---
product_id: 316243044
title: "YUNSCM 2-PCS 20x4 Heavy Duty Fat Tire Tubes Schrader Valve Premium Butyl Rubber 20 Bike Tubes Compatible with 20x3.5/4.0 89/102-406 E-Bike/Mountain Bike/Street Bike Bicycle Tire Tubes"
brand: "yunscm"
price: "R$658"
currency: BRL
in_stock: true
reviews_count: 8
url: https://www.desertcart.com.br/products/316243044-yunscm-2-pcs-20x4-heavy-duty-fat-tire-tubes-schrader
store_origin: BR
region: Brazil
---

# 6-9 months air retention 40% thicker butyl rubber 20"x4.0" perfect fit YUNSCM 2-PCS 20x4 Heavy Duty Fat Tire Tubes Schrader Valve Premium Butyl Rubber 20 Bike Tubes Compatible with 20x3.5/4.0 89/102-406 E-Bike/Mountain Bike/Street Bike Bicycle Tire Tubes

**Brand:** yunscm
**Price:** R$658
**Availability:** ✅ In Stock

## Summary

> 🚀 Upgrade your ride with unstoppable air power!

## Quick Answers

- **What is this?** YUNSCM 2-PCS 20x4 Heavy Duty Fat Tire Tubes Schrader Valve Premium Butyl Rubber 20 Bike Tubes Compatible with 20x3.5/4.0 89/102-406 E-Bike/Mountain Bike/Street Bike Bicycle Tire Tubes by yunscm
- **How much does it cost?** R$658 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.com.br](https://www.desertcart.com.br/products/316243044-yunscm-2-pcs-20x4-heavy-duty-fat-tire-tubes-schrader)

## Best For

- yunscm enthusiasts

## Why This Product

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

## Key Features

- • **Built for the Bold:** Heavy-duty 20"x3.5/4.0 size engineered for e-bikes and fat tires—ride wider, ride stronger.
- • **Unmatched Durability:** 40% thicker butyl rubber boosts puncture resistance and slashes replacement frequency.
- • **Smooth Ride Guaranteed:** Superior shock absorption reduces road vibrations for a comfortable, confident commute.
- • **Effortless Installation:** Designed with Schrader valve and easy-fit sizing for quick tube swaps—get back on the road fast.
- • **Stay Inflated, Stay Ahead:** Air tightness improved by 200%, maintaining optimal tire pressure for up to 9 months.

## Overview

YUNSCM’s 20x3.5/4.0 heavy-duty fat tire tubes feature premium butyl rubber that’s 40% thicker than standard tubes, delivering 200% better air retention and puncture resistance. Compatible with e-bikes, mountain, and street bikes, these tubes ensure a smooth, durable ride with up to 9 months of stable tire pressure, reducing maintenance and boosting your cycling confidence.

## Description

Full description not available

## Features

- Designed for E-bike 20 "X4.0" Heavy Duty inner tubes: 20"x3.5/4.0 (89/102-406) Schrader Valve heavy-duty fat inner tube, we design the most suitable thick inner tube for e-bike according to the demand, which can easily meet the demand of 20"x4.0". In fact, its width can be extended to 5.0"+, in order to ensure quality, we conservatively used in the 3.5/4.0 range to ensure its life and air tightness, and reduce the frequency of wear and replacement.
- HEAVY DUTY - Air Tightness: Using high elasticity and high quality butyl rubber and EPDM rubber, the thickness is increased by 40%, and the air tightness of the inner tube is increased by 200% than that of the ordinary butyl inner tube; After inflation, the tire can maintain a higher air pressure for 6-9 months, greatly reducing the inflation frequency. Good air tightness helps keep tire pressure stable, thus improving driving safety.
- HEAVY DUTY- Ultra Durable: Our heavy duty inner tubes have higher puncture resistance than ordinary inner tubes, and the thicker body can withstand more friction and wear, thus extending the service life of the tube, reducing replacement frequency and maintenance costs. And in long-term use.
- Excellent shock absorption ability: The heavy, strong, highly durable butyl rubber made from these inner tubes is a perfect shock absorber to reduce vibration and eliminate the shock caused by bumps and rough surfaces on the road or pavement. Heavy Duty butyl rubber for maximum ride comfort - upgrade your ride experience.
- Installation: 20''x3.5''/4.0" bicycle heavy duty replacement inner tube for easy installation and removal. Check the valve position to ensure that the installation direction is correct.
- This heavy duty inner tube is compatible with the corresponding models of mountain bikes, road bikes, Cruiser bikes, electric bikes; At the same time, the increase in thickness can meet the needs of the longer driving range and load of the prevailing electric bicycles.
- Tip: Before installing the inner tube, please put the inner tube into the water for inspection, if there are bubbles, it means that it has been damaged, you can contact us. Check the valve position to ensure that the installation direction is correct. Note: The inflatable inner tube should avoid puncture by sharp objects.

