---
product_id: 295522317
title: "SHIMANO BB-UN300 bottom bracket British thread, 68-122.5 mm (LL123), silver, One Size, EBBUN300B23X"
brand: "shimano"
price: "$81"
currency: NZD
in_stock: true
reviews_count: 13
category: "Shimano"
url: https://www.desertcart.nz/products/295522317-shimano-bb-un300-bottom-bracket-british-thread-68-122-5
store_origin: NZ
region: New Zealand
---

# Square Taper BSA Spindle 68mm British Thread Shell Sealed Cartridge Bearings SHIMANO BB-UN300 bottom bracket British thread, 68-122.5 mm (LL123), silver, One Size, EBBUN300B23X

**Brand:** shimano
**Price:** $81
**Availability:** ✅ In Stock

## Summary

> ⚡ Upgrade your ride with silent power and pro-grade durability!

## Quick Answers

- **What is this?** SHIMANO BB-UN300 bottom bracket British thread, 68-122.5 mm (LL123), silver, One Size, EBBUN300B23X by shimano
- **How much does it cost?** $81 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.nz](https://www.desertcart.nz/products/295522317-shimano-bb-un300-bottom-bracket-british-thread-68-122-5)

## Best For

- shimano enthusiasts

## Why This Product

- Trusted shimano brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Built to Endure:** Durable sealed cartridge design resists dirt, mud, and water for long-lasting performance.
- • **Streamlined Design:** Narrow body allows clean cable routing for a sleek, professional bike build.
- • **Effortless Installation:** Fast, no-adjustment setup gets you riding sooner with minimal hassle.
- • **Trusted Shimano Quality:** Elevate your ride with a bottom bracket favored by cycling pros and enthusiasts alike.
- • **Precision Engineered Smoothness:** Super-accurate bearings deliver whisper-quiet, frictionless pedaling.

## Overview

The SHIMANO BB-UN300 is a high-quality, maintenance-free bottom bracket featuring a 68mm British threaded shell and a square taper BSA spindle. Its sealed cartridge bearings ensure smooth, silent operation while protecting against dirt and moisture, making it ideal for traditional chainsets and e-bikes alike. Designed for easy installation and optimized cable clearance, this bottom bracket offers exceptional value and reliability for serious cyclists.

## Description

A good quality bottom bracket for traditional chainsets Super-accurate bearings for smooth operation and improved durability Durable, hard-wearing sealed cartridge bottom bracket with square tapered spindle fitting Maintenance-free sealed cartridge bearing assembly keeps out dirt, mud, and water for long bearing life Fast and easy installation without adjustment Narrow body allows clearance for cable routing under the bottom bracket

Review: Smooth and silent (Lasted for two years) - This bottom bracket is for my e bike which I use pedal assist on extensively. As it's a legal 250W motor I have to put in a bit of personal oomph, especially on hills so the mechanics of the bike are very important. The bracket on the bike in comparison (Chinese bike) was a loud mess although it's rotation was adequate and would have lasted longer, however eyeing the corrosion evident on it, decided to replace the bracket and I'm so glad I did. The Shimano one is silent and very smooth with excellent build quality. I've been gradually replacing the original parts on the bike with more upmarket replacements as time goes on and it'll last for many years as a result. This bottom bracket is very good value for money and raises the bar quite a bit compared to the lousy original part. It didn't last for many years as hoped, just a little under two years. Bearings corroded on chainring side. Disintegrated with complete collapse on one side. Having said that, I've replaced with this item again. It did run well up until the failure point, it's reasonable price for two years of constant use won't break the bank.
Review: Sorted - Good quality, easy to fit. All nasty noises and movement gone.

## Features

- 68mm Threaded Shell
- BC 1.37
- Square Taper, BSA

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B08C75T4B4 |
| Batteries included? | No |
| Best Sellers Rank | 11,625 in Sports & Outdoors ( See Top 100 in Sports & Outdoors ) 7 in Bottom Brackets for Bikes |
| Brand | SHIMANO |
| Color | Black |
| Customer Reviews | 4.5 4.5 out of 5 stars (226) |
| Date First Available | 30 May 2020 |
| Department | Unisex |
| Height | 5 centimetres |
| Included components | Bottom Brackets |
| Item display length | 17 centimetres |
| Item display width | 5 centimetres |
| Item model number | EBBUN300B23X |
| Manufacturer | Shimano |
| Material type | Plastic |
| Outer material | Synthetic |
| Size | One Size |
| Weight | 0.4 Kilograms |

## Images

![SHIMANO BB-UN300 bottom bracket British thread, 68-122.5 mm (LL123), silver, One Size, EBBUN300B23X - Image 1](https://m.media-amazon.com/images/I/41Hg-aQl3KL.jpg)

## Customer Reviews

### ⭐⭐⭐⭐⭐ Smooth and silent (Lasted for two years)
*by D***I on 26 October 2022*

This bottom bracket is for my e bike which I use pedal assist on extensively. As it's a legal 250W motor I have to put in a bit of personal oomph, especially on hills so the mechanics of the bike are very important. The bracket on the bike in comparison (Chinese bike) was a loud mess although it's rotation was adequate and would have lasted longer, however eyeing the corrosion evident on it, decided to replace the bracket and I'm so glad I did. The Shimano one is silent and very smooth with excellent build quality. I've been gradually replacing the original parts on the bike with more upmarket replacements as time goes on and it'll last for many years as a result. This bottom bracket is very good value for money and raises the bar quite a bit compared to the lousy original part. It didn't last for many years as hoped, just a little under two years. Bearings corroded on chainring side. Disintegrated with complete collapse on one side. Having said that, I've replaced with this item again. It did run well up until the failure point, it's reasonable price for two years of constant use won't break the bank.

### ⭐⭐⭐⭐⭐ Sorted
*by P***S on 14 October 2024*

Good quality, easy to fit. All nasty noises and movement gone.

### ⭐⭐⭐⭐⭐ Excellent
*by D***R on 13 February 2025*

Excellent Shimano quality, exactly as expected really.

## Frequently Bought Together

- SHIMANO BB-UN300 bottom bracket British thread, 68-122.5 mm (LL123), silver, One Size, EBBUN300B23X
- Shimano HG40 116 W/CL Chain - Grey, 6/7/8 Speed
- Bicycle Crank Extractor Puller, Bike Crank Puller Tool Set, Bottom Bracket Remover, 16mm Wrench Spanner Set, Bicycle Removal Repair Tool for Mountain Bike Bicycle MTB Square Threaded Crankset

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*Product available on Desertcart New Zealand*
*Store origin: NZ*
*Last updated: 2026-03-07*