---
product_id: 338487625
title: "4Pcs Bike Ball Bearing Retainer Replacement Mountain Bike Parts 1/4 inch x 9 Balls Bicycle Repair Accessories for Kids/Stretch Bicycle MTB Bicycle Ball Bearings Bike Crank Bottom Bracket"
brand: "yunmoxiao"
price: "₩21258"
currency: KRW
in_stock: true
reviews_count: 9
category: "Yunmoxiao"
url: https://www.desertcart.kr/products/338487625-4pcs-bike-ball-bearing-retainer-replacement-mountain-bike-parts-1
store_origin: KR
region: South Korea
---

# 29mm outer diameter 4-piece replacement set 9 precision steel balls 4Pcs Bike Ball Bearing Retainer Replacement Mountain Bike Parts 1/4 inch x 9 Balls Bicycle Repair Accessories for Kids/Stretch Bicycle MTB Bicycle Ball Bearings Bike Crank Bottom Bracket

**Brand:** yunmoxiao
**Price:** ₩21258
**Availability:** ✅ In Stock

## Summary

> 🚴‍♂️ Upgrade your ride with precision that pedals ahead!

## Quick Answers

- **What is this?** 4Pcs Bike Ball Bearing Retainer Replacement Mountain Bike Parts 1/4 inch x 9 Balls Bicycle Repair Accessories for Kids/Stretch Bicycle MTB Bicycle Ball Bearings Bike Crank Bottom Bracket by yunmoxiao
- **How much does it cost?** ₩21258 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.kr](https://www.desertcart.kr/products/338487625-4pcs-bike-ball-bearing-retainer-replacement-mountain-bike-parts-1)

## Best For

- yunmoxiao enthusiasts

## Why This Product

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

## Key Features

- • **Smooth Ride Guaranteed:** 9 perfectly sized 1/4 inch balls reduce friction and eliminate crank noise for seamless pedaling.
- • **DIY Friendly Repair Kit:** Includes 4 retainers—two for immediate replacement, two as spares—empowering you to maintain your bike at home.
- • **ISO 355 Certified Quality:** Manufactured to meet strict ISO standards ensuring reliable, professional-grade bike maintenance.
- • **Universal Fit for MTB & More:** Compatible with mountain, kids, stretch, and lowrider bikes—one set fits all your cycling needs.
- • **Precision Engineered Durability:** Crafted from high-intensity alloy steel for long-lasting performance under pressure.

## Overview

This 4-piece bike ball bearing retainer set features 9 high-quality 1/4 inch steel balls per retainer, designed with a 29mm outer diameter and 18.4mm inner diameter. Made from durable alloy steel and ISO 355 certified, it fits a wide range of bicycles including mountain, kids, and stretch bikes. Ideal for DIY repairs, it ensures smoother crank operation and reduces noise, making it an essential upgrade for cycling enthusiasts.

## Description

Are you looking for bearing repair accessories for your bicycle? This ball bearing retainer repair accessories just designed for you! Dimensions and specifications OUTER DIAMETER: 1.14 inch/29mm, INNER DIAMETER: 0.7 inch/18.4mm, BALL DIAMETER: 1/4 inch. Please confirm the size before purchase!!!!!!! Widely usage: This bearings for bicycle crank, bike crank, lowlander bikes, beach cruiser, limos, stretch bicycles. Every 29mm cage has 9 6.39mm balls. With this ball bearing retainer, you can replace your bike parts by yourself in home. Keep your bike away from abnormal noises, runs more smoothly Perfect supply for bicycle enthusiasts and an essential parts for bike. Note: 1. Apply a small amount of grease before installation。 2. In order to protect the Retainer, it is normal to have a little grease on the Retainer. 3.Please allow 0-1mm error due to manual measurement. Package includes: 4 x Bicycle Ball Bearing Retainer.

Review: Does the job - Works fine on my tricycle bottom bracket.
Review: Working well - Ones that came with the bike quickly became noisy. These replacements, inexpensive though they are, have just worked flawlessly.

## Features

- Material: This ball bearing retainer made of steel, high quality, durable and high intensity.
- Package Include:4 Pieces Bicycle Crank Bearing 1/4" ball size x 9 balls. One pair of crank bearings for replacements, another for spare.
- Bearing Size:OUTSIDE DIAMETER: 1.14 inch/29mm, INSIDE DIAMETER: 0.7 inch/18.4mm, BALL SIZE: 1/4 inch x 9 balls.Please confirm the size before purchase!!!!!!!
- Widely usage: This beads rack for bike parts replacement, suitable for ordinary bicycles, mountain bikes, mongose bicycle, lowrider bike, stretch bicycle, kids bike. Note: If you receive a 6-ball bearing retainer, they are the same product, have the same size and use. It does not affect the use of.Because they are updating iterative relationships.
- Widely usage:This ball bearing retainer for bike parts replacement, suitable for bicycle crank, such as: mountain bike, kids bicycle, lowrider bike,children’s bike, stretch bicycles.

## Technical Specifications

| Specification | Value |
|---------------|-------|
| Manufacturer | Yunmoxiao |
| Item Weight | 40 g |
| Product Dimensions | 3.9 x 2.9 x 2.9 cm; 40 g |
| Material | Alloy Steel |
| Item thickness | 1 Millimetres |
| Specification met | ISO 355 |
| Batteries included? | No |
| Batteries Required? | No |

## Product Details

- **Brand:** Yunmoxiao
- **Material:** Alloy Steel
- **Item dimensions L x W x H:** 39 x 29 x 29 millimetres
- **Item weight:** 40 Grams
- **Bearing number:** 4

## Images

![4Pcs Bike Ball Bearing Retainer Replacement Mountain Bike Parts 1/4 inch x 9 Balls Bicycle Repair Accessories for Kids/Stretch Bicycle MTB Bicycle Ball Bearings Bike Crank Bottom Bracket - Image 1](https://m.media-amazon.com/images/I/61WK5uqfCuS.jpg)

## Customer Reviews

### ⭐⭐⭐⭐⭐ Does the job
*by B***Y on 7 August 2025*

Works fine on my tricycle bottom bracket.

### ⭐⭐⭐⭐⭐ Working well
*by D***F on 3 October 2024*

Ones that came with the bike quickly became noisy. These replacements, inexpensive though they are, have just worked flawlessly.

### ⭐⭐⭐⭐ As advertised.
*by M***E on 5 May 2025*

Rolling rolling, off we go.

## Frequently Bought Together

- 4Pcs Bike Ball Bearing Retainer Replacement Mountain Bike Parts 1/4 inch x 9 Balls Bicycle Repair Accessories for Kids/Stretch Bicycle MTB Bicycle Ball Bearings Bike Crank Bottom Bracket
- Yunmoxiao 4Pcs Bike Ball Bearing Retainer Replacement Mountain Bike Parts 3/16" x 7 Balls Bicycle Repair Accessories for Kids/Stretch Bicycle MTB Bicycle Ball Bearings Bracket Front Wheel
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*Product available on Desertcart South Korea*
*Store origin: KR*
*Last updated: 2026-01-28*