Mongoose Legion Freestyle BMX Bike for Advanced-Level or Professional Riders, Adult Men Women, 4130 Chromoly Frame, and 20-Inch Wheels
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At a glance
- Condition
- New
- Style
- L80
- Size
- 20-in Wheels
- Color
- Dark Blue
- Model
- M41301U20OS
- Dimensions
- 24.41 x 9.06 x 53.15 in
- Weight
- 12 kg
- In the box
- Bike
- Warranty
- Limited Lifetime
Features 5
- L80 is a fully park, street or dirt worthy freestyle BMX bike, Hi-Ten steel 9 inch rise handlebar that will make you stand out at the bike park, Suggested rider height is 56 - 6'0".
- Ultra-durable Mongoose 4130 Chromoly front triangle, along with removable brake mounts and a mid BB shell, with a top tube length of 20.75 inches
- Drivetrain features 175 mm 3-piece tubular chromoly hollow spindle cranks with a 25T steel chainring and mid sealed bearing bottom bracket.
- Wheelset features 20 x 2.3 tires mounted on wide aluminum single wall 36H rims with 3/8 female axle front hub and 9T cog sealed bearing cassette rear hub.
- Aluminum U-brake and brake levers provide precision speed control, while the 4130 chromoly handlebar and fork are joined by a 50 mm stem and threadless sealed integrated headset for maximum steering performance.
Specs 32
| Bike Type | BMX Bike |
|---|---|
| Age Range (Description) | Big Kid |
| Brand | Mongoose |
| Number of Speeds | 1 |
| Color | Dark Blue |
| Wheel Size | 20 Inches |
| Frame Material | Alloy Steel |
| Suspension Type | Rigid |
| Special Feature | Aluminum Frame, BMX, freestyle |
| Size | 20-Inch Wheels |
| Brake Style | U Brake |
| Specific Uses For Product | BMX |
| Item Weight | 12 Kilograms |
| Style | L80 |
| Model Name | Legion BMX |
| Power Source | Pedal power |
| Wheel Material | Aluminum |
| Year | 2022 |
| Seat Material Type | Leather |
| Warranty Type | Limited |
| Assembly Required | Yes |
| Minimum User Height | 5 Feet |
| UPC | 038675218642 |
| Bicycle Drivetrain Type | Single Speed |
| Manufacturer | Pacific Cycle, Inc. |
| Item Package Dimensions L x W x H | 48.3 x 24.9 x 12.5 inches |
| Package Weight | 15.29 Kilograms |
| Item Dimensions LxWxH | 24.41 x 9.06 x 53.15 inches |
| Brand Name | Mongoose |
| Material | Other, Steel |
| Suggested Users | unisex-adult |
| Part Number | M41301U20OS |
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View our full returns policy here.
To initiate a return, please visit our Returns Center.
View our full returns policy here.
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Top Amazon Reviews
Good bike for the money , pro quality, novice riders bike.
Style: L500
Size: 20-Inch Wheels
Color: Silver
The media could not be loaded. Great bike for the money! If you are a novice rider and want pro quality at a good price this could work for you , a very sturdy chromoly frame fork and bars with some pretty good parts, double wall rims and a free coaster rear hub, strong 2 piece crankset with the normal 25t crank sprocket and a 9tooth rear free coaster hub, strong half link nickel plated chain does the job. Only problem I see with this bike is it is a little bit too heavy to be used professionally. If you are a bigger guy or gal who wants a professional grade bike that is strong and has good quality parts buy this bike it’s a great value. I feel like it looks really good too. Mongoose built this for strength. Not a Walmart Mongoose for sure.
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Reviewed in the United States on July 29, 2025 by PowermanZ PowermanZ
Solid deal if catching it when the price is right.
