---
product_id: 148013867
title: "Mongoose Legion Kids Freestyle BMX Bike"
brand: "mongoose"
price: "¥190776"
currency: JPY
in_stock: true
reviews_count: 13
category: "Mongoose"
url: https://www.desertcart.jp/products/148013867-mongoose-legion-kids-freestyle-bmx-bike
store_origin: JP
region: Japan
---

# 20-inch freestyle BMX wheels 2.3-inch wide tires for grip 3-piece chromoly crank for power Mongoose Legion Kids Freestyle BMX Bike

**Brand:** mongoose
**Price:** ¥190776
**Availability:** ✅ In Stock

## Summary

> 🔥 Own the park, street, and block with the Mongoose Legion L20 BMX! 🚲

## Quick Answers

- **What is this?** Mongoose Legion Kids Freestyle BMX Bike by mongoose
- **How much does it cost?** ¥190776 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.jp](https://www.desertcart.jp/products/148013867-mongoose-legion-kids-freestyle-bmx-bike)

## 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

- • **Unmatched Traction:** Wide 2.3-inch tires deliver confident grip on pavement, dirt, and skatepark surfaces—ride with control.
- • **Legacy of Excellence:** From the OGs of BMX, Mongoose brings 50+ years of action sports expertise to your ride.
- • **Durability That Lasts:** 14 mm axle and sealed 9T rear hub built to withstand repeated landings and daily BMX abuse.
- • **Designed for Progression:** Perfectly sized for riders 5'3" to 6'0" stepping up their freestyle game with upgraded components.
- • **Precision Power Transfer:** Lightweight chromoly crank ensures every pedal stroke counts for serious BMX sessions.

## Overview

The Mongoose Legion L20 is a 20-inch freestyle BMX bike engineered for youth riders between 5'3" and 6'0" who are advancing beyond beginner level. Featuring a lightweight 3-piece chromoly crank for efficient power transfer, wide 2.3-inch tires for superior traction on diverse terrains, and a durable 14 mm axle with a sealed 9T rear hub for smooth, long-lasting performance, this bike is built to handle the rigors of park, street, and everyday freestyle riding. Backed by Mongoose’s 50+ years of BMX heritage, the Legion L20 combines quality, durability, and style to help young riders push their limits and master new tricks.

## Description

The Mongoose Legion L20 is a freestyle BMX bike designed for riders progressing beyond the basics and looking to push their skills further. Built for park riding, street sessions, or cruising the block, this 20-inch BMX bike features upgraded components that deliver the durability and performance needed for more demanding riding. Wide 2.3-inch tires provide grip and control on pavement, packed dirt, and skatepark surfaces, while the lightweight 3-piece chromoly crank delivers reliable power transfer and lasting durability. A sealed rear hub provides smooth rolling performance, and the durable 14 mm axle is built to handle repeated landings and long sessions. Whether you're learning new tricks or working on your next line, the Legion L20 is ready to ride. As one of the OGs in BMX and action sports, Mongoose has spent more than 50 years helping riders push limits, learn new tricks, and discover what BMX is all about. The Legion Series delivers freestyle BMX bikes for every stage of progression, from first-time riders to dedicated park and street riders. We've always been about epic rides and pushing limits—and we're just getting started.

