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🚀 Own the streets with the Mongoose Legion L20 — where style meets unstoppable freestyle power!
The Mongoose Legion L20 is a 20-inch freestyle BMX bike engineered for intermediate riders between 4’8” and 5’4”. Featuring a rugged Hi-Ten steel frame, precision 25x9T BMX gearing, and durable aluminum rims with 2.3” tires, it’s built to handle street, park, and dirt riding. With reliable U-brakes, a 170mm forged steel crankset, and a 5-year limited frame warranty, this bike offers a perfect blend of performance, durability, and value for young riders ready to push their limits.















| ASIN | B07W5KNZZX |
| Additional Features | Aluminum Frame, BMX, freestyle |
| Age Range (Description) | Big Kid |
| Age Range Description | Big Kid |
| Best Sellers Rank | #49,496 in Sports & Outdoors ( See Top 100 in Sports & Outdoors ) #6,938 in Cycling Equipment |
| Bicycle Drivetrain Type | chain drive |
| Bike Type | BMX Bike |
| Brake Style | U Brake |
| Brand | Mongoose |
| Brand Name | Mongoose |
| Color | Grey |
| Customer Reviews | 4.4 out of 5 stars 3,198 Reviews |
| Frame Material Type | High Tensile Steel |
| Global Trade Identification Number | 00038675187184 |
| Included Components | Mongoose Legion L20 Freestyle BMX Bike |
| Intended Riding Terrain | BMX Terrain, Unpaved Trails, Urban Terrain |
| Is Assembly Required | Yes |
| Item Type Name | BMX Freestyle Bike |
| Item Weight | 12 Kilograms |
| Manufacturer | Pacific Cycle, Inc. |
| Minimum User Height | 48 Inches |
| Model Name | Legion Intermediate |
| Model Number | M41800U20OS-PC |
| Model Year | 2020 |
| Number Of Speeds | 1 |
| Number of Handles | 1 |
| Number of Speeds | 1 |
| Power Source | Pedal power (human energy transferred through a drivetrain) |
| Seat Material | Fabric or Plastic |
| Size | 20-inch Wheels L20 |
| Skill Level | Intermediate |
| Specific Uses For Product | Trail |
| Style Name | L20 |
| Suspension Type | Rigid |
| Theme | BMX Freestyle |
| UPC | 038675187184 |
| Unit Count | 1.0 Count |
| Warranty Description | Limited lifetime warranty on frame and one year warranty on parts |
| Warranty Type | Limited |
| Wheel Material | Aluminum |
| Wheel Size | 20 Inches |
A**S
Great quality bike and light weight
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.
H**T
Good bike for the money
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.
A**R
MNG Legion L20 (Red): Excellent Bike!
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.
R**S
Great bike,
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
J**L
Best bike around. My 10 Yr Old loves it.. I used to BMX and better than my bikes.
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.
M**3
Must Have a Faulty Break Line!!
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.
A**R
Great Quality for the price!
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.
R**.
5 Star Mongoose BMX Bike
Had a Mongoose as a kid and it was only right to get my son one
V**M
For beginners is good
This is not professional bike for sure but for beginners its ok
A**E
Hält sogar Autos stand
Die Montage war sehr einfach und unkompliziert. Ich bin nun schon seit 4 Monaten fast täglich mit dem BMX unterwegs, mache aber keine Stunts damit (so krass bin ich nicht :D ) und es fährt sich einfach fantastisch. Meine Hoffnung, ein robustes Rad zu erhalten wurde auch bestätigt, denn das BMX hat einen Unfall mit einem Auto (Auto hat Rad von der Seite mit ca 20 km/h erfasst) ohne Schäden überstanden, bei mir war mehr kaputt. Der Reifen war leicht verkratzt (das Auto hat das Rad min 15m weit mitgeschliffen) und das Pedal war deutlich abgeschliffen, davon abgesehen nichts! Für mich beeindruckend. Geiles Rad :D
F**O
Bici formidabile
Bellissima
F**E
For the price, it’s real good
I got it retailed for quite of a good deal below $400. And I’ve been using this BMX for a solid 3 months here and there and it doesn’t really disappoint, as long as you greased the metal parts, it’s smooth as butter The instructions on the brakes could and bearings of the handle could be more accurate and clearer though And the bikes itself seems to be a little heavier than a typical BMX. That’s the only issue I ahve with it, the weight. But nonetheless it’s overall a decent bike
M**A
Bicycle
My parcel arrived today not knowing it is broken
Trustpilot
2 weeks ago
1 day ago