---
product_id: 368985673
title: "Tannus Armour Tire Insert, No Flat Bike Tire Liner, Puncture Proof Bicycle Tube Protector, Stops Flats from Thorns and Goatheads Compatible with E-Bikes, Mountain Bikes, and More 20\" x 3.0-4.0\""
brand: "tannus"
price: "R$46"
currency: BRL
in_stock: false
reviews_count: 5
url: https://www.desertcart.com.br/products/368985673-tannus-armour-tire-insert-no-flat-bike-tire-liner-puncture
store_origin: BR
region: Brazil
---

# Tool-free, instant install Only 380g lightweight foam 15mm max puncture protection Tannus Armour Tire Insert, No Flat Bike Tire Liner, Puncture Proof Bicycle Tube Protector, Stops Flats from Thorns and Goatheads Compatible with E-Bikes, Mountain Bikes, and More 20" x 3.0-4.0"

**Brand:** tannus
**Price:** R$46
**Availability:** ❌ Out of Stock

## Summary

> 🛡️ Ride fearless, ride flat-free — the ultimate tire armor for unstoppable cyclists!

## Quick Answers

- **What is this?** Tannus Armour Tire Insert, No Flat Bike Tire Liner, Puncture Proof Bicycle Tube Protector, Stops Flats from Thorns and Goatheads Compatible with E-Bikes, Mountain Bikes, and More 20" x 3.0-4.0" by tannus
- **How much does it cost?** R$46 with free shipping
- **Is it available?** Currently out of stock
- **Where can I buy it?** [www.desertcart.com.br](https://www.desertcart.com.br/products/368985673-tannus-armour-tire-insert-no-flat-bike-tire-liner-puncture)

## Best For

- tannus enthusiasts

## Why This Product

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

## Key Features

- • **Effortless Setup:** No tools, no hassle—install between tire and tube in minutes and get back on the road.
- • **Ride Smooth & Silent:** Enjoy superior shock absorption, enhanced grip, and low rolling resistance for a comfortable commute.
- • **Featherlight Yet Durable:** At just 380g, this high-tech polymer insert keeps your bike agile without compromise.
- • **Unmatched Puncture Defense:** Patented Aither 1.1 foam shields your ride from thorns and goatheads with up to 15mm thickness.
- • **Adaptive Air Pressure Support:** Armor adjusts thickness dynamically, preventing tire deformation and letting you ride safely even with low pressure.

## Overview

The Tannus Armour Tire Insert is a lightweight, reusable, and recyclable high-tech polymer foam liner designed to prevent flats by providing up to 15mm of puncture protection. Compatible with 20" x 3.0-4.0" tires on mountain and e-bikes, it installs tool-free between tire and tube, offering superior shock absorption, grip, and adaptive support that maintains tire shape even at low air pressure.

## Description

The effective puncture protection system TANNUS Armor offers all-round protection against punctures, cuts and bruises! The system is installed very easily and without tools between tires (free choice of tires and tread pattern!) and tube. The outside of the hose is thus enclosed and thus protected. At the thickest point the puncture protection has a thickness of 15 mm, on the sides and in the rim area 2 mm. Depending on the tire pressure, the Tannus Armour changes its density and the thickness adjusts. If the air pressure drops, the Armour still acts against deformation and still offers high grip and low rolling resistance. It is therefore possible to continue driving at a reduced speed even if the hose is defective. The special high-tech polymer foam also provides good shock absorption while driving and the material is very light and recyclable. Another plus point is the reusability.

## Features

- Made of very light high-tech polymer foam - patented Aither 1.1 technology
- Very light weight, reusable and recyclable
- Very simple and tool-free installation between bicycle tires and bicycle tubes
- Quiet and comfortable driving experience - good shock absorption, good grip and low rolling resistance
- Support for the entire tire: at low air pressure, the Armor acts against deformation and at higher pressure it adjusts its thickness

## Technical Specifications

| Specification | Value |
|---------------|-------|
| Bike Type | Mountain Bike |
| Size | 20" x 3.0-4.0" |
| Material Type | Rubber |
| Batteries Included? | No |
| Brand | Tannus |
| Manufacturer | Tannus |
| Item model number | 20 x 3.0-4.0 |
| Product Dimensions | 50.8 x 10.16 x 50.8 cm; 380 g |
| ASIN | B0973LTJ7X |

## Product Details

- **Brand:** Tannus
- **Tyre type:** Clincher
- **Item width:** 4 Inches
- **Bike type:** Mountain Bike
- **Warranty type:** Limited

