Mongoose Legion Freestyle BMX Bike for Advanced-Level or Professional Riders, Adult Men Women, 4130 Chromoly Frame, and 20-Inch Wheels
Condition: New
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This item is eligible for return within 30 days of receipt
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Availability:
In Stock.
Arrives
Monday, Aug 11
Style: L500
Size: 20-Inch Wheels
Color: Silver
Features
- 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.
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: freestyle, Aluminum Frame, BMX
Included Components: Mongoose Legion L500 Freestyle BMX Bike
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: freestyle, Aluminum Frame, BMX
Included Components: Mongoose Legion L500 Freestyle BMX Bike
Size: 20-Inch Wheels
Brake Style: U Brake
Specific Uses For Product: Trail
Item Weight: 11 Kilograms
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
Is Autographed: No
Global Trade Identification Number: 61
Minimum User Height: 68 Inches
UPC: 038675187061
Bicycle Drivetrain Type: Chain-driven
Manufacturer: Pacific Cycle, Inc.
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
Warranty Description: Limited lifetime warranty on frame and one year warranty on parts
Material: Aluminum
Suggested Users: unisex-adult
Number of Items: 1
Part Number: M41100U10OS-PC
Date First Available: August 6, 2019
Frequently asked questions
If you place your order now, the estimated arrival date for this product is:
Monday, Aug 11
Yes, absolutely! You may return this product for a full refund within 30 days of receiving it.
To initiate a return, please visit our Returns Center.
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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Learn more about financing & leasing here.
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Top Amazon Reviews
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
Style: L100
Size: 20-Inch Wheels
Color: Grey/Black
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
Style: L100
Size: 20-Inch Wheels
Color: Green
I bought this for all the kids do tricks on and they love it so much I probably need to get a few. It goes super fast easy to do tricks on.
Reviewed in the United States on July 18, 2025 by TheLambMan
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
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
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
Style: L100
Size: 20-Inch Wheels
Color: Grey/Black
Good bike. Perfect for my teen grandson
Reviewed in the United States on July 1, 2025 by Marla B. Atkinson
Style: L100
Size: 20-Inch Wheels
Color: Grey/Black
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