---
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: "68 Lei"
currency: RON
in_stock: true
reviews_count: 9
category: "Yunmoxiao"
url: https://www.desertcart.ro/products/338487625-4pcs-bike-ball-bearing-retainer-replacement-mountain-bike-parts-1
store_origin: RO
region: Romania
---

# 29mm outer diameter DIY bike crank repair 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:** 68 Lei
**Availability:** ✅ In Stock

## Summary

> 🚴‍♂️ Upgrade your ride with precision and power — don’t let worn bearings slow you down!

## 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?** 68 Lei with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.ro](https://www.desertcart.ro/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

- • **Effortless DIY Upgrade:** Simple installation with a touch of grease lets you maintain your bike like a pro, no mechanic needed.
- • **Perfect Fit Every Time:** 29mm outer diameter and 1/4 inch ball size ensure seamless compatibility with most MTB and kids' bikes.
- • **Smooth Ride Guaranteed:** Reduces crank noise and friction, delivering a whisper-quiet, fluid cycling experience.
- • **Complete Replacement Kit:** Includes 4 retainers—two for immediate use, two as spares to keep you riding without interruption.
- • **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 steel balls per retainer, sized at 29mm outer diameter and 1/4 inch ball diameter, designed for easy replacement of crank bearings on mountain, kids’, and stretch bikes. Engineered for durability and smooth performance, it’s the essential upgrade for cyclists seeking quiet, efficient rides and hassle-free DIY maintenance.

## 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 |
|---------------|-------|
| ASIN | B097H2GF2B |
| Batteries Required? | No |
| Batteries included? | No |
| Best Sellers Rank | 21,690 in Sports & Outdoors ( See Top 100 in Sports & Outdoors ) 1,012 in Bike Components & Parts |
| Customer Reviews | 4.4 4.4 out of 5 stars (158) |
| Date First Available | 18 Jun. 2021 |
| Item Weight | 40 g |
| Item thickness | 1 Millimetres |
| Manufacturer | Yunmoxiao |
| Material | Alloy Steel |
| Product Dimensions | 3.9 x 2.9 x 2.9 cm; 40 g |
| Specification met | ISO 355 |

## Product Details

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

## 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 Romania*
*Store origin: RO*
*Last updated: 2026-02-22*