Mongoose Argus Fat Tire Mountain Bike
- 26 inch wheels, 17-inch frame, fat tires
- 7-speed twist grip shifter, rear derailleur
- Mechanical disc brakes, rigid suspension
- 65 inch minimum rider height
- 42 pounds, alloy steel frame
- Limited lifetime warranty
Last refreshed Jun 21, 2026 · Based on the Amazon listing and published specifications, not hands-on testing.
An adult-size fat tire mountain bike with disc brakes and a simple seven-speed drivetrain. The description belongs to a different, kids version, so rely on the spec table for size.
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ASIN: B086QK46LJCategory: Mountain Bikes
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Overview
Dirt, gravel, sand and snow are the surfaces this Mongoose fat tire bike is pitched at, using wide knobby tires on a rigid frame. A rear derailleur with a twist grip shifter handles the gears, and mechanical disc brakes handle stopping.
Wide tires and disc brakes give it the footing and stopping power for loose surfaces, and a simple drivetrain is easy to maintain. The limitation is that the title covers several sizes and speeds, and the description is written for the smaller kids model.
Who it's for
Riders at or above the stated minimum height who want an easy-handling off-road bike will fit this one. Parents shopping for a child should look at the smaller wheel size version, since this listing's specs describe the large frame.
Pros and cons
- Fat tires for loose terrain
- Mechanical disc brakes
- Simple seven-speed drivetrain
- Twist grip shifting
- Listing mixes several size variants
- Assembly details conflict
Performance notes
Wide tires run at low pressure, which spreads weight over soft ground like sand and snow and adds traction on gravel. Disc brakes keep stopping power consistent in wet weather. A rigid frame transmits trail vibration straight to the rider, so tire pressure does most of the cushioning.
Where it stands among mountain bikes
- #7 most-searched brand and model of the 15 mountain bikes lines we track (by search demand, not sales).
From the specs of the 99 mountain bikes we list; not a test result.
Specifications
| Brand | Mongoose |
|---|---|
| Dimensions & fit | |
| Size | 17-inch framelower than 89% of 47 mountain bikes |
| Wheel Size | 26 inches |
| Minimum User Height | 65 incheshigher than 76% of 38 mountain bikes |
| Item weight | 42 pounds |
| Capacity & performance | |
| Number Of Speeds | 7 |
| Bicycle Gear Shifter Type | Twist grip |
| Construction & materials | |
| Frame Material Type | Alloy steel |
| Color | Copper |
| Warranty & support | |
| Warranty Description | Limited lifetime |
| Other details | |
| Suspension Type | Rigid |
| Brake Style | Mechanical disc |
| Bike Type | Mountain bike, fat tire |
Closest rivals on specs
Frequently asked questions
Is the Mongoose Argus ST a kids bike?
The spec table says no: it lists 26 inch wheels, a 17-inch frame and a 65 inch minimum rider height. The description text is written for a 20 inch kids model.
Does the Mongoose Argus ST need assembly?
The specs say assembly is not required, while the description says assembly is easy with common household tools and an instruction guide. Plan for some setup.
Does the Mongoose Argus ST have gears?
Yes. The specs list seven speeds with a twist grip shifter and a rear derailleur, though the title also mentions a 16 speed option.
Does the Mongoose Argus ST have suspension?
No. The listing gives rigid suspension.