Mongoose Legion L40 BMX Bike Copper (2020)
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 comes with a complimentary free tune-up and safety check.
Please note that, in order to reduce production and delivery times, bike specifications are subject to change by the manufacturer without notice. Please be aware that these changes might not be reflected on product pages and images.
The Mongoose Legion L40 BMX bike is a rad BMX bike for riders of any age or ability that are after a totally dialled freestyle machine. The L40 is an extremely capable BMX bike which is ideally suited to all riders who want to step up their game. The tough Hi-Ten steel frame and fork is built with modern BMX geometry for the ultimate riding experience. The L40 is built with 175mm 3 piece tubular chromoly cranks which are reliable for the best ride every single time. While the aluminium U-Brake gives you the control that you need in the skate park or streets. You'll be rolling on 20x2.3" tyres and aluminium single wall 36H rims for a smooth ride. The Mongoose Legion L40 BMX bike offers some awesome spec at a great price which makes it the perfect way start out on a full size 20" BMX bike.
Features
- Hi-Ten steel frame, removable brake mounts, and mid BB shell.
- 175mm 3-piece tubular chromoly hollow spindle cranks with a 25T steel chainring and mid sealed bearing bottom bracket.
- 20” x 2.3” tyres mounted on aluminum single wall 36H rims with 3/8” female axle front hub and 9T cog sealed bearing cassette rear hub.
- Hi-Ten steel handlebar and fork, 50mm stem, threadless sealed integrated headset, and Aluminum U-brake.
- 20.5-inch top tube length. Suggested rider height is 5’0” – 5’6”.
SKU | MGM41500U20OS |
---|---|
Season | 2020 |
Size | 20inch |
Click & Collect | Yes |
Frame | Hi-Ten steel, BMX freestyle geometry, mid BB shell |
Frame Material | Steel |
Fork | Hi-Ten steel |
Fork Material | Steel |
Speeds | ## x ## |
Front Gears | Single |
Crankset | 3-piece, tubular chromoly, 25T steel chainring |
Pedals | Mongoose, nylon |
Chain | KMC S1 |
Brake Type | Rim Brake |
Cassette | Single-speed, 9T cassette driver |
Wheel Size | 20" |
Tyres | 20 in x 2.3 in, wire bead |
Rims | Aluminum single wall, 24 mm ID, 36H |
Hubs | Steel, ball bearing, 3/8 in axle, 36H R: Steel, sealed-bearing cassette, 14 mm axle, 36H |
Spokes | 14G, steel, black |
Bottom Bracket | Mid sealed bearing, 8-spline spindle |
Handlebar | Mongoose, Hi-Ten steel, 28 in width, 8 in rise |
Headset | Threadless, integrated 1-1/8", retainer bearing |
Grips | Mongoose MushXL, 160 mm |
Stem | Mongoose, threadless top load, 50 mm |
Saddle | Mongoose Unifier, 1 piece rails |
Seatpost | Steel, 250 mm, 25.4 mm |
Sizing | 20 Inch |
Top Tube Length | 20.5 |
Top Tube Length Range | 20.x" |
20" Freestyle BMX Sizing Chart
Top Tube
Top Tube
Top Tube
Top Tube

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 | TT Top Tube (mm) | 20.5 | HTA Head Tube Angle (°) | - | HT Head Tube (mm) | - | S Stack (mm) | - |