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Mongoose Legion Kids Freestyle Sidewalk BMX Bike, Beginner Riders, Boys and Girls, 16-20-inch Wheels, Hi-Ten Steel Frame, Micro Drive BMX Gearing

4.4 4.4 out of 5 stars 3,970 ratings

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About this item

  • 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

From the manufacturer

Mongoose hero with young boy riding a BMX bike women rims mag racing teen seat years redline
Legion BMX Beginner with copy about the bike youth road cycle trike trek orange razor gifts brake

black and blue bike bmx inch bikes kids boys mongoose bicycle girls mountain wheels old men

L10

brown and black bike boy wheel year bicicleta training dirt adult freestyle legion para electric

L20

black blue and brown bike frame tire ages bicycles big black gt adults accessories diamondback

L40

black and silver bike fat parts cruiser bicicletas girl scooter red tires mens age pegskid mini

L60

matte black bike balance toddler blue speed haro trick huffy schwinn cheap se

L100

Customer Reviews
4.4 out of 5 stars
3,970
4.4 out of 5 stars
2,963
4.4 out of 5 stars
2,963
4.4 out of 5 stars
2,963
4.3 out of 5 stars
636
4130 CHROMOLY FRAME TUBE
4130 CHROMOLY FORK/HANDLEBAR
TUBULAR CHROMOLY CRANKS
SEALED CARTRIDGE CRANK BEARING
MICRO DRIVE GEARING
SEALED BEARING REAR HUB
Mongoose 50th BMX

Product Description

For 45 years, Mongoose has been in the dirt, down the trails, and on the ramps. With the Legion Series, Mongoose offers a full line of freestyle BMX bikes for riders of all ages and ability levels. The Legion L10 is designed to be a great introduction into the world of BMX. The Legion L10 features a full Hi-Ten steel frame (20” top tube) and removable break mounts. The L10 Hi-Ten steel 8” rise handlebar and 48mm stem are designed for precision riding, while the aluminum single wall 36H rims and 2.25” BMX tires offer grip and durability. The 25x9T gearing with one-piece tubular chromoly 170 mm hollow spindle cranks and American loose ball bottom bracket offer a clean, reliable drivetrains. A steel U-brake with aluminum/resin brake levers provide speed control, while the Hi-Ten steel BMX fork with 1-1/8" threadless steerer helps maximize performance. This bike ships ready to be assembled and comes with a 5-year limited warranty on the frame and a 1-year limited warranty on parts.

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Customer reviews

4.4 out of 5 stars
4.4 out of 5
3,970 global ratings
Extremely Easy to Assemble. Bike Looks Amazing. M8x1.25 Tap May be Needed.
5 Stars
Extremely Easy to Assemble. Bike Looks Amazing. M8x1.25 Tap May be Needed.
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.
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Top reviews from the United States

Reviewed in the United States on December 30, 2020
Color: OrangeSize: 20-Inch Wheels/MAGVerified Purchase
Customer image
5.0 out of 5 stars Extremely Easy to Assemble. Bike Looks Amazing. M8x1.25 Tap May be Needed.
Reviewed in the United States on December 30, 2020
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.
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22 people found this helpful
Report
Reviewed in the United States on January 13, 2024
Color: Black/TealSize: 20-Inch Wheels/L10Verified Purchase
2 people found this helpful
Report
Reviewed in the United States on March 5, 2024
Color: OrangeSize: 20-Inch Wheels/MAGVerified Purchase
Reviewed in the United States on December 13, 2023
Color: Black/TealSize: 20-Inch Wheels/L10Verified Purchase
Customer image
5.0 out of 5 stars Nice Bike
Reviewed in the United States on December 13, 2023
Fast delivery and good condition of shipment. This bike took less than a hr to build and is very nice from size to comfort and color blends. Very excited to start riding.
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Reviewed in the United States on December 27, 2023
Color: RedSize: 20-Inch Wheels/LSXVerified Purchase
Reviewed in the United States on October 14, 2023
Color: Silver/L18Size: 18-Inch Wheels/L18Verified Purchase
3 people found this helpful
Report
Reviewed in the United States on December 28, 2023
Color: Silver/MagSize: 20-Inch Wheels/MAGVerified Purchase
2 people found this helpful
Report
Reviewed in the United States on December 10, 2023
Color: Black/TealSize: 20-Inch Wheels/L10Verified Purchase

Top reviews from other countries

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andrewsky
5.0 out of 5 stars Para los amantes de BMX
Reviewed in Mexico on February 3, 2024
Color: Black/TealSize: 20-Inch Wheels/L10Verified Purchase
Homero Fraga
5.0 out of 5 stars Excelente calidad
Reviewed in Mexico on January 3, 2024
Color: Silver/L18Size: 18-Inch Wheels/L18Verified Purchase
Costa ganis
1.0 out of 5 stars This bike was used it was sold as used
Reviewed in Canada on July 27, 2022
Color: OrangeSize: 20-Inch Wheels/MAGVerified Purchase
RCA
5.0 out of 5 stars Bicicleta muy bonita de mucha calidad rines de lujo
Reviewed in Mexico on November 19, 2021
Color: OrangeSize: 20-Inch Wheels/MAGVerified Purchase
One person found this helpful
Report
Go0dnessGraci0us
5.0 out of 5 stars Satisfied purchase and kids!.
Reviewed in Canada on April 8, 2021
Color: BlackSize: 20-Inch Wheels/L10Verified Purchase
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Go0dnessGraci0us
5.0 out of 5 stars Satisfied purchase and kids!.
Reviewed in Canada on April 8, 2021
Very easy set up!. Must skip through some of the install instructions as the bike does not have front brakes for install. The bike has a back break only and does not come with front and back foot pegs, we used ours from my son's old bike. I am not sure if it mentions that in the description because to be honest I didn't read the whole description at purchase haha

The bike arrived quickly without damage and is absolutely awesome and sturdy.

My one reccomendation is the bike frame space at the back does not allow a hookup for kick stand... minor setback.
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