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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

Based on 3,135 reviews
Condition: New
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$499.99

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At a glance

Condition
New
Color
White
Size
20-in Wheels L20
Model
M41801U10OS
Dimensions
24.41 x 9.06 x 53.15 in
Weight
12 kg
Material
Steel
In the box
[BikeBMX PedalsChainBicycle SeatU-BrakeBrake LeversHandlebarForkStem1-1/8 inch HeadsetThree-piece Forged Steel CranksChainringBottom BracketFront HubRear SpokesDouble Wall Aluminum RimsTires]
Warranty
Limited Lifetime

Features 5

  • 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

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.

Specs 32

Bike Type BMX Bike
Age Range (Description) Big Kid
Brand Mongoose
Number of Speeds 1
Color White
Wheel Size 20 Inches
Frame Material Alloy Steel
Suspension Type Rigid

Frequently asked questions

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Yes, absolutely! You may return this product for a full refund within 30 days of receiving it.

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View our full returns policy here.

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Top Amazon Reviews

Great Quality for the price!
Color: Grey Size: 20-Inch Wheels L60
Review Image by A & R A & R
Review Image by A & R A & R
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. ... show more
Reviewed in the United States on May 25, 2023 by A & R A & R
Good quality!
Color: Black Size: 20-Inch Wheels L20
My nephew loves his bike. Very easy to assemble at all pieces came undamaged and in good order. Pretty solid bike so far!!
Reviewed in the United States on March 15, 2025 by Ken Olsen
Better than anything at Walmart
Color: Green Size: 20-Inch Wheels L60
Review Image by Jessey Jessey
Great BMX bike that is miles above anything found at Walmart. I will say I purchased this on sale making the price $168 before tax. For that price, nothing compares. I will say either wait for a sale again, because if I had to pay full price at $238… I might have went a different route. The frame, bars, and cranks seem like very high quality. The wheels seem like they could be better but those could easily be upgraded down the road when my son needs them. ... show more
Reviewed in the United States on March 22, 2025 by Jessey Jessey
Great bike,
Color: Black Size: 20-Inch Wheels L20
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 ... show more
Reviewed in the United States on June 7, 2023 by R. Sams
L60 Grey! Best Value BMX while it lasts!
Color: Grey Size: 20-Inch Wheels L60
Was looking to get back into BMX. I mean I'm buying a BMX for my 5yo son (wink). Just wanted something like I had in the 90s. Everything was $200 and above. Walmart has a Mongoose Rebel X1 for $182 that I almost bought. Then suddenly, as if reading some kind of chip implanted in my brain, or device, Amazon shines light on the Mongoose Legion Intermediate L60 in Grey for $153. The listing photo does not match and shows a L20 grey but the listing "Part Number" comes back as the proper L60 in grey and is what you get. I wait and the price goes to $155 but with a 20% off coupon. No brainer from there. The Legion 60 is an upgrade from the Rebel X1 which I match most to the Legion 20 from what I can verify and see in photos. The L60 has a sealed rear hub and sealed head design that makes it superior to the L20 and the L40 which had a sealed rear hub. The L60 does not come with pegs but the front axle will accept 3/8 pegs or the Mongoose Freestyle Steel Pegs. The rear axle is 14mm so you need larger diameter pegs for the rear. The rear-axle has plenty of thread left for pegs. The seat tilt is fixed. The head part of the frame already has slots ready for a gyro brake system but the L60 does not have the system installed. The frame is Hi-Ten steel which I don't mind and is what I had back then anyway and you cant really find chromoly frame builds for less that $300. $130.37 out the door on this bike for what it has is a super duper deal. It is made in China but for an OEM bike, I could never build something like this for that price. A frame and maybe wheels without tires is most I'd get under $150. Congrats to all who got the L60 in grey at a great price. Thanks Amazon for the super ai deals and Mongoose for still making and baking. ... show more
Reviewed in the United States on January 28, 2024 by Jack
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