Mongoose BMX-Bicycles Legion BMX

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 bike is constructed with a frame made up of steel material, which weighs around 37 lbs. Consequently, the frame ensures durability and allows you to ride it for years to come. As far as the weight is concerned, the frame makes the bike weighs around 37 lbs. as well. It is neither the lightest one nor the heavier one. The rider can easily learn and perform the stunts on the bike with great stability. Though, you might have to face a little bit of difficulty in learning the jumping skill.

Pedals & sprocket

The bike is equipped with the 25/9 cassette setup and the smaller sprocket for offering you the perfect gearing mechanism, required for freestyle bike riding. Another added advantage of the smaller sprocket is the higher ground clearance. Along with all that, the bike also features 3 piece tubular crank tubes and durable pedals made up of alloy.


To support your freestyle riding experience, manufacturers have installed the alloy wheels of 36 spoke and the 20-inch length. All are in the black look including the rims and spoke as well. No doubt, these freestyle oriented wheels are going to help you a lot in your freestyle riding journey.

Mongoose Legion L40 Freestyle BMX Bike

Hi-Ten Steel Frame

The durable L40 features a Hi-Ten steel frame, removable brake mounts, mid BB shell, and a 20.5-inch top tube length. Suggested rider height is 5’0” – 5’6”.

Drivetrain and Chainring

The L40’s drivetrain features 175mm 3-piece tubular chromoly hollow spindle cranks with a 25T steel chainring and mid sealed bearing bottom bracket.

Wheelset and Hubs

The wheelset features 20 inch x 2.3 inch tires mounted on aluminum single wall 36H rims with 3/8” female axle front hub and 9T cog sealed bearing cassette rear hub.

Handlebars and Stem

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.