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Mongoose

Mongoose Legion Kids Freestyle BMX Bike, Intermediate Rider, Boys and Girls Bikes, 20-Inch Wheels, Hi-Ten Steel Frame, Micro Drive 25x9T BMX Gearing

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Condition: New
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Availability: In Stock.
Fulfilled by Amazon
Arrives Wednesday, Nov 12
Order within 10 hours and 14 minutes
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Color: Red


Size: 20-Inch Wheels L20


Features

  • L20 is a stylish freestyle BMX bike that offers everything a beginning rider needs to hit the streets and pop off curbs, Suggested rider height is 48-54
  • Built to last with its Hi-Ten steel frame, removable brake mounts, and a top tube length of 20.25 inches
  • Boasts a high-performance drivetrain equipped with 170mm one-piece forged steel cranks, a 25T alloy chainring, and an American loose ball bottom bracket
  • Wheelset is equipped with 20 x 2.3 tires mounted on aluminum single 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 Hi-Ten steel handlebar and fork are joined by a 50mm stem and threadless sealed integrated headset for maximum steering performance

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 L20 was designed to be a fully park, street and dirt worthy BMX bike. The Legion L20 features a Hi-Ten steel frame (20.25” top tube), tapered headtube, and removable brake mounts. The L20 Hi-Ten steel 8” rise handlebar and 48mm stem are designed for precision riding, while the wide aluminum single wall 36H rims and 2.3” BMX tires offer grip and durability. The 25x9T gearing with one-piece tubular chromoly 170mm hollow spindle cranks and American loose ball bottom bracket offer a clean, reliable drivetrains. An alloy U-brake with alloy brake levers provide speed control, while the Hi-Ten Steel BMX fork with 1-1/8" threadless steerer and taper leg 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.

Bike Type: BMX Bike


Age Range (Description): Big Kid


Brand: Mongoose


Number of Speeds: 1


Color: Red


Wheel Size: 20 Inches


Frame Material: Alloy Steel


Suspension Type: Rigid


Special Feature: Aluminum Frame, BMX, freestyle


Included Components: Bicycle


Bike Type: ‎BMX Bike


Age Range (Description): ‎Big Kid


Brand: ‎Mongoose


Number of Speeds: ‎1


Color: ‎Red


Wheel Size: ‎20 Inches


Frame Material: ‎Alloy Steel


Suspension Type: ‎Rigid


Special Feature: ‎Aluminum Frame, BMX, freestyle


Included Components: ‎Bicycle


Size: ‎20-Inch Wheels L20


Brake Style: ‎U Brake


Specific Uses For Product: ‎Trail


Item Weight: ‎34.4 Pounds


Style: ‎L20


Model Name: ‎Legion Intermediate


Power Source: ‎Pedal power (human energy transferred through a drivetrain)


Wheel Material: ‎Aluminum


Seat Material Type: ‎Plastic


Warranty Type: ‎Limited


Assembly Required: ‎Yes


Global Trade Identification Number: ‎15


Minimum User Height: ‎48 Inches


UPC: ‎038675158115


Manufacturer: ‎Pacific Cycle, Inc.


Item Package Dimensions L x W x H: ‎48.03 x 23.23 x 9.06 inches


Package Weight: ‎16.86 Kilograms


Item Dimensions LxWxH: ‎23.62 x 8.66 x 48.82 inches


Brand Name: ‎Mongoose


Warranty Description: ‎limited lifetime


Material: ‎steel


Suggested Users: ‎unisex-child


Number of Items: ‎1


Part Number: ‎M41509M50OS-PC


Date First Available: July 29, 2018


Frequently asked questions

If you place your order now, the estimated arrival date for this product is: Wednesday, Nov 12

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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Top Amazon Reviews

