Mongoose Legion Freestyle BMX Bike
- Wheel Size: 20 inches
- Minimum User Height: 66 inches
- Bike Type: BMX Bike
- Intended Riding Terrain: BMX Terrain, Unpaved Trails, Urban Terrain
Last refreshed Jun 21, 2026 · Based on the Amazon listing and published specifications, not hands-on testing.
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ASIN: B07W5KNZZVModel: Legion L80Category: BMX Bikes
Overview
An adult-size freestyle BMX bike from Mongoose's Legion line, built around a 4130 chromoly front triangle, fork and handlebar with a 20.75 inch top tube. Suggested for riders 5'6" to 6'0" doing park, street or dirt riding.
Assembly and shipping condition varied by report, with some bikes arriving scratched or with a broken chain guard.
- 4130 chromoly frame, fork and handlebar
- 20.75 inch top tube, sized for riders 5'6 to 6'0
- 20 x 2.3 inch tires on aluminum single-wall rims
- Aluminum U-brake with removable brake mounts
Who it's for
Fits intermediate to advanced freestyle riders around 5'6" to 6'0" who want a chromoly frame to build on.
Pros and cons
- Full 4130 chromoly frame, fork and bars, a genuine upgrade base
- Double wall rims and a sealed rear hub on some units
- Quality control varies: reports of scratched paint and a broken chain guard on arrival
- Low gearing makes off-pavement pedaling difficult
- Heavier build than some riders expect for park use
- Seat height adjustment is fiddly due to a covered bolt hole
Specifications
| Brand | Mongoose |
|---|---|
| Model | Legion L80 |
| Dimensions & fit | |
| Wheel Size | 20 inches |
| Minimum User Height | 66 inches |
| Item Weight | 26.46 pounds |
| Capacity & performance | |
| Bicycle Drivetrain Type | Single Speed |
| Number Of Speeds | 1 |
| Age Range Description | Big Kid |
| Power & efficiency | |
| Power Source | Manual |
| Construction & materials | |
| Frame Material Type | Chromoly Steel |
| Wheel Material | Aluminum |
| Seat Material | Leather |
| Color | Red |
| Included components | |
| Unit Count | 1 |
| Included Components | Mongoose Legion L80 Freestyle BMX Bike |
| Warranty & support | |
| Warranty Description | Limited lifetime |
| Warranty Type | Limited |
| Other details | |
| Bike Type | BMX Bike |
| Intended Riding Terrain | BMX Terrain, Unpaved Trails, Urban Terrain |
| Brake Style | U Brake |
| Gear Type | cassette |
| Skill Level | Advanced |
| Suspension Type | Rigid |
| Is Assembly Required | Yes |
| Number of Handles | 2 |
| Is Autographed | No |
| Additional Features | Aluminum Frame, BMX, Freestyle |
| Style Name | L80 |
| Specific Uses For Product | Trail |
| Item Type Name | BMX Bike |
Closest rivals on specs
Frequently asked questions
Who is the Mongoose Legion Freestyle BMX bike sized for?
The listing suggests riders between 5'6" and 6'0", based on the 20.75 inch top tube.
What frame material does the Mongoose Legion use?
A 4130 chromoly front triangle, fork and handlebar, with removable brake mounts and a mid bottom bracket shell.