Mongoose Legion Freestyle BMX Bike for Advanced-Level or Professional Riders, Adult Men Women, 4130 Chromoly Frame
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Availability:
In Stock.
Arrives
Wednesday, Aug 12
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Style: L80
Size: 20-Inch Wheels
Color: Red
Features
- L80 is a fully park, street or dirt worthy freestyle BMX bike, Hi-Ten steel 9 inch rise handlebar that will make you stand out at the bike park, Suggested rider height is 56 - 6'0".
- Ultra-durable Mongoose 4130 Chromoly front triangle, along with removable brake mounts and a mid BB shell, with a top tube length of 20.75 inches
- Drivetrain features 175 mm 3-piece tubular chromoly hollow spindle cranks with a 25T steel chainring and mid sealed bearing bottom bracket.
- Wheelset features 20 x 2.3 tires mounted on wide 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 4130 chromoly handlebar and fork are joined by a 50 mm stem and threadless sealed integrated headset for maximum steering performance.
Description
L10 L20 L40 L60 L100
Specs & Other Info
| Specification | Details |
|---|---|
| Bike Category | BMX Bike |
| Recommended Age Group | Big Kid |
| Manufacturer | Mongoose |
| Gears | Single Speed |
| Hue | Red |
| Tire Diameter | 20 Inches |
| Body Material | Chromoly Steel |
| Type of Suspension | Rigid |
| Key Features | Freestyle, Lightweight Aluminum Frame, BMX |
| Package Contents | Mongoose Legion L80 Freestyle BMX Bike |
| Wheel Measurement | 20-Inch Wheels |
| Braking System | U Brake |
| Activity Type | Trail Riding |
| Weight | 26.46 Pounds |
| Design Model | L80 |
| Product Line | Legion BMX |
| Manufacturing Year | 2020 |
| Package Dimensions | 48.75 x 23 x 8.5 inches |
| Product Dimensions | 23.62 x 8.66 x 48.82 inches |
| Warranty | Limited lifetime warranty on frame, 1 year on parts |
| Material Type | Steel |
| Intended User | Unisex-Adult |
| Handle Type | Mongoose MushXL, 160 mm |
Frequently asked questions
The Mongoose Legion Freestyle BMX Bike is best suited for advanced-level or professional riders. Its design and features cater to those who have considerable experience and are looking for a bike that can handle the demands of high-level freestyle BMX riding.
The Mongoose Legion is equipped with a 4130 Chromoly frame, which is known for its strength and lightweight properties, making it ideal for performing tricks and stunts. Additionally, the 20-inch wheels offer the agility and speed needed for competitive riding and complex freestyle moves.
Yes, the Mongoose Legion Freestyle BMX Bike is designed to be used by both adult men and women. Its versatile frame and setup make it a great choice for any rider looking for a high-quality, performance-oriented BMX bike.
While primarily designed for BMX freestyle and advanced riding, the Mongoose Legion is versatile enough to be used for everyday riding. Its durable construction and comfortable design make it suitable for daily commutes or casual rides, although its features are optimized for freestyle performance.
Similar Products
Top Amazon Reviews
🚀 Abunda's Overview
This is our summary and key points to consider based on customer reviews.
The reviews for the BMX bike highlight its solid construction and value for money, especially when purchased at a discount. Long-term BMX riders and new users alike appreciate the bike's full 4130 chromoly frame, fork, and bars, which offer a strong starting point for customization. The bike's comfort and suitability for both beginners and intermediate riders are repeatedly mentioned, alongside its smooth ride over various terrains. However, there are criticisms about the unsealed front wheel and the quality of some components like the sprocket and chain, which may require upgrades for optimal performance.
Pros
- 🚲 Full 4130 chromoly frame, fork, and bars for durability
- 🔧 Sealed rear wheel, mid bottom bracket, and internal headset contribute to a smooth ride
- 👍 Comfortable stock pivotal seat
- 🚀 Suitable for beginners and intermediate riders, as well as experienced BMX riders looking for a reliable secondary bike
- 💰 Great value for money when on sale or discount
Cons
- ❌ Unsealed front wheel might be considered a downside at the bike's full asking price
- ⚙️ Some components like the sprocket and chain are mass-produced and may require upgrades
- 🛠 Assembly might be challenging for some, requiring attention to detail before use
Should I Buy It?
If you are looking for a solid BMX bike that offers a good foundation for future upgrades and doesn't break the bank, especially on sale, this could be a great option. It's well-suited for both new riders and those returning to BMX, offering durability and a smooth ride. However, be prepared to potentially upgrade some parts for the best experience.
