Mongoose Legion L20 BMX Bike Green (2021)
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Free Bike Build
We'll build your bike for free when you click and collect at any 99 Bikes store.

First Free Tune-up
Every bike come with a complimentary free tune-up and safety check.
The Mongoose Legion L20 BMX is a 20 inch BMX to help you enter the world of freestyle in style. The Legion is a great first bike, with a range of reliable, safe and durable spec. The L20 is built with a tough Hi-Ten steel frame, forks and 8 inch handlebars which are light enough so that you can ride in control. The saddle and grips are comfortable to ensure that you can enjoy every ride without issue and the aluminium U-brake adds safe control this speed machine so that you can ride with confidence. The Mongoose Legion L20 BMX bike offers everything a beginner could ask for in a BMX, ready to hit the streets and dominate from day dot.
Features
- Mongoose® Hi-Ten steel frame and fork; 8” handlebar
- 3-piece chromoly tubular crank; 8-spline spindle
- Aluminium single wall 36H rims; 2.3” tyres
SKU | MGM41801U20OS |
---|---|
Season | 2021 |
Size | 20inch |
Click & Collect | Yes |
Wheel Size | 20" |
Frame Material | Steel |
Fork Material | Steel |
Brake Type | U-Brake |
Bottom Bracket | American loose ball |
Cassette | Single-speed, 9T cassette driver |
Chain | KMC S1 |
Fork | Hi-Ten steel |
Grips | Mongoose, Hi-Ten steel, 26 in width, 7 in rise |
Handlebar | Mongoose, threadless front load, 48 mm |
Headset | Steel, 250 mm, 25.4 mm |
Hubs | Aluminum single wall, 24 mm ID, 28H |
Pedals | Mongoose, nylon |
Rims | 14G, steel, black |
Saddle | F: Steel, ball bearing, 3/8 in axle, 28H R: Steel, ball bearing, 3/8 in axle 28H |
Seatpost | Mongoose, steel rails |
Stem | Threadless, 1-1/8" external, retainer bearing |
Spokes | 20 in x 2.3 in, wire bead |
Tyres | 1-piece, forged steel, 25T steel chainring |
Kids Bike Sizing | 20 Inch |

Legend
ST Seat Tube
TT Top Tube
CS Chain Stay Length
HTA Head Tube Angle
STA Seat Tube Angle
BD Bottom bracket Drop
HT Head Tube
FL Fork Length
R Reach
S Stack
WB Wheel Base
Size |
20inch | Wheel Size | 20" | Frame Size | 20inch | ST Seat Tube (mm) | 223.0 | TT Top Tube (mm) | 515.0 | CS Chain Stay Length (mm) | 348.0 | HTA Head Tube Angle (°) | 74.0 | STA Seat Tube Angle (°) | 71.0 | HT Head Tube (mm) | 100.0 | S Stack (mm) | - | WB Wheel Base (mm) | 916.0 |