---
product_id: 148013933
title: "Mongoose Legion Kids Freestyle BMX Bike, Intermediate Rider, Boys and Girls Bikes, 20-Inch Wheels, Hi-Ten Steel Frame, Micro Drive 25x9T BMX Gearing"
brand: "mongoose"
price: "A$1668"
currency: AUD
in_stock: true
reviews_count: 8
category: "Mongoose"
url: https://www.desertcart.com.au/products/148013933-mongoose-legion-kids-freestyle-bmx-bike-intermediate-rider-boys-girls
store_origin: AU
region: Australia
---

# 20-inch durable wheels Micro Drive 25x9T BMX gearing Hi-Ten steel frame built to last Mongoose Legion Kids Freestyle BMX Bike, Intermediate Rider, Boys and Girls Bikes, 20-Inch Wheels, Hi-Ten Steel Frame, Micro Drive 25x9T BMX Gearing

**Brand:** mongoose
**Price:** A$1668
**Availability:** ✅ In Stock

## Summary

> 🚀 Own the streets with the Legion L20 — where style meets unstoppable freestyle performance!

## Quick Answers

- **What is this?** Mongoose Legion Kids Freestyle BMX Bike, Intermediate Rider, Boys and Girls Bikes, 20-Inch Wheels, Hi-Ten Steel Frame, Micro Drive 25x9T BMX Gearing by mongoose
- **How much does it cost?** A$1668 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.com.au](https://www.desertcart.com.au/products/148013933-mongoose-legion-kids-freestyle-bmx-bike-intermediate-rider-boys-girls)

## Best For

- mongoose enthusiasts

## Why This Product

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

## Key Features

- • **Precision Control:** Aluminum U-brake and brake levers deliver responsive stopping power for confident riding.
- • **Smooth Power Transfer:** 170mm forged steel cranks paired with a 25T alloy chainring and sealed bearing cassette hub.
- • **Optimized Ride Geometry:** 20.25-inch top tube and 8-inch rise handlebars designed for intermediate riders 4’8”–5’4”.
- • **Street-Ready Durability:** Hi-Ten steel frame and fork engineered for freestyle stunts and everyday toughness.
- • **Quick Assembly & Warranty:** Ships nearly assembled with a 5-year frame warranty and 1-year parts coverage for peace of mind.

## Overview

The Mongoose Legion L20 is a 20-inch freestyle BMX bike tailored for intermediate riders between 4’8” and 5’4”. Featuring a rugged Hi-Ten steel frame, precision aluminum U-brakes, and a high-performance Micro Drive 25x9T drivetrain, it’s built to handle street, park, and dirt riding. Lightweight yet durable, it offers smooth handling with a 20.25-inch top tube and 8-inch rise handlebars. The bike ships mostly assembled and includes a 5-year limited frame warranty, making it a reliable choice for young riders ready to push their freestyle skills.

## Description

For 45 years, Mongoose has been in the dirt, down the trails, and on the ramps. With the Legion Series, Mongoose offers a full line of freestyle BMX bikes for riders of all ages and ability levels. The Legion L20 was designed to be a fully park, street and dirt worthy BMX bike. The Legion L20 features a Hi-Ten steel frame (20.25” top tube), tapered headtube, and removable brake mounts. The L20 Hi-Ten steel 8” rise handlebar and 48mm stem are designed for precision riding, while the wide aluminum single wall 36H rims and 2.3” BMX tires offer grip and durability. The 25x9T gearing with one-piece tubular chromoly 170mm hollow spindle cranks and American loose ball bottom bracket offer a clean, reliable drivetrains. An alloy U-brake with alloy brake levers provide speed control, while the Hi-Ten Steel BMX fork with 1-1/8" threadless steerer and taper leg helps maximize performance. This bike ships ready to be assembled and comes with a 5-year limited warranty on the frame and a 1-year limited warranty on parts.

