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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Availability:
Only 2 left in stock, order soon!
Arrives
Jul 11 – Jul 18
Color: Grey
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: Grey
Wheel Size: 20 Inches
Frame Material: High Tensile Steel
Suspension Type: Rigid
Special Feature: Aluminum Frame, BMX, freestyle
Included Components: Mongoose Legion L20 Freestyle BMX Bike
Bike Type: BMX Bike
Number Of Speeds: 1
Suspension Type: Rigid
Additional Features: Aluminum Frame, BMX, freestyle
Brake Style: U Brake
Specific Uses For Product: Trail
Power Source: Pedal power (human energy transferred through a drivetrain)
Skill Level: Intermediate
Intended Riding Terrain: BMX Terrain, Unpaved Trails, Urban Terrain
Bicycle Drivetrain Type: chain drive
Number of Handles: 1
Color: Grey
Theme: BMX Freestyle
Style Name: L20
Wheel Size: 20 Inches
Size: 20-Inch Wheels L20
Item Weight: 12 Kilograms
Warranty Type: Limited
Is Assembly Required: Yes
Minimum User Height: 48 Inches
Age Range Description: Big Kid
Brand Name: Mongoose
Included Components: Mongoose Legion L20 Freestyle BMX Bike
Model Number: M41800U20OS-PC
Model Name: Legion Intermediate
Model Year: 2020
Global Trade Identification Number: 84
UPC: 038675187184
Manufacturer: Pacific Cycle, Inc.
Warranty Description: Limited lifetime warranty on frame and one year warranty on parts
Unit Count: 1.0 Count
Item Type Name: BMX Freestyle Bike
Frame Material Type: High Tensile Steel
Wheel Material: Aluminum
Seat Material: Fabric or Plastic
Frequently asked questions
If you place your order now, the estimated arrival date for this product is:
Jul 11 – Jul 18
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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Top Amazon Reviews
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.
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Reviewed in the United States on October 24, 2020 by Anonymous
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.
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Reviewed in the United States on December 21, 2020 by HolyShoot
Color: Red
Size: 20-Inch Wheels L20
Received the bike within a week. Assembly difficulty was medium-low. The instruction manual was more general for all Mongoose BMX bikes. The simple order of assembly was: handlebars, brake, seat, wheel, pedals, pegs, (F&R) reflectors. Previous reviews claimed the brake line was a pain to install. Found out the hard way was to install the line into the handbrake right before mounting the handlebar. After everything was installed, i inspected the bike and tightened as necessary. The axel nuts were different sizes in the front and rear and pegs were properly sized for each. The brakes did require adjusting. I used a Park Tool 4th Hand. The tires needed a little bit of air for the recommend 40 psi. Both tires out of box were in the 30s. My son had no problem with this bike. He is 10yo and about 4’9”. This was not his first hand brake so no issues there. His previous bike was an 18” with coasters and hand brakes. He said this bike seems heavy but rides very smoothly. His only complaint is the whistling from the hollow stem bolt while he rides. I have even taken his bike for a few spins and it’s the perfect size and weight for your basic tricks and jumps. I did add a children’s Bell adjustable kickstand but doesn’t appear to last much longer. We want the kickstand because he’s always parking in the garage by the cars and doesn’t like the bike just laying on its pegs. Any questions, please feel free.
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Reviewed in the United States on May 31, 2020 Reviewed in the United States on May 31, 2020 by Amazon Customer
I thought produçts of this size would have been put completely together to be sure that everything would work properly, meaning that the plastic brackets aren't a great idea, saves you money but takes away from quality, plus the rear pegs had no threads so can't be used, I would have given 5 stars but because of some of the parts quality was a let down, overall tho my son loves the bike and he's able to get around much quicker now,, if this is read by support or owners or at least someone who can get the word to the right ppl,, all products might need put together ahead of time and then taken apart and boxed, that way you will be able to fix the issues of pieces that are sub par and pieces that won't work at all,, he is able to use the front pegs if needed,, overall he loves the bike and is very happy, it would have been 10 stars if possible to rate it that, and if the little pieces on the bike that should have been better quality like back when they first came out, paying higher prices sucks, but as long as all the parts are of good quality, plastic is very easy to strip and break, just saying it would be a good idea to think about replacing it all, I also had a mongoose as a child, love the goose and so does my son, thank you for a great bike
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Reviewed in the United States on June 7, 2023 by R. Sams
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.
