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Mongoose Legion L100 20" Black - 2020

For over 45 years, Mongoose has been in the dirt, at the park, and on the street! We offer a variety of Freestyle BMX Bikes for riders of all ages and ability levels, which are designed to withstand the punishment that takes place as you progress your BMX skills. Mongoose has always been an aggressive BMX brand with products that push the limits of what a rider can do.

With the Legion Series, Mongoose offers a full line of freestyle BMX bikes for riders of all ages and ability levels. The Legion L100 was designed to be a fully park, street and dirt worthy BMX bike that offers everything a rider could need from beginner level curb jumps all the way up to advanced aerial tricks on a quarterpipe!


Free 6 -8

Week Service

Lifetime Guarantee

on frame & forks

1 Year Free

warranty period
Model Name Legion L100
Colour Black
Model Number M41200U10OS
Wheel Size 20 in
Frame 4130 chromoly, BMX freestyle geometry, removable brake mounts, integrated headset, mid BB shell
Fork 4130 chromoly
Crank 2-piece, tubular chromoly hollow spindle, 25T aluminum chainring
Chain KMC S1
Bottom Bracket Mid sealed bearing, 8-spline spindle
Drivetrain Single-speed, 9T cassette driver
Rims Xposure Infinity-XD, aluminum double wall, 30 mm ID, 36H
Front Hub Aluminum, ball bearing, 3/8 in axle, 36H
Rear Hub Aluminum, sealed-bearing cassette, 14 mm axle, 36H
Spokes 14G, steel, black
Tyres 20 in x 2.4 in, wire bead
Pedals Mongoose, nylon
Brakes U-brake, aluminum
Handlebar Mongoose, 4130 chromoly, 29 in width, 8.75 in rise
Stem Mongoose, threadless top load, 50 mm
Headset Threadless, integrated 1-1/8", cartridge bearing
Seat Post Pivotal, steel, 250 mm, 25.4 mm
Saddle Mongoose Pivotal
Grips Mongoose MushXL, 160 mm
More Information
Code No. 1K89724
Brake Type: Caliper Front / U Brake Rear
Chain Set: 1 Piece --
Fork Lock Out: No
Forks Material/Brand: Rigid - Cro Moly
Gender: Unisex
Grips: Standard Rubber
Handle Bar Width: 710mm
Rims: Alloy - Double Wall
Stem Length: 60mm
Type BMX Bikes
Tyre Size: 20"
Wheel Size: 20"