Review: Great quality bike and light weight - This Legion L20 is the third Mongoose BMX bike I've purchased over the last year, and I've been very happy with all three (Legion LSX, Title Pro, and L20). Assembly was very easy on all three bikes; just need to attach the front wheel, handle bars, and pedals. Took only about 15 mins. You just need to pay attention to the direction of the forks and remember the left pedal will be left-hand threaded. The forks and pedals have stickers denoting front/rear, left/right. Besides adjusting for height and putting air in the tires, there really wasn't any need for fine adjustments (chain tension, brakes, misc. nuts, etc.), as these things are being adjusted correctly from the factory (nice surprise). After reading the negative reviews on this bike and the others mentioned, it seems many of them are related to incorrect user assembly. If you put the forks on backwards or don't put air in the tire, you're going to have problems. The Legion L20 is reasonably light at roughly 25 lbs., easy to ride, and looks great. Note, however, that this is a freestyle bike, and probably not the best choice if you're just looking for a neighborhood cruiser. The crank bracket sits about 1" higher than on a race type BMX bike, making the apex pedal feel too high when in a sitting position. This may not bother some people. If it does, you could buy shorter cranks, but with the money you'd spend, it would be more logical to just go with a race style bike with the lower bracket (and larger front sprocket). The Title series with a lengthened seat post makes for a great lightweight cruiser. Not much to complain about on this bike. Excellent quality for the money. If you're looking for a reasonably priced freestyle bike with good quality, at $156, this is a great choice.
Review: Good bike for the money - All you need are some tools, a brain, some patience and reasonable expectations for this to be put together and on the road. If you have half a brain and basic tools, you’re going to be able to put this together without even looking at the instructions. This will come in a box, front tire packaged off. It comes with no tools, everything zip tied so it could remain intact on the long trip from CHIIIINA to the US. Packaging is solid. There are several thick zip ties to cut to break everything loose. You’re going to need: Metric hex tools A 15 and 18 mm socket for axels 15mm wrench or socket to tighten handlebar alignment Scissors or utility knife for zip ties Phillips screwdriver (for the reflectors only) You’ll need an extension bar to remove the nuts from the axels to install the pegs on front and back. Will take you about 60 seconds to do this. Front handlebars install with hex keys. Honestly not sure how anybody could have problems with this. It’s four bolts. Secure them, and you’re good. But man, some reviewers couldn’t figure this out. Install the seat with another hex socket. Put on the reflectors, hook up the brake, fill the tires with air, and you’re riding. Btw, the factory purposefully ships tires with less air than you’ll need for your benefit. Any tire sitting for an extended period will last longer if not fully inflated. Hooking up the brake is a bit of a pain in the A, as you won’t have enough slack in the front to properly attach the cable unless you briefly disconnect the rear brakes. Once you pull the cable through in the front to attach, reattach the rear. Took me a minute to figure this out. The front break setup is such that you can spin the handlebars around to 1) look cool, and 2) not have the brake line get wound around the front of the bike. The bike is good, solid and worth the money. Assembly, with any mechanical skill (even entry level mechanical skill) will take 20 minutes. Also, warning: you’re buying a $200 bike. It will last like a $200 bike. Many people on here complain about the quality. This isn’t a $1000 bike. Don’t pretend it is. Take care of it, don’t beat it to death and you’ll be good. If this was at all helpful, please hit the button.

## Features

- L20 is a stylish freestyle BMX bike that offers everything a beginning rider needs to hit the streets and pop off curbs, Suggested rider height is 4’8”-5’4”
- Built to last with its Hi-Ten steel frame, removable brake mounts, and a top tube length of 20.25 inches
- Boasts a high-performance drivetrain equipped with 170mm one-piece forged steel cranks, a 25T alloy chainring, and an American loose ball bottom bracket
- Wheelset is equipped with 20” x 2.3” tires mounted on aluminum single wall 36H rims with 3/8” female axle front hub and 9T cog sealed bearing cassette rear hub
- Aluminum U-brake and brake levers provide precision speed control, while the Hi-Ten steel handlebar and fork are joined by a 50mm stem and threadless sealed integrated headset for maximum steering performance

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B07W5KNZZX |
| Additional Features | Aluminum Frame, BMX, freestyle |
| Age Range (Description) | Big Kid |
| Age Range Description | Big Kid |
| Best Sellers Rank | #72,974 in Sports & Outdoors ( See Top 100 in Sports & Outdoors ) #9,736 in Cycling Equipment |
| Bike Type | BMX Bike |
| Brake Style | U Brake |
| Brand | Mongoose |
| Brand Name | Mongoose |
| Color | Grey |
| Customer Reviews | 4.4 out of 5 stars 3,190 Reviews |
| Frame Material Type | High Tensile Steel |
| Global Trade Identification Number | 00038675187184 |
| Included Components | Mongoose Legion L20 Freestyle BMX Bike |
| Is Assembly Required | Yes |
| Item Type Name | BMX Freestyle Bike |
| Item Weight | 12 Kilograms |
| Manufacturer | Pacific Cycle, Inc. |
| Minimum User Height | 48 Inches |
| Model Name | Legion Intermediate |
| Model Number | M41800U20OS-PC |
| Model Year | 2020 |
| Number Of Speeds | 1 |
| Number of Handles | 1 |
| Number of Speeds | 1 |
| Power Source | Pedal power (human energy transferred through a drivetrain) |
| Seat Material | Fabric or Plastic |
| Size | 20-Inch Wheels L20 |
| Skill Level | Intermediate |
| Specific Uses For Product | Trail |
| Style Name | L20 |
| Suspension Type | Rigid |
| UPC | 038675187184 |
| Warranty Description | Limited lifetime warranty on frame and one year warranty on parts |
| Warranty Type | Limited |
| Wheel Material | Aluminum |
| Wheel Size | 20 Inches |

## Product Details

- **Age Range (Description):** Big Kid
- **Bike Type:** BMX Bike
- **Brand:** Mongoose
- **Color:** Grey
- **Frame Material:** High Tensile Steel
- **Included Components:** Mongoose Legion L20 Freestyle BMX Bike
- **Number of Speeds:** 1
- **Special Feature:** Aluminum Frame, BMX, freestyle
- **Suspension Type:** Rigid
- **Wheel Size:** 20 Inches

## Images

![Mongoose Legion Kids Freestyle BMX Bike, Intermediate Rider, Boys and Girls Bikes, 20-Inch Wheels, Hi-Ten Steel Frame, Micro Drive 25x9T BMX Gearing - Image 1](https://m.media-amazon.com/images/I/71DAu43Uj0L.jpg)

## Available Options

This product comes in different **Color, Size** options.