Review: Sturdy and well made - Extremely well-made bike. Sturdy and heavy. Mongoose is always a reliable brand. Love the teal color. Highly recommended!
Review: Yes! Mongoose is back to the good stuff!!! - Just get one. This is Mongoose like in the 80's and early 90's. Not the junk crap that Walmart and other department stores still sell. Avoid those like the plague! But then, that's apparent to any real BMX rider. Those are all flash for what little you pay and no real quality. If you already have one of those, strip it down to the bare frame and only the frame and build everything else up from scratch. That's those bikes only hope. This on the other hand is fine the way it comes. Ok, may have to make a few tweaks and whatnot along the way, but that's to be expected of even the best BMX bikes. It's part of riding and making it your own. I do wish they'd have given it at least a somewhat taller seat post, and I'm also not crazy about how the seat is permanently attached to the seat post as well. Normal seat and seat post setup is, if the seat wears out or isn't to your liking, you can just stick a new seat on the seat post. Here, you have to replace both. Was expecting something like a pivoting seat post or perhaps the old bolt down kind. On the other hand, the seat that's here, by BMX standards, is plenty acceptable until I upgrade. I got the L60 and I'm not sure it mentions it in the details, but it appears as though it's sporting a rear wheel that's sealed while the front wheel is not sealed. But the L60 is totally the midrange offering of the whole Legion lineup. So it's expected that a few things are somewhat average, besides, the rear wheel is where you want and need a better quality one at, uh, if you're going to cut corners that is. Also, contrary to what I'm seeing in other reviews here, the brakes do work surprisingly well. More than adequate. The bike arrived perfectly and overall inspection found one very minor blemish. Top tube on left side has like a weird smudge in the paint job that then glossed over for it's final painting. I tried Goo Gone thinking it might have just been grease, it's kind of a blackish color against green giving that effect sorta, but after a good rubbing it remains unchanged, so I can tell it's permanently on there. Both very minor and totally cosmetic, a classic error no doubt the result of being mass produced. Everything else is brilliant here plus I caught a sweet sale on mine and got it for only $146.87 + tax. Arrived quickly, packaged well, everything is in perfect condition, so yeah, I'll excuse one little minor smudge. Thank you Mongoose!!!!

## Features

- STEP UP YOUR GAME: Built for riders 5' 3" to 6' 0" tall who are progressing beyond the basics, this 20-inch freestyle BMX bike delivers upgraded components for park, street, and everyday riding.
- CONFIDENT GRIP: Wide 2.3-inch tires provide confident traction on pavement, park surfaces, and packed dirt. Built to help riders stay planted while building skills and trying something new.
- POWER THROUGH THE SESSION: A lightweight 3-piece chromoly crank delivers reliable power transfer and the durability riders need when tricks, jumps, and ride time start getting more serious.
- UPGRADED WHERE IT COUNTS: A 9T sealed rear hub supports smooth rolling performance, while a 14 mm axle adds durability to handle repeated landings and everyday BMX abuse.
- KNOW YOUR ROOTS: As one of the OGs in action sports, Mongoose has helped bring the BMX movement to the world. For over 50 years, we've been all about epic rides and pushing limits – and we're just getting started.

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B0H7SZ7KVX |
| Additional Features | Adjustable Seat |
| Age Range (Description) | Youth |
| Age Range Description | Youth |
| Best Sellers Rank | #130,797 in Sports & Outdoors ( See Top 100 in Sports & Outdoors ) #204 in Kids' Bicycles |
| Bicycle Drivetrain Type | Chain Drive |
| Bike Type | BMX Bike, Kids Bike |
| Brake Style | U Brake |
| Brand | Mongoose |
| Brand Name | Mongoose |
| Color | Black |
| Customer Reviews | 4.4 out of 5 stars 2,147 Reviews |
| Frame Material Type | High Tensile Steel |
| Included Components | Reflectors, User Manual |
| Intended Riding Terrain | BMX Terrain, Paved Roads, Urban Terrain |
| Item Type Name | BMX Bicycle |
| Item Weight | 28.6 pounds |
| Manufacturer | Mongoose |
| Maximum Weight Recommendation | 200 pounds |
| Minimum User Height | 48 inches |
| Model Name | Legion L20 |
| Model Number | M4146G27U2OS11 |
| Model Year | 2026 |
| Number Of Speeds | 1 |
| Number of Speeds | 1 |
| Power Source | Manual |
| Seat Material | Polyvinyl Chloride (PVC) |
| Size | 20-Inch Wheels/L20 |
| Specific Uses For Product | Freestyle |
| Suspension Type | Rigid |
| UPC | 038675293748 |
| Unit Count | 1 Count |
| Warranty Description | Limited lifetime warranty on frame. 1 year limited warranty on parts. 30 day limited warranty on wearable parts. |
| Warranty Type | Limited |
| Wheel Material | Aluminum |
| Wheel Size | 20 inches |
| Wheel Width | 2.35 inches |

