--- product_id: 159739066 title: "Mongoose Legion BMX Bike, Hi-Ten Steel Frame, 25x9T, 36x16T or 40x16T Gearing" brand: "mongoose" price: "$1726.27" currency: USD in_stock: true reviews_count: 13 url: https://www.desertcart.us/products/159739066-mongoose-legion-bmx-bike-hi-ten-steel-frame-25x9t-36x16t store_origin: US region: United States of America --- # 20-inch durable Hi-Ten steel frame Aluminum 36H rims with 2.25” BMX tires Single-speed 25x9T drivetrain with forged steel crank Mongoose Legion BMX Bike, Hi-Ten Steel Frame, 25x9T, 36x16T or 40x16T Gearing **Brand:** mongoose **Price:** $1726.27 **Availability:** βœ… In Stock ## Summary > πŸš€ Own the streets and ramps with the Mongoose Legion L10 – where durability meets style! ## Quick Answers - **What is this?** Mongoose Legion BMX Bike, Hi-Ten Steel Frame, 25x9T, 36x16T or 40x16T Gearing by mongoose - **How much does it cost?** $1726.27 with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.us](https://www.desertcart.us/products/159739066-mongoose-legion-bmx-bike-hi-ten-steel-frame-25x9t-36x16t) ## Best For - mongoose enthusiasts ## Why This Product - Trusted mongoose brand quality - Free international shipping included - Worldwide delivery with tracking - 15-day hassle-free returns ## Key Features - β€’ **Beginner-Friendly Design:** Optimized 20” top tube and 8” rise handlebar fit riders 4'4" to 5'0" for perfect control and comfort. - β€’ **Effortless Power Transfer:** Single-speed drivetrain with 170mm forged steel crank and sealed bearing cassette for clean, efficient pedaling. - β€’ **Built to Last, Ready to Ride:** Hi-Ten steel frame and fork ensure rugged durability for every trail and ramp session. - β€’ **Grip the Terrain with Confidence:** 20” x 2.25” BMX tires on lightweight aluminum rims provide superior traction and resilience. - β€’ **Precision Control at Your Fingertips:** Steel U-brake paired with aluminum/resin levers delivers smooth, reliable stopping power. ## Overview The Mongoose Legion L10 BMX bike features a robust Hi-Ten steel frame with a 20-inch top tube, designed for beginner riders between 4'4" and 5'0". Equipped with a single-speed 25x9T drivetrain and 170mm forged steel crank, it offers reliable power transfer. The bike rides on 20” x 2.25” BMX tires mounted on aluminum 36H rims, ensuring excellent grip and durability. Precision steel U-brakes and aluminum/resin levers provide confident stopping power. With a 5-year frame warranty and 1-year parts warranty, this freestyle BMX is built to last and perfect for entry-level riders ready to own the BMX scene. ## 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. Review: 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. Review: Great bike - My son, absolutely loved this bike when he received it, and it was put together, the bike was perfect for his size. It rode very smooth and I feel like I got what I paid for unfortunately after moving into our new place, the bike was stolen from our backyard ## Features - 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 ## Technical Specifications | Specification | Value | |---------------|-------| | ASIN | B07W7NYH2B | | Additional Features | Aluminum Frame, BMX, freestyle | | Age Range (Description) | Little Kid | | Age Range Description | Little Kid | | Best Sellers Rank | #72,478 in Sports & Outdoors ( See Top 100 in Sports & Outdoors ) #10,593 in Cycling Equipment | | Bicycle Drivetrain Type | Single-speed | | Bike Type | BMX Bike | | Brake Style | U Brake | | Brand | Mongoose | | Brand Name | Mongoose | | Color | Red | | Customer Reviews | 4.4 out of 5 stars 4,149 Reviews | | Derailleur Configuration | Rear | | Electric Assist Type | Manual | | Frame Material Type | High Tensile Steel | | Gear Type | freewheel | | Global Trade Identification Number | 00038675187214 | | Included Components | Mongoose Legion L10 Freestyle BMX Bike | | Intended Riding Terrain | BMX Terrain | | Is Assembly Required | No | | Is Autographed | No | | Item Type Name | Freestyle BMX Bike | | Item Weight | 12 Kilograms | | Manufacturer | Pacific Cycle, Inc. | | Maximum Weight Recommendation | 150 Pounds | | Minimum User Height | 44 Inches | | Model Name | Legion Novice | | Model Number | M41900U20OS-PC | | Model Year | 2020 | | Number Of Speeds | 1 | | Number of Speeds | 1 | | Power Source | manual | | Size | 20-Inch Wheels/L10 | | Specific Uses For Product | Trail | | Style Name | Legion L10 | | Suspension Type | Rigid | | Theme | BMX" or "Freestyle | | UPC | 038675187214 | | Warranty Description | 5-year limited warranty on the frame and a 1-year limited warranty on parts. | | Warranty Type | Limited | | Wheel Material | Aluminum | | Wheel