bottom brackets and a torque wrench to ensure proper tightening.

What kind of maintenance does this bottom bracket require?

The sealed cartridge design minimizes maintenance. Regular inspection for play or noise is recommended. Replacement may be needed after wear.

Is this bottom bracket compatible with all bikes?

No. It is compatible with bikes that have a 68mm bottom bracket shell and British thread and use a square taper crankset.

What is the lifespan of this bottom bracket?

Lifespan depends on usage and conditions. With proper care, it should last for a reasonable amount of time. Regular inspection is key.

What does 'sealed cartridge' mean?

It means the bearings are sealed within a cartridge, preventing dirt and water from entering and extending the bearing life.

Can I use this bottom bracket with a different crankset?

No, it must be used with a square taper crankset.

Troubleshooting

Cranks feel loose or wobbly.

Check the tightness of the crank bolts and bottom bracket installation. Ensure the bottom bracket is properly tightened to the frame.

Creaking or clicking noises from the bottom bracket area.

Check and re-grease the threads of the bottom bracket and crankset. Tighten the bottom bracket if necessary. It could also indicate that the bearings are worn, and replacement may be needed.

Difficulty pedaling or rough feeling.

Check the bottom bracket for damage or debris. The bearings might be damaged, and the bottom bracket will need to be replaced.

Pros and Cons

Pros

  • Improved drivetrain performance.
  • Longer bearing life due to sealed cartridge design.
  • Easy and quick installation process.
  • Durable and reliable construction.
  • Good value for money.

Cons

  • Square taper design is not as advanced as some other bottom bracket types.
  • Requires compatible square taper cranksets.
  • Limited to the 68mm shell width and 122.5mm length

Setup, Compatibility & Care

Setup:

  1. Ensure your bike frame is compatible with a 68mm bottom bracket shell and British thread.
  2. Use the correct tools for bottom bracket installation. (Tools not included)
  3. Grease the threads before installing to prevent seizing.
  4. Tighten to the manufacturer's recommended torque specifications.

Compatibility:

  • This bottom bracket is compatible with cranksets designed for a square taper spindle interface.
  • It fits frames with a 68mm bottom bracket shell and a British thread.

Care:

  • Avoid using high-pressure water to clean the bottom bracket area.
  • Regularly inspect for any play or unusual noises, indicating wear.
  • If needed, replace the bottom bracket when it shows signs of wear or damage.
  • Although sealed, consider applying a small amount of grease to the threads during installation and maintenance.

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