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Mongoose Juneau Men and Womens Fat Tire Mountain Bike, 26x4-Inch Big Fat Wheels, 16-Speed Trigger Shifters, Adult Aluminum Mountain Frame, Blue

4.4 4.4 out of 5 stars 245 ratings
Size Chart
US Fat Tire Mountain Bike
Brand SizeRider Height (in)Wheel Size (in)
One Size64 - 7426
Bike Type Mountain Bike
Age Range (Description) Adult
Brand Mongoose
Number of Speeds 16
Color Blue
Wheel Size 26 Inches
Frame Material Aluminum
Suspension Type Rigid
Special Feature fat tire, Aluminum Frame, mountain bike
Included Components Mongoose Bike

About this item

  • Fat tire bicycle is designed for versatile riding on all terrains, including sand and snow, its 26-inch wheels fit to riders 5'4 to 6'2 inches tall
  • With hydro-formed tubing, the aluminum mountain-style frame ensures a durable, responsive ride
  • 16-speed trigger shifters with a drivetrain offer swift and accurate gear changes for optimal performance
  • Ensure crisp stopping and precise speed control with the front and rear disc brakes, adding an extra layer of safety to your rides
  • 26x4 inch fat all-terrain tires mounted on 3 inch wide drilled alloy rims provide extra stability across all conditions
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Top Brand: Mongoose

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From the manufacturer

Mongoose
Mongoose

GARAGE TO GLOBAL

Every good story starts with an idea. In 1974, Skip Hess had an idea for a cast-magnesium wheel durable enough for BMX riding. Over 45 years later, Mongoose is a globally recognized brand built on innovation. From BMX, to mountain bikes, scooters, and more, Mongoose delivers one of the best riding experiences out there. And it all started with a wheel in a Southern California garage.

Product Description

"Get the ultimate biking experience with the Juneau fat tire mountain bike by Mongoose. The Juneau features an aluminum mountain-style frame with hydro-formed tubing that provides a durable, responsive ride. 16 speed trigger shifters offer fast, precise gear changes, while the front and rear disc brakes deliver the all-condition stopping power you need. But the star of the show, of course, are those tires. 26x4 inch fat all-terrain tires on 3 inch wide drilled alloy rims provide extra stability in all conditions – including sand and snow. Don’t let anything stand in your way with the Mongoose Juneau. "

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Mongoose

Mongoose Juneau Men and Womens Fat Tire Mountain Bike, 26x4-Inch Big Fat Wheels, 16-Speed Trigger Shifters, Adult Aluminum Mountain Frame, Blue

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Customer reviews

4.4 out of 5 stars
4.4 out of 5
245 global ratings

Customers say

Customers like the smoothness, weight and appearance of the bicycle. For example, they mention it's easy to ride, has smooth shifting and pedaling, and is significantly lighter than steel. Some appreciate the value. Opinions are mixed on ease of assembly, fit, comfort, and sturdiness.

AI-generated from the text of customer reviews

28 customers mention24 positive4 negative

Customers like the appearance of the bicycle. They mention it's a great frame, and a good looking bike. Some say it makes a nice Ebike.

"...This is a good bike. It's quite light for a fat bike that cost me less than $500. The components are not great...." Read more

"...The Farley is a nice bike to ride, but much more expensive, and honestly, no appreciable difference to me for my simple purposes anyway...." Read more

"...The color of this bike is absolutely vivid and beautiful. I have done some quick mods with stuff I already had on hand...." Read more

"...ride, precise shifting, plenty of low gears for snow or whatever, nice paint, good looking bike, feels very sturdy (+ very fast shipping)...." Read more

18 customers mention16 positive2 negative

Customers like the value of the bicycle. They say it's good value for money and the best fat bike for the price.

"...Great bike for that price. Acceptable bike for a few hundred more. But at less than 500, this is a lot of bike...." Read more

"...Despite these issues, this bike seems pretty solid and a good value" Read more

"Excellent bike. Excellent price. Same bike goes for $1,900 in store." Read more

"...Great value for the money for a mid range priced fat bike." Read more

15 customers mention15 positive0 negative

Customers like the smoothness of the bicycle. They mention it's easy to ride, smooth on the trails, and great on the beach. The disc brakes are smooth and quick action, and the bike is grippy.

"...But at less than 500, this is a lot of bike.The bike rides pretty well and I'm happy I bought it and would buy it again for that..." Read more

"...It rolls over leaves, tree branches, and through mud relatively smoothly and with stability...." Read more

"...Its riding great and I'm Very happy with the purchase...." Read more

"...Pluses: Smooth ride, precise shifting, plenty of low gears for snow or whatever, nice paint, good looking bike, feels very sturdy..." Read more

15 customers mention15 positive0 negative

Customers like the weight of the bicycle. They say it's quite light, significantly lighter than steel, and easy to transport. Some customers also mention that the frame is nice and light.