Size | 20 Inches | ## Product Details - **Age Range (Description):** Little Kid - **Bike Type:** BMX Bike - **Brand:** Mongoose - **Color:** Red - **Frame Material:** High Tensile Steel - **Included Components:** Mongoose Legion L10 Freestyle BMX Bike - **Number of Speeds:** 1 - **Special Feature:** Aluminum Frame, BMX, freestyle - **Suspension Type:** Rigid - **Wheel Size:** 20 Inches ## Images ![Mongoose Legion BMX Bike, Hi-Ten Steel Frame, 25x9T, 36x16T or 40x16T Gearing - Image 1](https://m.media-amazon.com/images/I/713yhItci6L.jpg) ![Mongoose Legion BMX Bike, Hi-Ten Steel Frame, 25x9T, 36x16T or 40x16T Gearing - Image 2](https://m.media-amazon.com/images/I/61t7bpg8pVL.jpg) ![Mongoose Legion BMX Bike, Hi-Ten Steel Frame, 25x9T, 36x16T or 40x16T Gearing - Image 3](https://m.media-amazon.com/images/I/61ydzSOTFJL.jpg) ![Mongoose Legion BMX Bike, Hi-Ten Steel Frame, 25x9T, 36x16T or 40x16T Gearing - Image 4](https://m.media-amazon.com/images/I/71m+f59BHOL.jpg) ![Mongoose Legion BMX Bike, Hi-Ten Steel Frame, 25x9T, 36x16T or 40x16T Gearing - Image 5](https://m.media-amazon.com/images/I/61Pf9+sHH0L.jpg) ## Available Options This product comes in different **Color, Size** options. ## Questions & Answers **Q: Is there a way to adjust the distance of the handbrake lever to the handle bar? My sons hands can clasp it safely and the screw on the side doesnt do** A: There is a reach adjustment screw which is a small phillips screw. That'll move that lever closer and further away from the handelbar. Thanks. **Q: It says this typically ships within 1 to 2 months. How soon should I expect this item to actually ship and will it really take up to 2 months?** A: I ordered when it was in stock showed up within 3 days. It could take the whole 2 months, as shipping sucks lately and also the 18" bike has been backordered in multiple brands for a while now. **Q: Can u put a bigger seat on it so it’s easier to sit and pedal?** A: I would say so. It’s a skinny seat for tricks my grandson said. He’s 9. Lol **Q: Why did my bike come with no pedals** A: Hi. We're sorry to hear that. Within the product's one-year limited warranty, we'd be happy to provide replacements for pedals that were missing. We ask you to please reach out to us at 800-626-2811, Monday-Friday 7 am-6 pm CST. We are also available via DM on Facebook, Instagram, and Twitter. Please have your bike’s model number and date code handy. These can be found on a black and silver sticker on the frame above the pedal area. Warm Regards ## Customer Reviews ### ⭐⭐⭐⭐⭐ Extremely Easy to Assemble. Bike Looks Amazing. M8x1.25 Tap May be Needed. *by D***E 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. ### ⭐⭐⭐⭐⭐ Great bike *by L***A on May 29, 2026* My son, absolutely loved this bike when he received it, and it was put together, the bike was perfect for his size. It rode very smooth and I feel like I got what I paid for unfortunately after moving into our new place, the bike was stolen from our backyard ### ⭐⭐⭐⭐⭐ Good quality Bike *by T***S on March 2, 2026* Great Bike for a beginner and a leap above Huffy and Walmart bikes. I remember Mongoose being a Good recognizable brand decades ago. This bike was easy to assemble. I think it took an hour to unbox and put together. Box was damaged heavily, but bike was packed so well with foam and wrapping that there wasn't a single scratch. The most important part is the kid is happily surprised and liked the color. ## Frequently Bought Together - Mongoose Legion Kids Freestyle Sidewalk BMX Bike, Beginner Riders, Boys and Girls, 16-20-inch Wheels, Hi-Ten Steel Frame, Micro Drive BMX Gearing - Zelerdo 2 Pairs Aluminum Alloy Bike Pegs for Mountain Bike Cycling Rear Stunt Pegs Fit 3/8 inch Axles - 80Six Dual Certified Kids Bike, Scooter, and Skateboard Helmet, Designed by Industry Leading Brand Triple 8 --- ## Why Shop on Desertcart? - πŸ›’ **Trusted by 1.3+ Million Shoppers** β€” Serving international shoppers since 2016 - 🌍 **Shop Globally** β€” Access 737+ million products across 21 categories - πŸ’° **No Hidden Fees** β€” All customs, duties, and taxes included in the price - πŸ”„ **15-Day Free Returns** β€” Hassle-free returns (30 days for PRO members) - πŸ”’ **Secure Payments** β€” Trusted payment options with buyer protection - ⭐ **TrustPilot Rated 4.5/5** β€” Based on 8,000+ happy customer reviews **Shop now:** [https://www.desertcart.us/products/159739066-mongoose-legion-bmx-bike-hi-ten-steel-frame-25x9t-36x16t](https://www.desertcart.us/products/159739066-mongoose-legion-bmx-bike-hi-ten-steel-frame-25x9t-36x16t) --- *Product available on Desertcart United States of America* *Store origin: US* *Last updated: 2026-07-23*