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Mongoose

Mongoose Legion BMX Bike, 16, 18 or 20 Inch Bike for Kids and Adults, Hi-Ten Steel Frame, 25x9T, 36x16T or 40x16T Gearing, Black/Teal, Silver, Orange, Red, Green, Black or Light Blue

  • Based on 4,133 reviews
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Availability: Only 3 left in stock, order soon!
Fulfilled by Amazon
Arrives Sunday, Mar 15
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Color: Red


Size: 20-Inch Wheels/L10


Features

  • Legion L10 is a great first BMX bikes for beginners with standard 20 Inch wheels, the recommended rider's height is 4'4" to 5'0"
  • Durable Hi-Ten steel frame and removable brake mounts with 20 top tube length
  • Single speed drivetrain features 170 mm one-piece forged steel crank with a 25T steel chainring and American loose ball bottom bracket
  • Wheelset features 20 x 2.25 tires mounted on aluminum single wall 36H rims with 3/8 female axle front hub and 9T cog sealed bearing cassette rear hub
  • Steel U-brake and aluminum/resin brake levers provide precision speed control, while the Hi-Ten handlebar and fork are joined by a 48 mm stem and threadless sealed integrated headset for maximum steering performance

Description

Unleash the fun with the Mongoose Legion Mag, the perfect BMX bike for kids. With 16, 18 or 20-inch wheels, this kids bike is ideal for riders from less than 3'6"" - 6'0"" tall, offering a thrilling way to build confidence and skills. The hi-ten steel frame is tough enough to handle jumps and turns, while the 25x9T, 36x16T or 40x16T gearing keeps the ride nice and smooth. Aluminum mag wheels with sealed bearings ensure you’re on the coolest bike on the block. Alloy rear U-brakes offer reliable stopping power to help support your next trick or stunt. Young riders can feel like BMX pros. Assembly is easy with a few common household tools and the included instruction guide. At Mongoose, we know our roots – as pioneers in BMX and action sports for over 50 years, we're dedicated to delivering an epic ride every time. Get ready to push the limits.

Bike Type: BMX Bike


Age Range (Description): Little Kid


Brand: Mongoose


Number of Speeds: 1


Color: Red


Wheel Size: 20 Inches


Frame Material: High Tensile Steel


Suspension Type: Rigid


Special Feature: Aluminum Frame, BMX, freestyle


Included Components: Mongoose Legion L10 Freestyle BMX Bike


Bike Type: ‎BMX Bike


Age Range (Description): ‎Little Kid


Brand: ‎Mongoose


Number of Speeds: ‎1


Color: ‎Red


Wheel Size: ‎20 Inches


Frame Material: ‎High Tensile Steel


Suspension Type: ‎Rigid


Special Feature: ‎Aluminum Frame, BMX, freestyle


Included Components: ‎Mongoose Legion L10 Freestyle BMX Bike


Size: ‎20-Inch Wheels/L10


Brake Style: ‎U Brake


Specific Uses For Product: ‎Trail


Item Weight: ‎12 Kilograms


Style: ‎Legion L10


Model Name: ‎Legion Novice


Power Source: ‎manual


Wheel Material: ‎Aluminum


Year: ‎2020


Warranty Type: ‎Limited


Maximum Weight Recommendation: ‎150 Pounds


Assembly Required: ‎No


Global Trade Identification Number: ‎14


Minimum User Height: ‎44 Inches


UPC: ‎038675187214


Bicycle Drivetrain Type: ‎Single-speed


Electric Assist Type: ‎Manual


Manufacturer: ‎Pacific Cycle, Inc.


Frame Size: ‎20 Inches


Frame Type: ‎Rigid


Item Package Dimensions L x W x H: ‎48 x 23 x 8 inches


Package Weight: ‎15.58 Kilograms


Item Dimensions LxWxH: ‎23.62 x 8.66 x 48.82 inches


Brand Name: ‎Mongoose


Warranty Description: ‎5-year limited warranty on the frame and a 1-year limited warranty on parts.


Material: ‎Other, Steel


Suggested Users: ‎unisex-child


Number of Items: ‎1


Part Number: ‎M41900U20OS-PC


Grip Type: ‎Mongoose Mush, 145 mm


Date First Available: August 6, 2019


Frequently asked questions

If you place your order now, the estimated arrival date for this product is: Sunday, Mar 15

