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 a stylish freestyle BMX bike that offers everything a beginning rider needs to hit the streets and pop off curbs!


  • Mongoose® Hi-Ten steel frame and fork; 8” handlebar
  • 3-piece chromoly tubular crank; 8-spline spindle
  • Aluminum single wall 36H rims; 2.3” tires

Mongoose Legion L20 Blue BMX Bike 2020

  • Model Name Legion L20
    Colour Blue
    Model Number M41800U10OS
    Wheel Size 20 in
    Frame Hi-Ten steel, BMX freestyle geometry
    Fork Hi-Ten steel
    Crank 3-piece, tubular chromoly, 25T steel chainring
    Chain KMC S1
    Bottom Bracket American loose ball, 8-spline spindle
    Drivetrain Single-speed, 9T cassette driver
    Rims Aluminum single wall, 24 mm ID, 36H
    Front Hub Steel, ball bearing, 3/8 in axle, 36H
    Rear Hub Steel, sealed-bearing cassette, 14 mm axle, 36H
    Spokes 14G, steel, black
    Tyres 20 in x 2.3 in, wire bead
    Pedals Mongoose, nylon
    Brakes U-brake, aluminum
    Handlebar Mongoose, Hi-Ten steel, 28 in width, 8 in rise
    Stem Mongoose, threadless top load, 50 mm
    Headset Threadless, 1-1/8" external, retainer bearing
    Seat Post Steel, 250 mm, 25.4 mm
    Saddle Mongoose, steel rails
    Grips Mongoose Mush, 145 mm