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Mongoose

Mongoose Argus Trail or ST Fat Tire Mountain Bike, 20, 24 or 26 Inch Bike for Kids and Adults, 7 or 16 Speed, Aluminum or Steel Frame, Knobby Mountain Fat Tires, Mechanical Disc Brakes

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Availability: Only 3 left in stock, order soon!
Fulfilled by e-Global Consulting
Arrives Jun 5 – Jun 11
Order within 16 hours and 59 minutes
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Style: St


Color: Grey


Size: 20"


Features

  • KIDS MOUNTAIN BIKE: A world of adventure awaits with the Argus Trail by Mongoose. Featuring 20-inch wheels, this bike is perfect for kids from 4'3" - 5' tall. Built for youth riders on challenging terrains, this bicycle brings kids in on the fun.
  • BORN IN DIRT: Lightweight yet durable with an aluminum frame, this girls and boys mountain bike is ready to tackle varied terrain and keep up with adventurous young riders.
  • BUILT FOR ADVENTURE: This Mongoose kids bike is ready to roll with massive 4-inch-wide fat tires that grip dirt, gravel, sand, snow and more. Designed for ultimate traction, this mountain bike features aluminum rims for a smooth ride.
  • SHIFT INTO GEAR: This 16-speed bike boasts a Shimano 2x8 drivetrain for smooth shifting and the right gear for your ride. Mechanical disc brakes provide reliable stopping power in varied conditions, giving young riders control on rough terrain.
  • KNOW YOUR ROOTS: As one of the OGs in BMX and action sports, Mongoose has helped bring this movement to the world. For over 50 years, we've been all about epic products and pushing limits and we're just getting started.

Description

Adventure starts where the pavement ends with the Mongoose Argus Trail, a kids fat tire mountain bike built for all-terrain fun. With 20-inch wheels, this boys and girls mountain bike is ideal for riders between 4'3"" - 5', perfect for bringing young explorers into the action. Its aluminum rims and 4-inch- wide fat tires provide the traction and durability needed to conquer dirt, gravel, sand, and snow with confidence. The lightweight yet tough aluminum frame is easy to handle while delivering big-time performance. Equipped with a Shimano 2x8 drivetrain, this 16-speed bike ensures smooth shifting and a wide gear range for tackling varied terrain. Mechanical disc brakes provide reliable all-weather stopping powers, keeping kids in control no matter the ride. Whether climbing hills, cruising the trail, or charging through the elements, the Argus Trail is ready for the adventure. Assembly is easy with a few common household tools and the included instruction guide. At Mongoose, we know our roots – as pioneers in BMX and action sports for over 50 years, we're dedicated to delivering an epic ride every time. Get ready to push the limits.

Bike Type: Mountain Bike


Age Range (Description): Adult


Brand: Mongoose


Number of Speeds: 7


Color: Grey


Wheel Size: 20 Inches


Frame Material: Alloy Steel


Suspension Type: Rigid


Special Feature: fat tire, mountain bike


Included Components: Bike


Bike Type: Mountain Bike


Number Of Speeds: 7


Suspension Type: Rigid


Additional Features: fat tire, mountain bike


Brake Style: Disc


Specific Uses For Product: Trail


Power Source: Pedal power


Bicycle Gear Shifter Type: Twist Grip


Skill Level: Beginner to Intermediate


Intended Riding Terrain: Mountain Terrain, Unpaved Trails


Derailleur Configuration: Front and Rear


Bicycle Drivetrain Type: Derailleur


Is Autographed: No


Number of Handles: 1


Color: Grey


Style Name: St


Frame Material Type: Alloy Steel


Wheel Material: Hi-Ten steel


Age Range Description: Adult


Brand Name: Mongoose


Included Components: Bike


Model Number: R1972AZ


Model Name: Argus


Model Year: 2021


UPC: 038675223646


Manufacturer: Pacific Cycle, Inc.


Warranty Description: Limited Lifetime


Unit Count: 1.0 Count


Item Type Name: Fat Tire Bike


Wheel Size: 20 Inches


Size: 20"


Item Weight: 30 Pounds


Warranty Type: Limited


Maximum Weight Recommendation: 200 Pounds


Is Assembly Required: No


Minimum User Height: 48 Inches


Frequently asked questions

If you place your order now, the estimated arrival date for this product is: Jun 5 – Jun 11

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

To initiate a return, please visit our Returns Center.

View our full returns policy here.

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Leasing options through Acima may also be available during checkout.