## Images

![Tannus Armour Tire Insert, No Flat Bike Tire Liner, Puncture Proof Bicycle Tube Protector, Stops Flats from Thorns and Goatheads Compatible with E-Bikes, Mountain Bikes, and More 20" x 3.0-4.0" - Image 1](https://m.media-amazon.com/images/I/513JWzklj0L.jpg)
![Tannus Armour Tire Insert, No Flat Bike Tire Liner, Puncture Proof Bicycle Tube Protector, Stops Flats from Thorns and Goatheads Compatible with E-Bikes, Mountain Bikes, and More 20" x 3.0-4.0" - Image 2](https://m.media-amazon.com/images/I/91eQFVvz5wL.jpg)
![Tannus Armour Tire Insert, No Flat Bike Tire Liner, Puncture Proof Bicycle Tube Protector, Stops Flats from Thorns and Goatheads Compatible with E-Bikes, Mountain Bikes, and More 20" x 3.0-4.0" - Image 3](https://m.media-amazon.com/images/I/71H93jpH8OL.jpg)
![Tannus Armour Tire Insert, No Flat Bike Tire Liner, Puncture Proof Bicycle Tube Protector, Stops Flats from Thorns and Goatheads Compatible with E-Bikes, Mountain Bikes, and More 20" x 3.0-4.0" - Image 4](https://m.media-amazon.com/images/I/61XO1W+VClL.jpg)
![Tannus Armour Tire Insert, No Flat Bike Tire Liner, Puncture Proof Bicycle Tube Protector, Stops Flats from Thorns and Goatheads Compatible with E-Bikes, Mountain Bikes, and More 20" x 3.0-4.0" - Image 5](https://m.media-amazon.com/images/I/61zXD6KdIKL.jpg)

## Customer Reviews

### ⭐⭐⭐⭐⭐ 







  
  
    Must have for e-bikes
  

*by M***L on Reviewed in the United States on 18 April 2024*

This insert has performed very well in the month I’ve had it. In the 6 months I’ve had my bike I’ve had at least 7 flats and most were from little pieces of metal from the street cleaners bristles and small glass shards. All would barely break through the tire but with the weight on the back tire they’d cause a flat. Always the back; insert angry face!!The second day it was in I pulled a staple that went straight into the tire out and the day after that a 3/4” finishing nail that went in at a slight angle. Neither punctured the tube and what I would’ve spent on replacement tubes has already covered a decent portion of the cost of this. I can still find glass shards and fine metal pieces but I’ve stopped even looking after seeing it take the nail and not go flat.I’ve seen reviews about this not having instructions and that’s wrong. They’re literally embossed on the side of the insert. It’s a few simple steps; deflate tube, clean insert, put insert into tire, tire on bike, re-inflate. But honestly if you need more that that you probably shouldn’t be working on your own bike imho. The only thing that wasn’t stated was that you may have to trim this if your size falls within a range like mine 3-4” insert for a 3” tire, but that’s kinda common sense and if you held the insert against your tire without trimming you’d see it’s way over sized. For this I put the whole insert into the tire, traced where it touched the edge of the tire and then cut 1/8” inside that line to give the tire bead space to seat in the rim. Like magic the amount I cut off was very close to 1”Lastly I’d like to point out something about sizing. The 20x3” tube I first put on which is my bikes size was too big. I felt this as I put it on. There’s just too much rubber when this insert takes up 1/3 of the space in the tire. I did my best to stretch it out and have it fit smoothly in the tire but there seemed to always be a spot it bunched. Plus I couldn’t really pump more than 20psi into the tire despite the bike calling for a min of 24. I should’ve trusted my instincts but recall reading another review saying someone was a clown for saying you need to size the tube down. Well last week I got a flat, was still able to ride to a safe place to change as the insert doesn’t put your rim on the road and the flat was caused by a small pinch in the tube. Not even against the rim just a tiny fold in the center of the tube where it sat in the insert. I got the next partial size tube smaller; 2.75-3.3” and it fits much better and took the correct psi.

### ⭐⭐⭐⭐⭐ 







  
  
    So far so good
  

*by B***R on Reviewed in Canada on 1 April 2024*

My ebike has 20x4 tire and I've had three Flats on the rear. A bit of research later an I picked up some Tannus Armour and some Slimed. I installed it on my rear tire in under an hour, not too hard if you follow the instructions, and so far so good after 3 weeks.

### ⭐⭐⭐⭐⭐ 







  
  
    Good product.
  

*by C***H on Reviewed in Canada on 28 May 2023*

I have used this product before and am happy and have not had a flat thus far. First Bike had for a year and never had a problem. Second Bike just installed tannis liner so hope I get same results.

## Frequently Bought Together

- Tannus Armour Tire Insert, No Flat Bike Tire Liner, Puncture Proof Bicycle Tube Protector, Stops Flats from Thorns and Goatheads Compatible with E-Bikes, Mountain Bikes, and More
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**Shop now:** [https://www.desertcart.com.br/products/368985673-tannus-armour-tire-insert-no-flat-bike-tire-liner-puncture](https://www.desertcart.com.br/products/368985673-tannus-armour-tire-insert-no-flat-bike-tire-liner-puncture)

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*Product available on Desertcart Brazil*
*Store origin: BR*
*Last updated: 2026-01-26*