"...This is a good bike. It's quite light for a fat bike that cost me less than $500. The components are not great...." Read more

"...The whole thing is shockingly light - given the perception you get from the big tires you expect it to way a ton, but I can easily one arm it over..." Read more

"...Speaking of the frame, this bike is 6061 aluminum and very light, I couldn’t imagine a steel frame on this bike, it would weight a ton...." Read more

"...Light weight and the gearing makes it great for an older man like myself to peddle slow for climbing hills and maneuverability" Read more

22 customers mention8 positive14 negative

Customers are mixed about the sturdiness of the bicycle. Some mention that it appears to be well built and sturdy, while others say that the brakes are weak and the bike suffered a catastrophic failure.

"...with this either, because those brakes feel like they could burn out and leave you helpless...." Read more

"...low gears for snow or whatever, nice paint, good looking bike, feels very sturdy (+ very fast shipping)...." Read more

"...Of course mechanical disk brakes are weaker than hydraulic, I would not be confident on a steep grade..." Read more

"...All other areas the bike is great, it is comfortable, feels sturdy, looks good, brakes work perfectly." Read more

19 customers mention13 positive6 negative

Customers are mixed about the ease of assembly of the bicycle. Some mention it's very easy to assemble, with good instructions. However, others say that it was a bit tricky, with no help installing the front wheel. They also mention that the instructions are terrible and difficult to add simple accessories.

"...Wheels were true. Good instructions. You just attach handlebars, pedals and seat and you ready to go right out the box...." Read more

"...The assembly is easy enough if you have some familiarity with bikes, though it's exasperating that they can't be bothered to match the instructions..." Read more

"Assembly was a bit tricky but since I have been working on bikes for 50 years it was not too bad...." Read more

"...is light, wide handle bars, great color (my opinion), easy to set up with basic tools, came faster then estimated, great platform to upgrade over..." Read more

17 customers mention6 positive11 negative

Customers are mixed about the comfort of the bicycle. Some mention it's well-balanced and comfortable, while others say the seat is not comfortable for any duration, and the bike feels heavy and laborious to ride.

"...The seat is not comfortable. That will need to be upgraded. Luckily I have some lying around...." Read more

"...A lot of people complain about the seat but I find it comfortable...." Read more

"...immediately was the saddle - as others have said, I did not find the stock saddle comfortable...." Read more

"...I already ordered a new seat though cause this one is horribly uncomfortable for me. Everything was well greased up except the seat post...." Read more

13 customers mention9 positive4 negative

Customers are mixed about the fit of the bicycle. Some mention that it's a great bike for anyone average size, the fat tires come in handy, and the brakes and gears were well adjusted right out of the box. However, others say that it was too small for them, not one size fits all, and not ideal for big and tall people. The seat it comes with is very narrow and hard.

"...The fit is perfect for me at just under 6'...." Read more

"...Everything was well greased up except the seat post. Brakes and gears were well adjusted right out the box and shifters work great...." Read more

"...Bike is not a sized bike like other bikes in it's price range. Stem is way to long for a shorter guys like me (5'7)...." Read more

"...My back brake needed a quick alignment my rear derailer was adjusted well just needed the cable tensioned up a bit to hit the gears smoothly...." Read more

