First Look: 2015 Mongoose Argus – alloy framed fat bike

26er Fat Bike

Mongoose Argus fat bike

Mongoose has been making budget fat bikes for the past year or so and it all started with their Beast model. The fact that one could buy a fat bike for under $200 (not at your local bike shop, but at “big box” store) was the subject of much debate. Was it trail worthy? Would it break on the first ride? Could you upgrade it? Could you race it? (Manuel Beastley, anyone?)

The steel framed Beast was cheap and heavy and its geometry was more suited for beach cruising than trail ripping. So Mongoose followed up the Beast with a new model earlier this year called the Dolomite. Again, much debate was waged. The Dolomite was also steel and still heavy, but with slightly better geometry, disc brakes, and gears (and a bit higher price). There is a good discussion (with photos) about the Dolomite in our forums here: http://forums.mtbr.com/fat-bikes/dolo-semi-wild-mongoose-dolomite-902410.html

Bike snobs still scoffed and enthusiasts on a budget took the (low cost) plunge and for the most part, if you didn’t ask too much of it (Manuel Beastley type riding aside), the Dolomite could provide plenty of fun in the snow, sand or dirt.

Building on the popularity of inexpensive fat bikes, Mongoose announced a new model for 2015 called the Argus. The Argus utilizes an alloy frame that is much lighter and more durable than it’s steel older brothers. The Argus can be called a legit mountain bike, sporting a 2×10 drivetrain, disc brakes, 100mm rims, 4″ Vee Mission tires. The Argus also provides a more upgrade-worthy base to build on, especially with the 0 stack headset that allows you to put in an aftermarket headset adapter so you can upgrade it to a tapered fork.

In this video, Matt Prest from Mongoose shows us the highlights of the 2015 Argus fat bike.
YouTube Preview Image

Another improvement over the Beast and Dolomite, is that the Argus will be offered in 3 sizes (SM, MD, LG). Only one color will be initially offered, the Teal Blue shown here. And what about the weight? The Argus weighs in at just under 35 lbs…not bad for a fat bike. Of course, their is a significant cost increase that comes along with so many upgrades. But there is no arguing that at $999.99, the Argus is still a great bargain and should be available Fall of this year. Bike snobs, you can stop scoffing now.

Mongoose Argus Rear End Mongoose Argus Rear Tire Clearance Mongoose Argus  Front Tire, Fork, Rim

Argus Spec Sheet

Mongoose Argus Specs

Be sure to click through the gallery below to see all the photos.

First Look: 2015 Mongoose Argus – alloy framed fat bike Gallery
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Mongoose Argus fat bike

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Mongoose Argus - close up

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Mongoose Argus Rear End

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Mongoose Argus Rear Tire Clearance

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Mongoose Argus - toptube headtube

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Mongoose Argus - fork tire clearance

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Mongoose Argus - front end

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Mongoose Argus - front tire, fork, rim

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Mongoose Argus - head tube

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Mongoose Argus - drivetrain

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Mongoose Argus crank-pedal

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Mongoose Argus fat bike

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mongoose-argus-geometry

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Mongoose Argus Specs

About the author: Gregg Kato

Gregg Kato studied journalism and broadcasting in college while working many different jobs including deejaying, driving a forklift and building web sites (not all at the same time). Kato has been the Site Manager of Mtbr.com for over 14 years and enjoys riding local Santa Cruz trails. Besides being an avid mountain biker, he is also a motorcycle fanatic. Two wheels, one Passion.


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  • Gary says:

    Not bad, I have always thought most Fat bikes are over priced for Rigid HardTails.

  • Brian says:

    Will this still be a “Wallyworld” bike or will it be available through a LBS?

  • singletrackmack says:

    Aluminum fork?!?! No thanks. That mixed with an aluminum hardtail frame makes for one harsh ride even with fat tires. Steel is the way to go on a rigid fork for sure, and steel makes for much nicer a ride for a hardtail as well. Wonder if they will come out with a sub-1K light steel alloy frame and fork. I would be interested in that.

    • Singletruckbuck says:

      Get real Mack! No way you can sense the subtly of alum v. Steel w/ 4″ tires in the mix.

      • Singletrackmack says:

        From Graham Cycles “Steel provides what many consider the best ride quality; it is the measuring post that other frame materials are judged against. It has a lively feel that aluminum lacks, and carbon fiber tries to emulate. Steel’s ductility (flexibility) helps smooth out the bumps of the trail or the vibration of the road”
        http://www.grahamcycles.com/why-steel/

        • Fasterjason says:

          I don’t know this guy Graham, but you should fact check first before quoting (at least you gave a source).

          A material’s ductility is not a measure of “flexibility” (an elastic deformation), rather it (ductility) is a measure of plastic deformation, into a wire-like form I believe. The term I think you are looking for is Young’s modulus.

          Big difference between elastic and plastic deformation.

  • brizzy says:

    Dude there is no way you’re gonna tell the difference in ride quality between steel and Al when you’re running 8psi in your 4″ tires. Compare the deflection of the tire to the possible deflection of the frame/fork, it’s not even close.

    • Singletrackmack says:

      From Graham Cycles: “Aluminum – A great material for making bikes that are extremely stiff and light. Aluminum offers a cost conscious option for riders seeking light frames. Where aluminum suffers is in the area of ride quality, most people describe it as a harsh, unforgiving ride. This can be masked with carbon components, and suspension, but the frame is still the heart of the bike”
      http://www.grahamcycles.com/why-steel/

  • yo says:

    Blah blah blah. Die commenters die

  • duder says:

    Its obvious singletrackmack has never ridden a bike before.

  • ZombyWoof says:

    I recently saw one at the local Walmart.

  • Johnnie Dorman says:

    I somehow knew that the Mongoose Beast and the Mongoose Dolomite would be the beginnings of something big for Mongoose bikes. I own both the Beast and the Dolomite. First off, the Dolomite was geared way too high and everyone complained about it. Mongoose caught wind of all this and it looks like they got busy and changed up a few things, the crank assembly, for one. Right now I’m waiting for a machinist that I hired to make me a nine inch BMX crank spindle, because I wanted to convert my Dolomite’s crank system to a BMX crank system. With the way that they made the Dolomite’s crank system, it made it very difficult to change the front sprocket to a smaller size sprocket. The crank arm and the sprocket is a one piece setup. Like most things, it’s really hard to get things right the first time. The fat tire bikes are not necessarily about going fast as they are about climbing over things and traveling over tough terrain. I’m using a Shimano Mega-Range cluster in the back and I’m starting out with a 23 tooth sprocket in the front. One of the main reasons I wanted a smaller sprocket in front is because it creates more ground clearance from the bottom of the sprocket to the ground, making it easier to crawl over big rocks, logs, etc. I wanted to just have a nine inch long BMX crank spindle made for my Dolomite, but I thought I would just try cutting the longest BMX spindle I could find in half and welding a piece in-between to make it long enough. That may not work, but if it doesn’t, I will either try to get a machinist to make the crank spindle I need or I will just give up on it, sell the Dolomite, and get me the new Mongoose Argus-allo.

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