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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$501.80
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At a glance
- Condition
- New
- Style
- L500
- Size
- 20-in Wheels
- Color
- Silver
- Model
- M41100U10OS-PC
- Weight
- 11 kg
- Material
- Aluminum
- In the box
- Mongoose Legion L500 Freestyle BMX Bike
- Warranty
- Limited lifetime warranty on frame and one year warranty on parts
Features 5
- L500 is a fully park, street or dirt worthy freestyle BMX bike, beginner level curb jumps all the way up to advanced aerial tricks on a quarter pipe, Suggested rider height is 5'8" and up.
- Extreme durability, features a Mongoose full 4130 Chromoly frame with removable brake mounts and mid BB shell, featuring a 21 top tube length
- Drivetrain features 175 mm two-piece tubular chromo hollow spindle cranks with a 25T aluminum chain ring and mid sealed bearing bottom bracket.
- Wheelset features 20 x 2.4 tires mounted on wide aluminum double wall 36H rims with 3/8 female axle front hub and 9T cog sealed bearing free coaster 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 thread less sealed integrated headset for maximum steering performance.
Specs 38
| Bike Type | BMX Bike |
|---|---|
| Age Range (Description) | Big Kid |
| Brand | Mongoose |
| Number of Speeds | 1 |
| Color | Silver |
| Wheel Size | 20 Inches |
| Frame Material | Chromoly Steel |
| Suspension Type | Rigid |
| Special Feature | Aluminum Frame, BMX, freestyle |
| Size | 20-Inch Wheels |
| Brake Style | U Brake |
| Specific Uses For Product | Trail |
| Item Weight | 11 Kilograms |
| Theme | Action Sports |
| Style | L500 |
| Model Name | Legion BMX |
| Power Source | Pedal power (human energy transferred through a drivetrain) |
| Wheel Material | Aluminum |
| Year | 2020 |
| Seat Material Type | Nylon" or "Plastic |
| Warranty Type | Limited |
| Maximum Weight Recommendation | 72.75 Pounds |
| Assembly Required | No |
| Bicycle Gear Shifter Type | Trigger |
| Global Trade Identification Number | 61 |
| Minimum User Height | 68 Inches |
| UPC | 038675187061 |
| Bicycle Drivetrain Type | Chain-driven |
| Manufacturer | Pacific Cycle, Inc. |
| Frame Size | 20 inches |
| Frame Type | Diamond |
| Item Package Dimensions L x W x H | 48.6 x 23.5 x 10.3 inches |
| Package Weight | 16.15 Kilograms |
| Brand Name | Mongoose |
| Material | Aluminum |
| Suggested Users | unisex-adult |
| Number of Items | 1 |
| Part Number | M41100U10OS-PC |
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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 purchase.
Style: L500
Size: 20-Inch Wheels
Color: Silver
Good quality, easy to put together. Haven’t had a chance to ride yet cause it’s been very cold but I’m happy with my purchase. Got it on some kind of sale for $320. Can’t beat that.
Reviewed in the United States on February 14, 2026 by Joe Joe
Solid deal if catching it when the price is right.
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
Great Ride – Perfect for Jumps and Cruising!
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
Simple beauty for a grown person
So, one big thing to note with this bike is that the bolts on the wheels are not the most common kind. You won't be able to use the old-school type of pegs because the bolts go inward on the back. In other words, the wheels have a hole in them and the bolt needs to go through the wheel fork and peg and then into the wheel. I don't know why the wheels are threaded differently than each other, but if you plan to put pegs on this, it will involve a little more research than what I did. This is just a unique detail to note and consider. In no way does this reflect on this bike in and of itself. This bike is a beautiful work of simple design. I took off a couple of the stickers just because I love the look of the brushed gunmetal paint finish. The paint is so satiny and it really sets off the whole look of the bike with these infinity wheels. I am just an old-school grown man born in the late 70s who wants a bike that reminds me of what a bike used to be, I am not a vert ramp dude or anything like that. So, I love the single break and every effort made to design this bike for a minimal look. It is a little more heavy than I recall my childhood Huffy bike being, but I am too. What I love most with this bike is how deceptively long it is. You can have quite a bit longer arms and legs than mine (I'm average) and still do quite well with this design. My son is eight and this is clearly not a bike designed for his dimensions. My wife insisted I not get a kids bike and this my friends is certainly no kid's bike, however nostalgic it might make me feel.
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Reviewed in the United States on April 16, 2025 by Jason Harrington
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
Don't waste your time or money
This could be a good bike, but careless packing, shoddy assembly, and poor service makes it a waste. It came with nicks, dings, and scratches on the rims, some glue stuck on it in a few places, some scratches, and worst of all, the plastic bracket that holds the chainguard in place messed up the paint (see picture). Amazons only option (after cutting all the 15 or so zip ties, and removing the foam and cardboard wrapping) was to somehow repack everything and send it back, and Mongoose's absolutely ridiculous response was to find some nail polish of the same color and paint over it. Very disappointing purchase.
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Reviewed in the United States on August 6, 2023 by Amazon Customer Amazon Customer
Pretty solid, maybe a little overpriced
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