## Customer Reviews

### ⭐⭐⭐⭐⭐ Great quality bike and light weight
*by A***S on October 24, 2020*

This Legion L20 is the third Mongoose BMX bike I've purchased over the last year, and I've been very happy with all three (Legion LSX, Title Pro, and L20). Assembly was very easy on all three bikes; just need to attach the front wheel, handle bars, and pedals. Took only about 15 mins. You just need to pay attention to the direction of the forks and remember the left pedal will be left-hand threaded. The forks and pedals have stickers denoting front/rear, left/right. Besides adjusting for height and putting air in the tires, there really wasn't any need for fine adjustments (chain tension, brakes, misc. nuts, etc.), as these things are being adjusted correctly from the factory (nice surprise). After reading the negative reviews on this bike and the others mentioned, it seems many of them are related to incorrect user assembly. If you put the forks on backwards or don't put air in the tire, you're going to have problems. The Legion L20 is reasonably light at roughly 25 lbs., easy to ride, and looks great. Note, however, that this is a freestyle bike, and probably not the best choice if you're just looking for a neighborhood cruiser. The crank bracket sits about 1" higher than on a race type BMX bike, making the apex pedal feel too high when in a sitting position. This may not bother some people. If it does, you could buy shorter cranks, but with the money you'd spend, it would be more logical to just go with a race style bike with the lower bracket (and larger front sprocket). The Title series with a lengthened seat post makes for a great lightweight cruiser. Not much to complain about on this bike. Excellent quality for the money. If you're looking for a reasonably priced freestyle bike with good quality, at $156, this is a great choice.

### ⭐⭐⭐⭐⭐ Good bike for the money
*by H***T on December 21, 2020*

All you need are some tools, a brain, some patience and reasonable expectations for this to be put together and on the road. If you have half a brain and basic tools, you’re going to be able to put this together without even looking at the instructions. This will come in a box, front tire packaged off. It comes with no tools, everything zip tied so it could remain intact on the long trip from CHIIIINA to the US. Packaging is solid. There are several thick zip ties to cut to break everything loose. You’re going to need: Metric hex tools A 15 and 18 mm socket for axels 15mm wrench or socket to tighten handlebar alignment Scissors or utility knife for zip ties Phillips screwdriver (for the reflectors only) You’ll need an extension bar to remove the nuts from the axels to install the pegs on front and back. Will take you about 60 seconds to do this. Front handlebars install with hex keys. Honestly not sure how anybody could have problems with this. It’s four bolts. Secure them, and you’re good. But man, some reviewers couldn’t figure this out. Install the seat with another hex socket. Put on the reflectors, hook up the brake, fill the tires with air, and you’re riding. Btw, the factory purposefully ships tires with less air than you’ll need for your benefit. Any tire sitting for an extended period will last longer if not fully inflated. Hooking up the brake is a bit of a pain in the A, as you won’t have enough slack in the front to properly attach the cable unless you briefly disconnect the rear brakes. Once you pull the cable through in the front to attach, reattach the rear. Took me a minute to figure this out. The front break setup is such that you can spin the handlebars around to 1) look cool, and 2) not have the brake line get wound around the front of the bike. The bike is good, solid and worth the money. Assembly, with any mechanical skill (even entry level mechanical skill) will take 20 minutes. Also, warning: you’re buying a $200 bike. It will last like a $200 bike. Many people on here complain about the quality. This isn’t a $1000 bike. Don’t pretend it is. Take care of it, don’t beat it to death and you’ll be good. If this was at all helpful, please hit the button.

### ⭐⭐⭐⭐⭐ Best bike around. My 10 Yr Old loves it.. I used to BMX and better than my bikes.
*by J***L on September 23, 2025*

This bike is Amazing. And even though I got it Used it came in Mint Condition still in the Box. Great Seller. My 10 Year old Daughter wanted a good Boys Bike and this one is outstanding. Much better than the Mongoose I had in 1984. I had to pull the handlebars back a little bit for her. Brakes are real good to compared to most that come on the bike. I think if you can get this for under $250. It's a steal.

## Frequently Bought Together

- Mongoose Legion Kids Freestyle BMX Bike, Intermediate Rider, Boys and Girls Bikes, 20-Inch Wheels, Hi-Ten Steel Frame, Micro Drive 25x9T BMX Gearing
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*Product available on Desertcart Australia*
*Store origin: AU*
*Last updated: 2026-03-19*