Mongoose Legion L20 BMX Bike White (2021)
Up to 12 months interest free

Perfect Ride Guarantee
If you don't love it, you can swap it, up to 30 days from purchase!* Learn more »

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.
Please note, due to challenges in the product supply chain, bike specifications are subject to change without notice. Specifications listed below may not match exactly as shown in the photo.
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 | MGM41801U10OS |
---|---|
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 |
Crankset | 1-piece, forged steel, 25T steel chainring |
Fork | Hi-Ten steel |
Handlebar | Mongoose, Hi-Ten steel, 26 in width, 7 in rise |
Headset | Threadless, 1-1/8" external, retainer bearing |
Hubs | F: Steel, ball bearing, 3/8 in axle, 28H R: Steel, ball bearing, 3/8 in axle 28H |
Pedals | Mongoose, nylon |
Rims | Aluminum single wall, 24 mm ID, 28H |
Saddle | Mongoose, steel rails |
Seatpost | Steel, 250 mm, 25.4 mm |
Stem | Mongoose, threadless front load, 48 mm |
Spokes | 14G, steel, black |
Tyres | 20 in x 2.3 in, wire bead |
Kids Bike Sizing | 20 Inch |
20" Freestyle BMX Sizing Chart
Top Tube
Top Tube
Top Tube
Top Tube
This is only an estimate, and every new bike comes with a free professional bike fit when you click & collect in store, plus all bikes have a 30 day Perfect Ride Guarantee.

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 |