## Technical Specifications

| Specification | Value |
|---------------|-------|
| Brand | YunSCM |
| Valve Type | Schrader |
| Material | Butyl Rubber |
| Wheel Size | 20 Inches |
| Item Diameter | 4 Inches |
| Item Width | 4 Inches |
| UPC | 750139075553 |
| Compatible Tire Width Minimum | 3.5 Inches |
| Valve Length | 1.57 Inches |
| Item Weight | 0.97 Kilograms |
| Manufacturer | YunSCM20210306120 |
| Size | 20x3.5/4.0 |
| Compatible Tire Width Maximum | 4 Inches |
| Item Package Dimensions L x W x H | 9.96 x 6.26 x 3.15 inches |
| Package Weight | 0.97 Kilograms |
| Item Dimensions  LxWxH | 3.15 x 2.76 x 1.18 inches |
| Brand Name | YunSCM |
| Model Name | 20x3.5/4.0 |
| Color | 20x3.50/4.0 89/102-406 |
| Suggested Users | unisex |
| Part Number | YunSCM20210306120 |
| Model Year | 2022 |
| Style | Riding |

## Product Details

- **Brand:** YunSCM
- **Valve Type:** Schrader
- **Material:** Butyl Rubber
- **Wheel Size:** 20 Inches
- **Item Diameter:** 4 Inches

## Images

![YUNSCM 2-PCS 20x4 Heavy Duty Fat Tire Tubes Schrader Valve Premium Butyl Rubber 20 Bike Tubes Compatible with 20x3.5/4.0 89/102-406 E-Bike/Mountain Bike/Street Bike Bicycle Tire Tubes - Image 1](https://m.media-amazon.com/images/I/71p23hT+lqL.jpg)
![YUNSCM 2-PCS 20x4 Heavy Duty Fat Tire Tubes Schrader Valve Premium Butyl Rubber 20 Bike Tubes Compatible with 20x3.5/4.0 89/102-406 E-Bike/Mountain Bike/Street Bike Bicycle Tire Tubes - Image 2](https://m.media-amazon.com/images/I/513jWB6UXML.jpg)
![YUNSCM 2-PCS 20x4 Heavy Duty Fat Tire Tubes Schrader Valve Premium Butyl Rubber 20 Bike Tubes Compatible with 20x3.5/4.0 89/102-406 E-Bike/Mountain Bike/Street Bike Bicycle Tire Tubes - Image 3](https://m.media-amazon.com/images/I/61OrgfMQUBL.jpg)
![YUNSCM 2-PCS 20x4 Heavy Duty Fat Tire Tubes Schrader Valve Premium Butyl Rubber 20 Bike Tubes Compatible with 20x3.5/4.0 89/102-406 E-Bike/Mountain Bike/Street Bike Bicycle Tire Tubes - Image 4](https://m.media-amazon.com/images/I/61orbAHuVqL.jpg)
![YUNSCM 2-PCS 20x4 Heavy Duty Fat Tire Tubes Schrader Valve Premium Butyl Rubber 20 Bike Tubes Compatible with 20x3.5/4.0 89/102-406 E-Bike/Mountain Bike/Street Bike Bicycle Tire Tubes - Image 5](https://m.media-amazon.com/images/I/61yiBOOrv1L.jpg)

## Customer Reviews

### ⭐⭐⭐⭐⭐ Fit as advertised, and heavy duty too!
*by U***4 on March 1, 2025*

These were advertised as "heavy duty" 20x4 inner tubes. When I opened the box and took one out, I was very pleased at its heft and weight. It was much weightier than the tubes that the bike came with (that kept getting punctures!) I had had several flats in the front and finally one on the rear that I could not repair (it was pretty big!) So, in searching for hefty tubes, I found at least one other brand at a higher price point and read a few of the reviews. I went back to the "Amazon Choice" that had come up earlier and am glad I made that choice! They fit fine and were easy enough to install. I mean to say, it's changing a tube on a bike, something that I had done many times when I was young! I was pretty worried about these, if they would hold up, if they were heavy, heavy duty enough for the type of riding I do! Well, so far, I've put about twenty miles on them over the same graveled and muddy road surfaces that blew out the first ones after about a mile or two. No punctures to report. Well, not yet anyways. Only time and continued riding around the graveled and muddy trails will tell on that! I'm glad I got them is the bottom line. They fit fine, seem to be heavy duty enough, and were easy enough to install.

### ⭐⭐⭐⭐⭐ Excellent Replacement
*by G***Y on October 7, 2024*

A grand replacement that hasn't failed me yet! Feels just like the one that came with my e-bike. My previous one had unfortunately popped a while back, and although it was difficult to install (through no fault of the tire's, just how the engine and wires wrapped around the wheel), it appears to be doing a good job of lengthening the time before I have to do that again! Huge plus in my book!

### ⭐⭐⭐⭐ New
*by D***1 on November 11, 2024*

Well when I first opened package I could feel it was thicker rubber. It fit really good and is holding up pretty good not bad for 2 tubes for the price

## Frequently Bought Together

- 2-PCS 20x4 Heavy Duty E-Bike Tubes 20X4.0 AV32mm (89/102-406) Inner Tubes 20" x 4.0" Compatible with 20x3.5/4.0 E-Bike Bicycle Fat Tire Tubes Schrader Valve
- Ultraverse Fat Tire Liners Tube Protection Against Flats, 20, 24 and 26 inch x 4.0 tire Size, Durable Extruded Plastic Shield for Puncture Free Bike Rides – 2 Pack
- ULTRAVERSE 20x4 E-Bike Fat Tire - Robust, High-Performance 20inch Fat Tyre for MTB and Ebikes, Durable All-Terrain Directional Tread, Superior Density for Street & Trail Adventures-2 Unit

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*Product available on Desertcart Brazil*
*Store origin: BR*
*Last updated: 2026-01-22*