    • Best bike around. My 10 Yr Old loves it.. I used to BMX and better than my bikes.
Color: Grey Size: 20-Inch Wheels L60
This bike is Amazing. And even though I got it Used it came in Mint Condition still in the Box. Great Seller. My 10 Year old Daughter wanted a good Boys Bike and this one is outstanding. Much better than the Mongoose I had in 1984. I had to pull the handlebars back a little bit for her. Brakes are real good to compared to most that come on the bike. I think if you can get this for under $250. It's a steal. ... show more
Reviewed in the United States on September 23, 2025 by Joel
    • Great quality bike and light weight
Color: Blue Size: 20-Inch Wheels L20
This Legion L20 is the third Mongoose BMX bike I've purchased over the last year, and I've been very happy with all three (Legion LSX, Title Pro, and L20). Assembly was very easy on all three bikes; just need to attach the front wheel, handle bars, and pedals. Took only about 15 mins. You just need to pay attention to the direction of the forks and remember the left pedal will be left-hand threaded. The forks and pedals have stickers denoting front/rear, left/right. Besides adjusting for height and putting air in the tires, there really wasn't any need for fine adjustments (chain tension, brakes, misc. nuts, etc.), as these things are being adjusted correctly from the factory (nice surprise). After reading the negative reviews on this bike and the others mentioned, it seems many of them are related to incorrect user assembly. If you put the forks on backwards or don't put air in the tire, you're going to have problems. The Legion L20 is reasonably light at roughly 25 lbs., easy to ride, and looks great. Note, however, that this is a freestyle bike, and probably not the best choice if you're just looking for a neighborhood cruiser. The crank bracket sits about 1" higher than on a race type BMX bike, making the apex pedal feel too high when in a sitting position. This may not bother some people. If it does, you could buy shorter cranks, but with the money you'd spend, it would be more logical to just go with a race style bike with the lower bracket (and larger front sprocket). The Title series with a lengthened seat post makes for a great lightweight cruiser. Not much to complain about on this bike. Excellent quality for the money. If you're looking for a reasonably priced freestyle bike with good quality, at $156, this is a great choice. ... show more
Reviewed in the United States on October 24, 2020 by Anonymous
    • Good bike for the money
Color: Red Size: 20-Inch Wheels L20
All you need are some tools, a brain, some patience and reasonable expectations for this to be put together and on the road. If you have half a brain and basic tools, you’re going to be able to put this together without even looking at the instructions. This will come in a box, front tire packaged off. It comes with no tools, everything zip tied so it could remain intact on the long trip from CHIIIINA to the US. Packaging is solid. There are several thick zip ties to cut to break everything loose. You’re going to need: Metric hex tools A 15 and 18 mm socket for axels 15mm wrench or socket to tighten handlebar alignment Scissors or utility knife for zip ties Phillips screwdriver (for the reflectors only) You’ll need an extension bar to remove the nuts from the axels to install the pegs on front and back. Will take you about 60 seconds to do this. Front handlebars install with hex keys. Honestly not sure how anybody could have problems with this. It’s four bolts. Secure them, and you’re good. But man, some reviewers couldn’t figure this out. Install the seat with another hex socket. Put on the reflectors, hook up the brake, fill the tires with air, and you’re riding. Btw, the factory purposefully ships tires with less air than you’ll need for your benefit. Any tire sitting for an extended period will last longer if not fully inflated. Hooking up the brake is a bit of a pain in the A, as you won’t have enough slack in the front to properly attach the cable unless you briefly disconnect the rear brakes. Once you pull the cable through in the front to attach, reattach the rear. Took me a minute to figure this out. The front break setup is such that you can spin the handlebars around to 1) look cool, and 2) not have the brake line get wound around the front of the bike. The bike is good, solid and worth the money. Assembly, with any mechanical skill (even entry level mechanical skill) will take 20 minutes. Also, warning: you’re buying a $200 bike. It will last like a $200 bike. Many people on here complain about the quality. This isn’t a $1000 bike. Don’t pretend it is. Take care of it, don’t beat it to death and you’ll be good. If this was at all helpful, please hit the button. ... show more
Reviewed in the United States on December 21, 2020 by HolyShoot
    • Mongoose, still a good bicycle.
Color: Black Size: 20-Inch Wheels L20
Item arrived early! My 11 year son, roughly 75lbs loves the bike. It fits him well. We built it up in less than 1 hour. The brake ( rear cable break) is not very good so most people may end up completely swapping it out for a upfgraded version. I ended up having to take the bike to the local bike shop to see if their mechanic could get the break adjusted correctly and he improved it slightly but its still will not grab the tire and fully stop it. If he is going down a hill the bike brake will NOT stop the tire. the brake pads continually slid along the rim when depressed only slowing the bike. I am considering sanding the rim with 220 grit to see if a rough or milled type edge might create more friction for the pads to grab. I have not done that yet, because I wanted to see if the brakes work better after a break in period. The mechanic speculated that since the rim was not milled and the black paint on the rim was slick, it caused slippage. Over all the rest of the components are decent for bike that was under $250. ... show more
Reviewed in the United States on February 5, 2025 by Timothy M.

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