Mongoose Legion L20 BMX Bike 2019 20w

Article number: M41509M10OS
Availability: Contact Store for Availability

Ranging from the LXS to the L100, the Legion series of bikes offers everything a BMX rider could need from your first true BMX bike in the L18 to a fully park, street and dirt worthy machine in the L100. Mongoose® has infused over 40 years of experience along with feedback and insights from our pro riders to develop the best line of Legion bikes yet.


  • Frame: Hi-Ten steel, BMX freestyle geometry
  • Fork: Hi-Ten steel, 1 1/8" threadless steerer, taper leg
  • Crank: 1-piece
  • Chain: KMC® Z410
  • Bottom Bracket: American loose ball
  • Cog Set: 9T cassette driver
  • Rims: aluminum single wall 36H
  • Front Hub: Steel, 3/8" axle; 36H
  • Rear Hub: 36H, 9T Cassette, 14 mm axle, sealed bearing, AL shell
  • Spokes: 14G black
  • Tires: 20" x 2.3"
  • Pedals: BMX, nylon
  • Brakes: aluminum U-brake
  • Brake Levers: aluminum
  • Handlebar: Mongoose®, Hi-Ten, 8"
  • Grips: Mongoose® Mush, 145 mm
  • Stem: Mongoose®, top load, 50 mm ext.
  • Headset: threadless 1-1/8" external
  • Seat Post: steel, 25.4 mm
  • Saddle: Mongoose® slim-railed
  • Components - Extras:brake detangler, 2 pair axle pegs
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