20-Inch Steel Frame Black BMX Bike F8573

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 is designed to be a great introduction into the world of BMX.

Mongoose Legion Freestyle BMX Bike Series

Legion L10 | Legion L20 | Legion L40 | Legion L60 | Legion L80 | Legion L100 | Legion L500

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 25x9T gearing with one-piece tubular chromoly 170mm hollow spindle cranks and American loose ball bottom bracket offer a clean . reliable drivetrains.

Horizontal Top Tube Length: 515mm

Stand Over Height: 565mm

Chain Stay Length: 348mm

The Mongoose Legion L20 is designed for beginner-level riders and has a suggested rider height of 4'8'-5'4'


Horizontal Top Tube Length: 515mm

Stand Over Height: 565mm

Chain Stay Length: 348mm

The Mongoose Legion L20 is designed for beginner-level riders and has a suggested rider height of 4'8'-5'4'

Mongoose Legion L20 Freestyle BMX Bike

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Hi-Ten Steel Frame

The durable L20 features a Hi-Ten steel frame . removable brake mounts . and a 20.25-inch top tube length. Suggested rider height is 48 54.

Drivetrain and Chainring

The L20s drivetrain features 170mm one-piece forged steel cranks with a 25T alloy chainring and American loose ball 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.

4130 Chromoly Frame Tubes







4130 Chromoly Fork/Handlebar





Tubular Chromoly Cranks













Sealed Cartridge Crank Bearing











Sealed Bearing Rear Hub











Freecoaster Hub Technology



Sealed...