WORTHLESS WARRANTY!
1 Star
WORTHLESS WARRANTY!
I like the bike but Mongoose customer service and warranty are the worst. I had a problem with the freehub (part that makes the clicking sound you hear in the rear wheel) the freehub started making a loud noise and slipped every once in a while so I called Mongoose to get a replacement part/new freehub as the bike was only two months old at the time and under warranty, well long story short... Mongoose doesn't stock the freehub part and they told me they can't get one but they can replace the bike or I could take the bike to one of my local bike shops and have it repaired and they will reimburse me the cost to fix the bike minus any labor, what a joke.I called all my local bike shops within reasonable driving distance, and they all told me they don't carry this type of freehub because it is an outdated old style freehub from the 80's and a cheap China part, they all said modern bikes that they sell don't use this type of freehub and it would be next to impossible to find the part. That said... I did some research and went on amazon and eBay but couldn't find this type of freehub anywhere, there was one freehub that looked similar to mine but you had to order from China and it may not be the right one anyway, so there is no way for me or the bike shops to get one, how could we get one if the manufacturer/Mongoose can't get one?Well this leaves me with the option of returning my bike for a new one which I shouldn't have to do, I told mongoose if you are willing to replace the whole bike then why don't you just take the back wheel assembly off the bike you are willing to send me, send it to me and I will send you back my broken back wheel, PROBLEM SOLVED, no they can't do that, WHAT A JOKE.I told Mongoose I shouldn't have to send my bike back to you because you don't stock parts for your bikes under warranty, I have installed many upgraded parts on the bike and I shouldn't have to disassemble the whole bike and make it stock again because you guys cannot honor your warranty and send me a $25 part, I would have to take apart the whole bike and remove my upgraded parts which include: new...tires, larger disc brake rotors (front and rear) original rear brake rotor was warped out of the box, hydraulic brake system (front and rear) suspension seat post and new seat, front suspension fork, grips, crank gear (original one came bent out of the box) Cateye odometer, decals on the frame, new pedals and fenders, Like I said I shouldn't have to disassemble my bike and make it stock again because Mongoose doesn't carry/stock parts for their bikes under warranty.I also sent Mongoose pics of the part I needed when I first called them to make sure they get me the right part, they said they had the part in stock so I told them to make sure it's the right part before you ship it out to me, so the lady I spoke with told me she was going to double check and show my pics of the freehub part to one of their tech guys to confirm it is the right part before she ships it out, so I waited on the phone for a few minutes and she came back and said... yep it's the right part you need, well when I received the part I started laughing because she sent me the wrong part, she sent me the cassette gears on the rear wheel, I don't know how anyone can make that mistake with a pic of the part in their hand, this more than proves that they literally know nothing about the bikes they are selling and this is not the first time this has happened, my brother needed parts from Mongoose once and he also sent them pics of the part he needed and they sent him the wrong parts as well, after reading some of the other reviews on here it looks like this is a common problem, Mongoose needs to hire people with better technical knowledge of bikes.Bottom line... I shouldn't have to ship my bike back to Mongoose (and have to remove all my upgraded and personalized parts) because they don't stock parts for their bikes under warranty, all I need is a $25 freehub part to be replaced, (THAT MONGOOSE AND NOBODY CAN GET) if you bought a new car and the battery went dead you don't replace the car they replace the battery. I really don't want to take a chance on getting another broken bike from Mongoose because every bike me, my family and friends bought from Mongoose had something wrong with it as did the many people who bought this bike here as per reviews, I just want to fix the bike I have. SHAME ON MONGOOSE FOR NOT HONORING THEIR WARRANTY AND FOR NOT STOCKING PARTS FOR THEIR CUSTOMERS WHEN THEY NEED THEM TO FIX THEIR BIKES UNDER WARRANTY. First pic is of the back wheel so you can see the part I need replaced in the center of the wheel. (FREEHUB) Second pic is of the bike with the many upgraded parts.
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Top reviews from the United States

Uncle Vanya
5.0 out of 5 stars Great Bike at Their Sale Price
Reviewed in the United States on September 25, 2022
Verified Purchase
I had seen this bike for close to their list price for a while, then I happened to see it at $426, and I bought it. Great bike for that price. Acceptable bike for a few hundred more. But at less than 500, this is a lot of bike.

The bike rides pretty well and I'm happy I bought it and would buy it again for that price.

I looked at the various Mongoose mountain bikes and bought the Juneau because it has a front derailleur, rather than being a 1x. (Pronounced "1 by".) Reviews for the other bikes (Dolomite, Aztec, Malus) indicated that people couldn't climb hills b/c the bikes were geared too low. This is true. The Argus is a 1x, but you can climb with it b/c it has a 42 tooth (or thereabouts) gear in the back. Just compare the photos of the Argus to the other 3 and you'll see they all have a tiny cassette of gears in the back. The Juneau also does not have a big gear in the back, but with the extra small gear in the front due to the 2x setup, you can still climb.

This is a good bike. It's quite light for a fat bike that cost me less than $500. The components are not great. The brakes in particular... they do stop the bike but if I were going to use this thing over time I'd want to replace those with hydraulics. I wouldn't got down anything too steep + long (like a 1 kilometer
consistent steep descent) with this either, because those brakes feel like they could burn out and leave you helpless. But for just riding around on some local trails, without trying to win a race, they're okay. And the bike itself performs well. The gears too and shifters are basic, but work. I didn't need to tune them. They worked out of the box.

I took it on a regular trail that is not frequently ridden by bikes, and overgrown. The bike did well. I went right over a bunch of stuff. The bike performed fine on some basic hills, and roads.

The seat is not comfortable. That will need to be upgraded. Luckily I have some lying around.

The handlebars are... this is always a personal thing, but to me they're too straight. I'd like to get some a little more swept back.

You can mount a single water bottle to the bike, but not more. That's a bit lame.

Overall, for the price, I'm happy with the bike. An aluminum fat bike that is less than 40lbs at less than 500 bucks is nice, even though the brakes and gears are only basic.

