Mongoose Legion L20 Review

BMX bikes are available in quite a number and many of them are worth mentioning. These BMX bikes are considered great for different terrains and other activities. You will always find a certain BMX bike that will attend to all your needs and requirements in a perfect manner. This BMX bike will have all the necessary technologies and features to keep you running on track. When you talk about BMX bikes, there are two types of them, i.e. freestyle and race.

If you are interested in BMX riding for recreational and personal purposes, a freestyle BMX Bike like Mongoose Legion L20 is perfect for you. These kinds of bikes are greatly equipped with features suited for different terrains or stunts. If you want to ride BMX bikes professionally then race bikes are your go-to option. Here, we are talking about one of the best freestyle BMX bikes available today, i.e. Mongoose Legion L20. We will try to cover all aspects as under.

Mongoose Legion L20’s Specifications

Lets’ have a look at this bike’s specifications….



Model Name

Legion L20



Model Number



Hi-Tensile Steel


Hi-Tensile Steel

Maximum Weight Capacity

160 lbs.


1 Size


Mongoose, Steel Rails

Seat Post

Steel, 250 mm, 25.4 mm


3-piece, Tubular Chromoly


25T Steel


Mongoose, Nylon


U-Brake, Aluminum



Bottom Bracket

American Loose Ball, 8-spline Spindle


Cog, Single-Speed, 9T Cassette Driver


Aluminum Single Wall, 24 mm ID, 36H


14G, Steel, Black


20 x 2.3 inches, Wire Bread

Front Hub

Steel, Ball Bearing, 3/8 inch Axle, 36H

Rear Hub

Steel, Sealed-Bearing Cassette, 14 mm Axle, 36H


Mongoose, Steel Rails


Mongoose, Hi-Tensile Steel, 28-inch Width, 8 Inch Rise


Mongoose, Threadless Top Load, 50 mm


Threadless, Integrated 1-1/8ʺ External, Retainer Bearing


Mongoose Mush, 145 mm


Single-Speed, 9T Cassette Driver

Mongoose Legion L20 Review

Mongoose Legion L20 is perhaps one of the most stylish models available for a BMX bike. It is an important member of the ultimate Legion series that offers a full line of freestyle BMX bikes for riders of all ages and ability levels. The Legion L20 has everything a beginner needs to hit the streets and pop off the curbs. It belongs to the second tier in the Mongoose Legion range which is great for the money.

This BMX bike is available in a wide range of colors to make riding more fun for you. It is entirely safe to ride BMX bike with tough and high-textured wheels offering great traction. Being a lightweight bike, it is fairly easy to maneuver and control. It features a tough Hi-Tensile steel frame and fork that is built with modern BMX geometry for the ultimate riding experience. It is built with 3-piece Chromoly cranks which are reliable and provides a great ride every time.

Mongoose Legion L20 has a 20-inch wheel size. The front hub is steel-made featuring a ½ inch axle plastic body pedals. This model also features a tapered headtube and removable brake mounts. There are aluminum U-brakes and brake levers for proving precise speed control. You get a 5-year limited warranty on the purchase of this bike and a 1-year exchange of parts warranty.

Mongoose Legion L20 BMX Bike – Key Features

1. Frame

It is a bike meant for kids and young riders, still, it features a frame of racing bikes. You will enjoy a Hi-Tensile steel frame with removable brake mounts providing excellent performance. The top-tube length is 20.25 inch so a rider with a height of 4ʹ8ʺ – 5ʹ4ʺ will find this ride more than suitable.

2. Drivetrain and Chainring

Drivetrain and chainring are one of the most important parts of any BMX bike. Luckily, the Mongoose Legion L20 excels in this feature too. This BMX bike features 170 mm 1-piece forged steel cranks with a 25T alloy chainring and an American loose ball bottom bracket.

3. Wheelset and Hubs

Mongoose Legion L20 features a wheelset that has 20 x 2.3 inches tires mounted on aluminum single wall 36H rims with 3/8 inch female axle front hub. The rear hub is a 9T cog sealed bearing providing the ultimate riding experience.

4. Handlebars and Stem

Mongoose L20 will never disappoint you in any aspect and the handlebars and stem are no longer an exception. This bike features Aluminum U-Brake and brake levers for providing you with ultimate speed control and precision riding. The Hi-Tensile steel handlebar and fork are joined by a 50 mm stem and threadless sealed integrated headset for maximum steering performance.


Mongoose Legion L20 – Pros and Cons

Mongoose Legion L20 – Pros and Cons

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8Expert Score

  • Hi-Ten steel frame
  • Drivetrains are clean and reliable
  • Provides great grip and durability
  • Maximum steering performance
  • 3-piece forged steel cranks
  • Hi-Ten steel handlebar
  • Great aesthetics
  • Precision speed control
  • Wide color range
  • Textured wheels
  • East to assemble
  • Great for beginners
  • A little heavy for some riders
  • Some riders question the seat comfort

Mongoose Legion L20 Bike – FAQs

1. Does the Legion L20 come pre-assembled?

Everything is pre-assembled except the handlebars, wheels, and seat. Don’t worry, it is very easy to assemble this bike.

2. Does the Legion L20 bike has a freecoaster or cassette?

The Mongoose L20 has a cassette that clicks, you must pedal backward when rolling backward.

3. Do the handlebars spin 360 degrees?

No, it has brake cables that restrict the 360° movement.

Final Views

The Mongoose Legion L20 BMX Bike is an ideal bike for kids and young riders. It is also not bad for professional riders. It features a lot of things that are hard to find in such a price range. Not only the bike’s quality is great but it also gives you an unforgettable riding experience. Have this stylish freestyle bike and be on your way to a perfect BMX experience.

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