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

    • Extremely Easy to Assemble. Bike Looks Amazing. M8x1.25 Tap May be Needed.
Color: Orange Size: 20-Inch Wheels/MAG
Review Image by Dave Dave
Review Image by Dave Dave
Review Image by Dave Dave
Review Image by Dave Dave
Review Image by Dave Dave
Review Image by Dave Dave
The bike from the pictures looked pretty cool. I didn't realize how beautiful this bike would be until it came in the mail. I purchased the Legion Mag in orange for my 8 year old. It was great to see his reaction on Christmas when receiving this bike. He was so excited. I read some other reviews from reviewers who had complaints on the difficulty of assembling the bike and in my opinion the people having trouble assembling the bike must be blatantly ignorant or illiterate. The instructions for assembly are written so a teenager could assemble this bike, with clearly labeled diagrams and more in depth explanations than what is necessary for assembly. The instructions on assembly are excellent and I had almost no trouble assembling the bike without them until it came to adjusting the brakes. I assembled the entire bike without instructions except for the brakes because it is just self explanatory. I was also able to assemble the brakes without any trouble or needing the instructions although I did refer to them for proper adjustment and alignment protocols. The only issue I had when assembling the bike is when I got to the point of attaching the handlebars to the handlebar binder assembly attached to the stem. The four socket cap screws that tighten down on the handlebar binder bracket would not thread easily. I felt as though I would break the screws or destroy the threads if I attempted to tighten them down far enough to grip the handlebars. There was too much paint in the threaded holes and also the tolerances on the machining of the threads was not great. I have included some pictures showing just how much paint was removed from tapping and also chips from burs in the threaded holes from poor tolerance drilling and tapping at the factory. In order to fix this problem I grabbed a tap handle and a M8x1.25 normal thread tap and tapped the holes. I would give this bike a 4.9 out of 5 if I could just because I needed to tap these holes and a tap was not listed as a required tool. I don't think many people will have problems assembling the bike even if they have this issue and need to tap the four holes as these are the only holes that need anything to be screwed into. Honestly if you don't at the very least know how to use a tap and die set you probably shouldn't be assembling a bike as it's not safe to do so if you're not familiar with basic tools. You could wind up hurting your child from pure negligence if you don't know how to use basic hand tools to assemble this bike properly. My suggestion is that you take it to a local bike shop and pay $30-$40 to have them assemble the bike and adjust the brakes if you don't know what you are doing. I assume some people who buy this bike will do just that with the majority of people knowing how basic hand tools work and them being able to assemble it themselves. Overall the bike is amazing, my son loves it, it was extremely easy to assemble, and I recommend you tap the holes on the handlebar binder even if it doesn't need it as it will allow you to make a more secure connection. Please don't listen to people complaining about difficult assembly as it was extremely easy even the detangler brakes something of which I've never seen or dealt with on a bike before. The instructions are very clear on how to hook the brakes up and how to adjust them properly and I was actually surprised how easy it was to assemble the brakes because I was expecting something very difficult based on the reviews but it turns out these brakes are easier to assemble than normal brakes. ... show more
Reviewed in the United States on December 30, 2020 by Dave Dave
    • Great people
Color: Orange Size: 20-Inch Wheels/MAG
Great bike. And during shipping the chain Guard got broken, Pacific Cycle was awesome replacing it quick and friendly. A great shopping experience. Thanks guys
Reviewed in the United States on January 21, 2026 by James Cutsforth
    • Great Purchase!
I had no previous experience with this brand of bikes before this, but bought this and two others as Christmas gifts. Wow!! My kids love these bikes! Well made, easy to assemble, great value. The first day my kids were ready to ride several miles on these bikes. The thicker tires made it easy to go over multiple types of terrain. Everything is just really well made and put together. Super stoked about this purchase and the two others! ... show more
Reviewed in the United States on December 28, 2024 by E. S.
    • Good with a few issues (Legion)
My 8yr old son got the Legion model for Christmas. The assembly wasn't too difficult, but the instructions aren't specific to each model so the exact details are a little vague. The second thing I noticed was that the reflectors are too small to clamp on to this model, so I ordered a generic reflector set to fix. The chainguard was preinstalled but somehow broke on the second day, I removed the guard and the bike works well without it. I was happy that it came installed with a kickstand as that wasn't shown in the image. I also didn't have any trouble adjusting the breaks as others mentioned as a con. Overall I like the bike and think it's a fair value despite my few minor issues. ... show more
Reviewed in the United States on December 27, 2023 by TSM
    • Solid bike older kid/adult
Color: Orange Size: 20-Inch Wheels/MAG
Let me preface this by mentioning I've assembled a number of kids' bikes and have rebuilt my own (mountain) bikes. This is a solid bike I purchased for my 12 year-old (<5') that my 9 year-old is also able to ride as am I (6'). It was pretty easy to assemble (directions were clear) and all parts included; nothing broken/damaged. This model bike, per specs and picture, only has a rear brake which works as expected. My kids are not riding ramps or rails or performing tricks; riding in the street and occasionally off-road at the bmx park (dirt) and if this is what you're using it for, this is a good value in terms of it being the last bike of this type I suspect my kid will own. The one thing I'd mention is that the seat post is bmx-height (low since you're rarely sitting on it); if you plan on using this more for just biking around, invest in a longer seat post (I used a 25.4 x 350mm available elsewhere on the site) -- you can keep the seat and just switch this out. The bike came in an undamaged box; I presume this is the way they all leave the factory -- if yours is damaged on receipt, that's on the delivery company. ... show more
Reviewed in the United States on February 3, 2020 by fells77

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