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Mongoose

Mongoose Legion Freestyle BMX Bike for Advanced-Level or Professional Riders, Adult Men Women, 4130 Chromoly Frame, and 20-Inch Wheels

  • Based on 742 reviews
Condition: New
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Availability: Only 4 left in stock, order soon!
Fulfilled by Amazon
Arrives Tuesday, Oct 21
Order within 7 hours and 59 minutes
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Style: L100


Size: 20-Inch Wheels


Color: Green


Features

  • L100 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 quarterpipe, Suggested rider height is 5'8" and Up
  • Extreme durability, Mongoose full 4130 Chromoly frame, removable brake mounts, mid BB shell, featuring a 21 top tube length
  • Drivetrain features 175 mm two-piece tubular chromoly hollow spindle cranks with a 25T aluminum chainring 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 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.

Bike Type: BMX Bike


Age Range (Description): Big Kid


Brand: Mongoose


Number of Speeds: 1


Color: Green


Wheel Size: 20 Inches


Frame Material: Chromoly Steel


Suspension Type: Rigid


Special Feature: Aluminum Frame, BMX, freestyle


Included Components: Bike


Bike Type: ‎BMX Bike


Age Range (Description): ‎Big Kid


Brand: ‎Mongoose


Number of Speeds: ‎1


Color: ‎Green


Wheel Size: ‎20 Inches


Frame Material: ‎Chromoly Steel


Suspension Type: ‎Rigid


Special Feature: ‎Aluminum Frame, BMX, freestyle


Included Components: ‎Bike


Size: ‎20-Inch Wheels


Brake Style: ‎U Brake


Specific Uses For Product: ‎Freestyle BMX riding, Street riding, Dirt jumping


Item Weight: ‎12 Kilograms


Style: ‎L100


Model Name: ‎Legion BMX


Power Source: ‎Pedal power


Wheel Material: ‎Aluminum


Year: ‎2022


Seat Material Type: ‎Rubber


Warranty Type: ‎Limited


Assembly Required: ‎Yes


Bicycle Gear Shifter Type: ‎Trigger


Minimum User Height: ‎58 Inches


UPC: ‎038675218611


Bicycle Drivetrain Type: ‎Chain


Manufacturer: ‎Pacific Cycle, Inc.


Item Package Dimensions L x W x H: ‎49 x 23.5 x 9 inches


Package Weight: ‎16.03 Kilograms


Item Dimensions LxWxH: ‎24.41 x 9.06 x 53.15 inches


Brand Name: ‎Mongoose


Warranty Description: ‎Limited Lifetime


Material: ‎Steel


Suggested Users: ‎unisex-adult


Part Number: ‎M41201U10OS


Date First Available: November 12, 2020


Frequently asked questions

If you place your order now, the estimated arrival date for this product is: Tuesday, Oct 21

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.

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Similar Products

Top Amazon Reviews

    • Good bike for the money , pro quality, novice riders bike.
Style: L500 Size: 20-Inch Wheels Color: Silver
Review Image by PowermanZ PowermanZ
Review Image by PowermanZ PowermanZ
Review Image by PowermanZ PowermanZ
Review Image by PowermanZ PowermanZ
Review Image by PowermanZ PowermanZ
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. ... show more
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
Review Image by Kei Kei
Review Image by Kei Kei
Review Image by Kei Kei
Review Image by Kei Kei
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. ... show more
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! ... show more
Reviewed in the United States on May 19, 2025 by Dawn
    • Adult BMX bike
Style: L100 Size: 20-Inch Wheels Color: Grey
Review Image by Joe Joe
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. ... show more
Reviewed in the United States on July 13, 2025 by josh58
    • Perfect starter bmx
Style: L100 Size: 20-Inch Wheels Color: Grey/Black
Review Image by Zein Zein
Review Image by Zein Zein
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 ... show more
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

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