## Product Details

- **Age Range (Description):** Youth
- **Bike Type:** BMX Bike, Kids Bike
- **Brand:** Mongoose
- **Color:** Black
- **Frame Material:** High Tensile Steel
- **Included Components:** Reflectors, User Manual
- **Number of Speeds:** 1
- **Special Feature:** Adjustable Seat
- **Suspension Type:** Rigid
- **Wheel Size:** 20 inches

## Images

![Mongoose Legion Kids Freestyle BMX Bike - Image 1](https://m.media-amazon.com/images/I/810mYsXyo5L.jpg)
![Mongoose Legion Kids Freestyle BMX Bike - Image 2](https://m.media-amazon.com/images/I/71ZWYgfiolL.jpg)
![Mongoose Legion Kids Freestyle BMX Bike - Image 3](https://m.media-amazon.com/images/I/71Z3vhLaYuL.jpg)
![Mongoose Legion Kids Freestyle BMX Bike - Image 4](https://m.media-amazon.com/images/I/81YQTLUke2L.jpg)
![Mongoose Legion Kids Freestyle BMX Bike - Image 5](https://m.media-amazon.com/images/I/81EUjKsie9L.jpg)

## Available Options

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

## Customer Reviews

### ⭐⭐⭐⭐⭐ Sturdy and well made
*by O***N on September 11, 2026*

Extremely well-made bike. Sturdy and heavy. Mongoose is always a reliable brand. Love the teal color. Highly recommended!

### ⭐⭐⭐⭐⭐ Yes! Mongoose is back to the good stuff!!!
*by M***Y on May 2, 2023*

Just get one. This is Mongoose like in the 80's and early 90's. Not the junk crap that Walmart and other department stores still sell. Avoid those like the plague! But then, that's apparent to any real BMX rider. Those are all flash for what little you pay and no real quality. If you already have one of those, strip it down to the bare frame and only the frame and build everything else up from scratch. That's those bikes only hope. This on the other hand is fine the way it comes. Ok, may have to make a few tweaks and whatnot along the way, but that's to be expected of even the best BMX bikes. It's part of riding and making it your own. I do wish they'd have given it at least a somewhat taller seat post, and I'm also not crazy about how the seat is permanently attached to the seat post as well. Normal seat and seat post setup is, if the seat wears out or isn't to your liking, you can just stick a new seat on the seat post. Here, you have to replace both. Was expecting something like a pivoting seat post or perhaps the old bolt down kind. On the other hand, the seat that's here, by BMX standards, is plenty acceptable until I upgrade. I got the L60 and I'm not sure it mentions it in the details, but it appears as though it's sporting a rear wheel that's sealed while the front wheel is not sealed. But the L60 is totally the midrange offering of the whole Legion lineup. So it's expected that a few things are somewhat average, besides, the rear wheel is where you want and need a better quality one at, uh, if you're going to cut corners that is. Also, contrary to what I'm seeing in other reviews here, the brakes do work surprisingly well. More than adequate. The bike arrived perfectly and overall inspection found one very minor blemish. Top tube on left side has like a weird smudge in the paint job that then glossed over for it's final painting. I tried Goo Gone thinking it might have just been grease, it's kind of a blackish color against green giving that effect sorta, but after a good rubbing it remains unchanged, so I can tell it's permanently on there. Both very minor and totally cosmetic, a classic error no doubt the result of being mass produced. Everything else is brilliant here plus I caught a sweet sale on mine and got it for only $146.87 + tax. Arrived quickly, packaged well, everything is in perfect condition, so yeah, I'll excuse one little minor smudge. Thank you Mongoose!!!!

### ⭐⭐⭐⭐⭐ 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.

## 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
- Zelerdo 2 Pairs Aluminum Alloy Bike Pegs for Mountain Bike Cycling Rear Stunt Pegs Fit 3/8 inch Axles
- Mongoose Legion Freestyle BMX Bike for Advanced-Level or Professional Riders, Adult Men Women, 4130 Chromoly Frame, and 20-Inch Wheels

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*Product available on Desertcart Japan*
*Store origin: JP*
*Last updated: 2026-09-18*