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Reviewed in the United States on September 23, 2025 by Joel
Color: Grey
Size: 20-Inch Wheels L60
Let me be up front, I paid $179 for this bike. It is the gray L60. I just looked again and the bike is now listed for almost $350. I’m not sure I would pay that for this bike. Not because it’s not worth that, but because I would probably buy a higher end brand for the same price. But, that’s just me. I bought this for my son on his 9th birthday. He is very tall for his age at a little over 5 feet. According to the specs, he would be on the bottom end of the height range for this bike and it fits him perfectly. I am 6’ 2”, 250 pounds and I wouldn’t hesitate to buy this bike for myself based on the dimensions. The handlebars are a really nice height for me to ride. I could not find out what the exact material the frame is, but it is very light. I was hoping to get him a Chromoly frame, and I would say that this would fit in that weight range. Everything is very stout and tight. I would not personally hesitate to take this bike to the park and jump it… Which I did. The crank did not flex at all, and I really love how fat the tires are. All around, I am impressed with the bike. The paint job had a nice detail in it near the welds to mimic a heat blemish, which is a throwback to the old days, when chrome bikes were welded and the heat would blemish the chrome and turn it a rainbow color. The only Cons that I really found with the bike was under the fork where the neck stem passes through the fork and is welded in place, there was a really bad cut and weld. There are also a hint of rust on a few parts of the bike. I’m assuming from being shipped overseas from China. The metal Mongoose decal for the front of the head stem was a stick on thing. It may be that kids these days want a clean look and they did that as an option. Other than those things, I can’t find anything else mechanically or geometrically wrong with the bike. To be clear, this is not a Walmart licensed product. This is a mongoose bike produced by mongoose or the company that owns mongoose. p.s. it wouldn’t be a bad idea to make sure that the neck, crank and wheel hubs are all at the correct tightness. They feel a little tight out of the box. This is super easy to do yourself, but if you’re unsure, just take it to a bike shop.
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Reviewed in the United States on May 25, 2023 Reviewed in the United States on May 25, 2023 by A & R
Please when ordering this bike have a professional check the breakline and break handle before letting your child or loved one ride it. My 11 year old son worked very hard for several months saving up money to purchase this bike only to be let down twice and end up with some pretty bad concrete burn on his knees, elbows and hands. We are on our second bike of this model because the first ones break line was too short to finish assembly so Amazon picked that one up and sent us another one. (that arrived 2 days later then promised) When we received the second one we were able to complete assembly but when my son tried to ride it for the first time he had a pretty bad crash caused from the faulty breakline. When he tried to pull the break handle the breakline ripped through the handle which caused the breaks not to work and since he was unable to stop the bike he crashed. I took the bike to the same bike shop I had taken the first one and they said that the bike was assembled correctly and that they were able to see where the breakline ripped through the break handle and that should not have ever happened. They also sais that since this was the second bike that I had brought to them with this same issue that there must be something wrong at the manufaturer with the breaklines for this bike model. So again, if you purchase this bike make sure you check and double check the safety features on this bike before anyone rides it.
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Reviewed in the United States on April 8, 2019 by MommyX3
Color: Green
Size: 20-Inch Wheels L60
Just get one. This is Mongoose like in the 80's and early 90's. Not the junk crap that Walmart and other department stores still sell. Avoid those like the plague! But then, that's apparent to any real BMX rider. Those are all flash for what little you pay and no real quality. If you already have one of those, strip it down to the bare frame and only the frame and build everything else up from scratch. That's those bikes only hope. This on the other hand is fine the way it comes. Ok, may have to make a few tweaks and whatnot along the way, but that's to be expected of even the best BMX bikes. It's part of riding and making it your own. I do wish they'd have given it at least a somewhat taller seat post, and I'm also not crazy about how the seat is permanently attached to the seat post as well. Normal seat and seat post setup is, if the seat wears out or isn't to your liking, you can just stick a new seat on the seat post. Here, you have to replace both. Was expecting something like a pivoting seat post or perhaps the old bolt down kind. On the other hand, the seat that's here, by BMX standards, is plenty acceptable until I upgrade. I got the L60 and I'm not sure it mentions it in the details, but it appears as though it's sporting a rear wheel that's sealed while the front wheel is not sealed. But the L60 is totally the midrange offering of the whole Legion lineup. So it's expected that a few things are somewhat average, besides, the rear wheel is where you want and need a better quality one at, uh, if you're going to cut corners that is. Also, contrary to what I'm seeing in other reviews here, the brakes do work surprisingly well. More than adequate. The bike arrived perfectly and overall inspection found one very minor blemish. Top tube on left side has like a weird smudge in the paint job that then glossed over for it's final painting. I tried Goo Gone thinking it might have just been grease, it's kind of a blackish color against green giving that effect sorta, but after a good rubbing it remains unchanged, so I can tell it's permanently on there. Both very minor and totally cosmetic, a classic error no doubt the result of being mass produced. Everything else is brilliant here plus I caught a sweet sale on mine and got it for only $146.87 + tax. Arrived quickly, packaged well, everything is in perfect condition, so yeah, I'll excuse one little minor smudge. Thank you Mongoose!!!!
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Reviewed in the United States on May 2, 2023 by Matt Jacoby