With the Legion Series, Mongoose offers a full line of freestyle BMX bikes for riders of all ages and ability levels. The Legion L40 is a fully park, street or dirt worthy freestyle BMX bike that offers everything a new rider could need to bust their first tricks on their local ramp!


  • Hi-Ten steel frame, removeable brake mounts, and mid BB shell.
  • Drivetrain features 175 mm 3-piece tubular chromoly hollow spindle cranks with a 25T steel chainring and mid sealed bearing bottom bracket.
  • 20” x 2.3” tires mounted on aluminum single wall 36H rims with 3/8” female axle front hub and 9T cog sealed bearing cassette rear hub.
  • Hi-Ten steel handlebar and fork, 50 mm stem, threadless sealed integrated headset, and aluminum U-brake and brake levers.
  • 20.5” top tube length. Suggested rider height is 5’0” – 5’6”.

Mongoose Legion L40 White BMX Bike 2020

  • Model Name Legion L40
    Colour White
    Model Number M41500U10OS
    Wheel Size 20 in
    Frame Hi-Ten steel, BMX freestyle geometry, mid BB shell
    Fork Hi-Ten steel
    Crank 3-piece, tubular chromoly, 25T steel chainring
    Chain KMC S1
    Bottom Bracket Mid sealed bearing, 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, integrated 1-1/8", retainer bearing
    Seat Post Steel, 250 mm, 25.4 mm
    Saddle Mongoose Unifier, 1 piece rails
    Grips Mongoose MushXL, 160 mm