Style: L100
Size: 20-Inch Wheels
Color: Blue
This review is coming from someone who has riden bmx for over 20 years, and has worked in or been a part of the bmx industry for over a 15 years now. So I know a a few things when it comes to high end, low end and everything in between. With that out of that way, let me say this, the L100 has a lot of good going for it. If managing to catch it for under $400 you can't go wrong. The full 4130 chromoly frame fork and bars is a huge step in the right direction and an excellent starting foundation if wanting to upgrade the bike in the future. The sealed rear wheel, mid bottom bracket, and internal headset are also nice, but I'll touch on those in a bit. The frame accommodates wide tires, I've pictured a 2.4" eclat fireball in the rear. The forks also have ample space for large tires as well. Stock pivotal seat is pretty comfy. Brakes feel pretty solid for stock brakes. Now, where the bike does fall short. The front wheel, it's unsealed. At the original asking price, there are other bike companies out there in this price range offering better specs. So I would have liked to see a sealed hub here. Now, the rims on these bikes are pinned instead of welded. While not a huge deal when you take in to account who this bike is marketed to, it's still something to make note of. The sprocket suffers from the "mass produced quickly" so it was rather bent causing some tight spots. Usually this is something you can't avoid on complete bikes like this. Stock chain is dainty, so I upgraded to a shadow v2 half link. There was grease on the clamp area of the stem where the bars go. I've never in my life greased that area, and I definitely recommend anyone gets one to check it before slapping the bars on. All in all, I purchased this for my wife to pedal around with me at skateparks so I wasn't expecting to be wowed. However I wasn't let down by the quality. Mongoose may be known as a department store brand, but they do have quite the bmx heritage. I think if you can score this bike on a deep discount, or sale and swap out the wheels, chain, perhaps stem and cranks at some point. You'll have a solid bike. Straight out of the bike, it's great for beginnera and intermediate or that old guy getting back in to it after years off the bike. Also, one thing to note, some of reviews are of people who bought a bmx bike and don't really understand what they bought. So for those reviews noting the chain guard or a kick stand. This isn't meant for a kickstand. And the chain guard is there because it has to be, you really aren't expected to keep it on the bike.
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Reviewed in the United States on February 24, 2023 by Kei Kei
Very strong bike
Style: L500
Size: 20-Inch Wheels
Color: Silver
Good bike
Reviewed in the United States on September 17, 2025 by suzette medina
Great Ride – Perfect for Jumps and Cruising!
Style: L100
Size: 20-Inch Wheels
Color: Grey/Black
The Mongoose Legion L100 was pretty easy to put together, even though the directions could’ve been a little clearer. Thankfully, most of it is self-explanatory. Once assembled, the bike rides fantastic — super smooth and the seat is surprisingly comfortable for a BMX. It’s held up great for jumps and is perfect for both freestyle tricks and casual riding. Definitely a great value for the quality!
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Reviewed in the United States on May 19, 2025 by Dawn
Adult BMX bike
Style: L100
Size: 20-Inch Wheels
Color: Grey
Awesome bike for the price and easy to assemble.
Reviewed in the United States on September 6, 2025 by Joe Joe
Pretty solid, maybe a little overpriced
Style: L100
Size: 20-Inch Wheels
Color: Grey/Black
Out of the box had no issues with assembly. During test rides it held up pretty well. The main issue I had was the chainring was bent. I noticed it after the second test ride. It caused tight spots in the chain and might lead to a failure if tightened too much or at the proper tension. During the rides the chain didn’t slip though. Other than that, maybe with a better chain and upgraded wheels,(also, the rear wheel doesn’t have as smooth a ride as premium versions of this type of bike) this bike could handle some stress put to it.
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Reviewed in the United States on July 13, 2025 by josh58
Perfect starter bmx
Style: L100
Size: 20-Inch Wheels
Color: Grey/Black
Perfect beginner BMX. Size is really good, small lightweight bike, super durable and affordable. Can easily pick it up with one hand. Make sure you tighten everything first! Brakes are good, I like having them to stop since I am a beginner. Can always be swapped in and out in case you want to do more bar spin stuff. Tires are good, I also equipped the back with odyssey pegs
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Reviewed in the United States on May 28, 2025 by Zein Zein
bike condition inaccurate
Style: L500
Size: 20-Inch Wheels
Color: Silver
Received a very used bike, and the description was not accurate. Scratches all over bike, and sticky sticker residue. This purchase i was not happy with, big hassle to return this bike. Big Let Down
Reviewed in the United States on September 15, 2025 by SAMI