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Similar Products

Top Amazon Reviews

    • Great Bike Kids love them
Style: St Color: Blue Size: 24"
Great Bike has lasted 5 years and going strong
Reviewed in the United States on January 1, 2026 by Amazon Customer
    • 17 inch argus st model highly recommend
Style: St Color: Copper Size: 17-Inch Frame
Review Image by Lee
Review Image by Lee
So far on day 1 it gets 5 stars. Arrived on time without any damages. Assemhly was very easy insert the seatpost/seat, bolt on the front tire, attach your right and left pedals which come with labels because your left pedal is threaded opposite so lefty tighty, righty loosy the right pedal is standard righty tighty. I am about 5,10 185 pounds and the 17 inch frame fits me perfectly! Had to slightly adjust the front break pads to eliminate a slight rub on the rotors but it wasn't hard at all. Out of the box the shifter needed 0 adjustment and shifts very smooth however it is a grip shifter so its a little easy to accidentally shift gears when you aren't trying to. Other than that the bike is very solid and rides very nice the brakes aren't amazing but its easy to swap your brake pads down the road. All in all i highly recommend this bike. ... show more
Reviewed in the United States on August 10, 2025 by Lee
    • Fun to ride and feels safe and strong on the road
Style: St Color: Copper Size: 17-Inch Frame
Review Image by Mike Nova
Great bike looks beautiful in person feels smooth on the road everything came no missing parts easy to assemble and very fun to ride!
Reviewed in the United States on December 17, 2025 by Mike Nova
    • Great entry fat bike, but tires need deeper tread
Style: St Color: Copper Size: 17-Inch Frame
Review Image by C
Review Image by C
This bike is a good value for the money, and I would buy it again as a entry level fat bike for my child getting into fat biking with me. However it’s not perfect. 1) assembly is not easy. If you don’t have experience assembling a bike it will be tough for you. After I assembled it, the shifting had to be adjusted quite a bit which someone unfamiliar with these adjustments would be totally lost. Same with the disc brakes rubbed badly and I had to adjust the placement of them. 2) it is very heavy, just know that. Comes into play when transporting on a bike rack or climbing an incline, especially for a teen getting into biking. 3) the fat tires are 4.0” wide which is nice, but the tread depth is not very deep. This translates to not the best grip on snowy trails. I’d say maybe half the depth of the tread knobs compared to what came on my Trek Farley fatty. My son slipped out and fell 3-4 times in areas I have grip for days on my bike. But new tires are very expensive, at least $100/tire, so upgrading tires on this price-point bike is hard to justify. If it came with knobbier tires it would be an extremely excellent entry snow bike!! 4) it is very good looking and I’d recommend it for a cheap intro into fat biking. But be weary of the tires if you’re using it on groomed snow trails, but it’s cool! ... show more
Reviewed in the United States on January 5, 2021 by C
    • Great ride despite uncomfortable seat
Style: St Color: Copper Size: 17-Inch Frame
The bike rides so smooth, going off road or path is not an issue at all! The only problem is the seat, it hurts to sit on and the next day you will feel sore. This is not a big deal though just switch it out for a better seat.
Reviewed in the United States on March 14, 2026 by James Sanchez
    • Buy local if you can
Style: St Color: Copper Size: 17-Inch Frame
Review Image by Leonardo
Review Image by Leonardo
Review Image by Leonardo
The bicycle was super easy to assemble. Things that went wrong: 1- Delivery driver left the box upside down, clearly the side on the ground was labeled this side UP 2- The moment I moved the box I got a bad feeling. Parts inside were loose. I opened the box and some of the plastic covers were BENT and destroyed because the box was possibly laid flat. The box is clearly labeled DO NOT LAY FLAT. 3. Gear derailleur is completely bent, again from the box being laid FLAT. 4. Front caliper damaged due to being laid FLAT 5. One pedal stud is cross threaded so I cannot install one of the pedals. Overall, a delivery from hell. Very disappointed and sad that I don’t get ride this weekend. ... show more
Reviewed in the United States on July 7, 2022 by Leonardo
    • love it
Style: St Color: Copper Size: 17-Inch Frame
Review Image by Marcus Thomas
Amazing bike, so glad I got this for my daily rides, great brakes as well, perfect size for me.
Reviewed in the United States on September 5, 2025 by Marcus Thomas
    • I DON'T KNOW RICK... LOOKS FAKE TO ME
Review Image by Loliaz
Review Image by Loliaz
Review Image by Loliaz
Ok, here I go.... I don't know where to start. I had pretty high good expectations with this bike. It is certainly a very nice looking bike but.... one of the things I decided to buy this one was because in the description says ITEM WEIGHT 30 LBS. No, isn't. It is almost 37 Lbs. It was pretty easy to assemble but it needs some adjustments anyway by a professional; the chain and speed changes, is not getting the most little disc. I tested it today, did a ride around 10miles. The last 2 miles the pedals had a weird sound combined with some other weird sounds in the chain. The brakes sounds sandy from the very beginning. It has some peelings with some sharp liftings all around the metal rim in both wheels. Looks like whoever did mount the wheels, they did a sloppy job; they used a sharped tool that lifted the black coating and left exposed the metal. Just because of this, I think I'll be returning this Bike. See pictures attached from both wheels. I'll keep testing it a little bit more and let you know guys what else. ... show more
Reviewed in the United States on August 7, 2023 by Loliaz

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