Style: L80
Size: 20-Inch Wheels
Color: Red
I owned a Mongoose MANY years back, and wanted another one just to cruise the beach on with my Family. I was an "Assembler" with a toy store, and am not new to putting a bicycle together. I tightened everything, double checked the seat and handlebars, put 36 pounds of air in the tires (they both call for 40psi.), rolled it into the kitchen, and POWW! The inner tube in the front tire burst leaving me with a brand new bike that I cannot even road test! WOW Mongoose!, NOT THE QUALITY THAT I REMEMBER BY ANY MEANS!! Other than that, the bicycle itself is Beautiful, well made, and LOOKS like it would be fun to ride...... Update: After contacting Mongoose Customer Service, I was treated with Respect and Honesty by Peyton who was an Absolute Angel to interact with. After submitting some pictures to verify my story, I had a brand new tire and tube on the way! Thankyou Peyton,the Customer Care Ambassador, And Thankyou Amazon for just being AWESOME!!
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Reviewed in the United States on September 8, 2025 by Warren Krueger
Style: L80
Size: 20-Inch Wheels
Color: Red
Once assembled it’s easily capable of bending the fabric of space-time itself causing a ripple effect that has the sheer power to break the sound force limit of the speed of light which results in a kinetic energy frontal lobe transmission gear sprocket rotating at about 420 mph.. with that being said that makes this bike faster than 2 airplane jet missile helicopters with turbo super charged nitrous gas injected fuel tanks that help compress the pistons for faster gear alignment with military grade specs.
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Reviewed in the United States on June 8, 2026 by Hunter Hewitt
Great bike!! I was so concerned with all of the less than great reviews (regarding used parts, missing parts, damaged areas, etc...)... The bike shipped to me was wrapped very well for long term storage, and shipping as well... Easy to put together (if you know even a little about how to do so), and has detailed instruction manual as well - for great reference and usage information... This bike (Legion L500 Teal/purple-blue) is a great bike with a very appealing color scheme as well... Bought this for my daughter's 10th birthday, and I don't think she will need another BMX style bike for a few years to come!! Great purchase and seller did great getting it to me in the best shape possible, in the least amount of time possible!! 👍
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Reviewed in the United States on November 23, 2021 by Siggy
Style: L80
Size: 20-Inch Wheels
Color: Red
I'm 46 years old as of this writing, 5'6" and weigh about 210. This bike made me feel like Cru Jones in the old movie "Rad" all over again. My kid thinks I'm cool for once in my life. 🤣 Solid sturdy frame, thick tires and relatively easy assembly made this one a great choice. It's super light and easy to manipulate. I have a word of warning. Please be careful when inflating the tires. There's a process, and you have to make sure that the inner tube is in place and that the "beads" (the little rim on the tires themselves) are nicely tucked into the rim metal rim of the wheel. THEN inflate. I blew the tube right when I got it! It was a quick repair and I was up and going quick. Mongoose support was quick to offer guidance, which is also a nice thing to have. Mongoose has been making bikes for years and years so they have a lot of knowledge at their disposal. I recommend this bike as a great value for your money and as a great way to get back into BMX riding as an adult if you haven't in a long time.
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Reviewed in the United States on May 12, 2026 by Nate
Style: L80
Size: 20-Inch Wheels
Color: Red
I like the rad color. ,2tone. Bike has a great name to it. Mongoose for the main bike. Thankso
Reviewed in the United States on May 24, 2026 by Donna Stewart
Style: L80
Size: 20-Inch Wheels
Color: Red
This bike is lacking. About what you would expect from walmart bikes. Wheels wobble. Some reason back tire will not stop moving. Had to readjust and tighten twice already in a few miles. Its geared way to low for anything other than quick burst at the bike park or skate parks. Its almost impossible to pedal if you are off pavement. If you are looking to buy a bike to ride for a kid or an adult this isn't what you want unless you plan on swapping gears. Like a bigger sprocket may be the best and cheapest route. Pretty disappointed
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Reviewed in the United States on May 11, 2026 by wade d.
Loved color. Can never go wrong with a mongoose
Reviewed in the United States on January 28, 2026 by yasmin perez
I absolutely love this bike. It's very light compared to others that I used to ride. Being 32 now I feel as if the 15 year old self has come out to play (warriors). It is ultra smooth ride at the given proce you can't beat it. I'm 5'8 and the l80 for 250 is a screaming deal and it's perfect at my height. I know this bike isn't meant to be fully seated rides but you definitely will need a better seat if your looking for longer rides. I mostly stand though but honestly I take this baby out for a good 10miles daily and am very pleased with the quality of the bike!
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Reviewed in the United States on May 17, 2023 by Mark