---
product_id: 151300346
title: "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: "$1756.54"
currency: USD
in_stock: true
reviews_count: 13
category: "Mongoose"
url: https://www.desertcart.us/products/151300346-legion-kids-freestyle-bmx-bike-intermediate-rider-boys-and-girls
store_origin: US
region: United States of America
---

# 20-inch durable wheels Micro Drive 25x9T BMX gearing Hi-Ten steel frame for rugged use 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:** $1756.54
**Availability:** ✅ In Stock

## Summary

> 🚀 Own the streets and ramps with the Legion L40 – where durability meets freestyle freedom!

## Quick Answers

- **What is this?** 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?** $1756.54 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.us](https://www.desertcart.us/products/151300346-legion-kids-freestyle-bmx-bike-intermediate-rider-boys-and-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

- • **Park-Ready Performance:** Built tough with a Hi-Ten steel frame and 20.5" top tube for precision and durability on ramps, streets, and dirt trails.
- • **Grip & Control Mastered:** 36H aluminum rims paired with 2.3" BMX tires deliver superior traction and shock absorption for confident landings.
- • **Precision Braking System:** Aluminum U-brakes and alloy levers provide responsive speed control, perfect for mastering tricks safely.
- • **Smooth & Reliable Drivetrain:** Equipped with 175mm chromoly cranks and a sealed bottom bracket for clean, consistent power transfer every ride.
- • **Ready to Ride with Confidence:** Ships nearly assembled with a 5-year frame warranty—get on the bike fast and ride with peace of mind.

## Overview

The Mongoose Legion L40 is an intermediate-level freestyle BMX bike designed for riders 5’0" to 5’6". Featuring a rugged Hi-Ten steel frame, 20-inch wheels with grippy 2.3" tires, and a high-performance Micro Drive 25x9T gearing system, it excels on park, street, and dirt terrains. With precision aluminum U-brakes, chromoly cranks, and a sealed bottom bracket, this bike offers reliable control and power transfer. It ships mostly assembled and includes a 5-year limited frame warranty, making it a durable, value-packed choice for young BMX enthusiasts ready to push their limits.

## 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 L40 was designed to be a fully park, street and dirt worthy BMX bike. The Legion L40 features a Hi-Ten steel frame (20.5” top tube), tapered headtube, mid BB shell, and removable break mounts. The L40 Hi-Ten steel 8.75” rise handlebar and 50mm stem are designed for precision riding, while the aluminum single wall 36H rims and 2.3” BMX tires offer grip and durability when landing a trick. The 25x9T gearing with 3-piece tubular chromoly 175 mm hollow spindle cranks and mid sealed bottom bracket offer a clean, reliable drivetrains. Aluminum 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

- L40 is a fully park, street or dirt-worthy freestyle BMX bike that offers everything a new rider could need to bust their first tricks on their local ramp! Suggested rider height is 5’0”-5’6”
- Durable bike, built with a Hi-Ten steel frame, removable brake mounts, and a mid BB shell, and has a top tube length of 20.5"
- Equipped with a high-performance drivetrain that includes 175 mm 3-piece tubular chromoly hollow spindle cranks, a 25T steel chainring, and a mid-sealed bearing bottom bracket
- Wheelset featuring 20" x 2.3" tires mounted on 36H aluminum single-wall rims, along with a 3/8" female axle front hub and a 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 50 mm stem and threadless sealed integrated headset for maximum steering performance

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B07W6LSZMS |
| Additional Features | Aluminum Frame, BMX, freestyle |
| Age Range (Description) | Big Kid |
| Age Range Description | Big Kid |
| Best Sellers Rank | #51,483 in Sports & Outdoors ( See Top 100 in Sports & Outdoors ) #7,495 in Cycling Equipment |
| Bicycle Drivetrain Type | Single-speed |
| Bike Type | BMX Bike |
| Brake Style | U Brake |
| Brand | Mongoose |
| Brand Name | Mongoose |
| Color | Copper |
| Customer Reviews | 4.4 out of 5 stars 3,200 Reviews |
| Frame Material Type | High Tensile Steel |
| Gear Type | cassette |
| Global Trade Identification Number | 00038675187146 |
| Included Components | Mongoose Legion L40 Freestyle BMX Bike |
| Is Assembly Required | Yes |
| Is Autographed | No |
| Item Type Name | BMX Freestyle Bike |
| Item Weight | 12 Kilograms |
| Manufacturer | Pacific Cycle, Inc. |
| Minimum User Height | 60 Inches |
| Model Name | Legion Intermediate |
| Model Number | M41500U20OS-PC |
| Model Year | 2020 |
| Number Of Speeds | 1 |
| Number of Handles | 2 |
| Number of Speeds | 1 |
| Power Source | Pedal power |
| Seat Material | Nylon |
| Size | 20-Inch Wheels L40 |
| Skill Level | Intermediate |
| Specific Uses For Product | Trail |
| Style Name | Bmx |
| Suspension Type | Rigid |
| Theme | BMX |
| UPC | 038675187146 |
| Unit Count | 1.0 Count |
| Warranty Description | 5-year limited warranty on the frame and a 1-year limited 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:** Copper
- **Frame Material:** High Tensile Steel
- **Included Components:** Mongoose Legion L40 Freestyle BMX Bike
- **Number of Speeds:** 1
- **Special Feature:** Aluminum Frame, BMX, freestyle
- **Suspension Type:** Rigid
- **Wheel Size:** 20 Inches

## Images

![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/71VM+ZRMEfL.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.

### ⭐⭐⭐⭐⭐ MNG Legion L20 (Red): Excellent Bike!
*by A***R on May 31, 2020*

Received the bike within a week. Assembly difficulty was medium-low. The instruction manual was more general for all Mongoose BMX bikes. The simple order of assembly was: handlebars, brake, seat, wheel, pedals, pegs, (F&R) reflectors. Previous reviews claimed the brake line was a pain to install. Found out the hard way was to install the line into the handbrake right before mounting the handlebar. After everything was installed, i inspected the bike and tightened as necessary. The axel nuts were different sizes in the front and rear and pegs were properly sized for each. The brakes did require adjusting. I used a Park Tool 4th Hand. The tires needed a little bit of air for the recommend 40 psi. Both tires out of box were in the 30s. My son had no problem with this bike. He is 10yo and about 4’9”. This was not his first hand brake so no issues there. His previous bike was an 18” with coasters and hand brakes. He said this bike seems heavy but rides very smoothly. His only complaint is the whistling from the hollow stem bolt while he rides. I have even taken his bike for a few spins and it’s the perfect size and weight for your basic tricks and jumps. I did add a children’s Bell adjustable kickstand but doesn’t appear to last much longer. We want the kickstand because he’s always parking in the garage by the cars and doesn’t like the bike just laying on its pegs. Any questions, please feel free.

## 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 United States of America*
*Store origin: US*
*Last updated: 2026-07-24*