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.


Sizes OS
Frame Hi-Ten steel BMX geometry
Fork Hi-Ten steel 20" 1" threaded steerer 3/8" x 100 mm
Crank 1-piece 36T steel chainring
Bottom Bracket American loose ball
Cog Set 16T freewheel
Chain KMC>Z410
Front Derailleur -
Wheel Size 20"
Rims aluminum single wall, 36H
Front Hub steel ball bearing 3/8" axle 36H
Pedals BMX nylon
Handlebar Mongoose Hi-Ten 26" 7" 22.2 mm clamp
Stem Mongoose,threaded top load, 50mm
Headset threaded 1" ball bearing
Brake Levers aluminum/resin
Spokes 14G stainless steel, black
Saddle Mongoose steel
Seat Post steel, 250 mm, 25.4 mm

Size Guide

Use the top tube length found in the geometry chart below, to help you figure out which Mongoose BMX bike is best for you. Keep in mind, experience, riding style and preference must be taken into account as well.

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