The manual that it came with was hidden in the seat box. FYI on that. Since I know bikes, I put it together myself without the manual, which was easy enough. (FYI, if you have ever had to take a bike apart to pack it for an airplane trip in a bike bag, then you can assemble this without a manual no problem. You're just putting the handlebars on, adjusting the stem to true, putting the pedals on and the seat in the seat tube. Really easy.)

(For reference, I ride a lot and have an expensive Canyon Spectral trail MTB and a carbon gravel bike, and then a number of cheaper bikes. I'm not a super expert, but I know what I'm doing. I bought this Juneau mainly because I wanted a fat bike to try riding in the snow in the winter and I've heard from friends that they don't really like fat biking, so I figured I'd buy a cheap one before spending 2k on a "real" one, knowing that if I like it I'll want a spare for a friend to ride anyway.)
21 people found this helpful
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AmazonCustomer
5.0 out of 5 stars best value (when purchased at a good price)
Reviewed in the United States on March 18, 2024
Verified Purchase
I was able to get a pair of these bikes for $410 each in Jan 2024. This is the best purchase, and the best _value_ purchase, I have ever made with regards to bicycles. I got them to extend our bike riding season, and it has completely changed the way I look at winter. Not just for snow, but also mud and sand are all now fair game.
The fit is perfect for me at just under 6'. My wife at 5'4 is a little stretched, we will be looking at a shorter stem or swept handlebars for her.
If you consider that most important factor for a bicycle is the frame - everything else will sooner or later be replaced - then you are already ahead because this is the best, lightest frame Mongoose makes. Likewise the alloy rims will last forever and are significantly lighter than steel. The whole thing is shockingly light - given the perception you get from the big tires you expect it to way a ton, but I can easily one arm it over big logs etc.
Component wise it is exactly what you _should_ expect at this price point. Of course mechanical disk brakes are weaker than hydraulic, I would not be confident on a steep grade (but this is a fat bike! not an enduro racer). The shifting out of the box is skippy. A 2x drive train may seem antiquated but it's not like most people need room for a dropper lever on a fat bike, so why not take the extra range? All of these "drawbacks" are things I can totally live with now, and upgrade when I need to make replacements.
The one thing I replaced immediately was the saddle - as others have said, I did not find the stock saddle comfortable. I put the cheapest Planet Bike ARS "taint saver" saddle on there and blood is flowing where it should now :-)
I am all about supporting my LBS but they will be the first to tell you they don't make big margins on new bikes; their bread and butter is tune ups, repairs and upgrades which I will have a lot of!
Bottom line: just do it. You will not regret it.
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Steve
4.0 out of 5 stars The bike is a blast to ride!
Reviewed in the United States on April 12, 2024
Verified Purchase
A week before purchase of the Juneau, I test rode a Trek Farley. The Farley is a nice bike to ride, but much more expensive, and honestly, no appreciable difference to me for my simple purposes anyway.
My original intent for purchasing a fat tire bike is for Winter riding, even though there isn't much snow in Up State, Hudson Valley region NY anymore, there still is mud, debris, and general mess on the local bike paths.
I just started riding this bike (about 5 days now), and honestly I love it. It is just plain fun to ride. It rolls over leaves, tree branches, and through mud relatively smoothly and with stability.
In summary, I'll admit I am a name brand snob, Trek, Specialized, etc, but I am still very happy with the looks of the Juneau...and glad I saved a great deal of money buying it.
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BA
5.0 out of 5 stars Well packaged and easy to put together, uncomfortable seat.
Reviewed in the United States on May 14, 2021
Verified Purchase
I'm 6"3 and 347 lbs hoping to lose 50 pounds at least this summer. lol we'll see how well this bike holds up but so far so good. Height is pretty good with seat at highest limit. The medium frame is right at my inseam when standing on floor with this medium frame. Might add an extension for seat and handlebars but will see how it holds up first, its not a huge deal. I already ordered a new seat though cause this one is horribly uncomfortable for me. Everything was well greased up except the seat post. Brakes and gears were well adjusted right out the box and shifters work great. Wheels were true. Good instructions. You just attach handlebars, pedals and seat and you ready to go right out the box. I was very impressed.

The only issue I had was the front wheel had some side to side play when i would gain alot of speed or when turning with alot of pressure. I could hear something rubbing or rattling most likely the brakes, so I put the quick release as tight as I could and that did the trick. I took it to a bike shop anyways they said everything looked fine and just put the tires to 20 PSI since i'm doing mostly roads and light trails and to compensate for my weight. Its riding great and I'm Very happy with the purchase.

UPDATE: Turns out the rattle was actually the front deflector was loose on the spokes.
17 people found this helpful
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Top reviews from other countries

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JHH
5.0 out of 5 stars Meets my expectations
Reviewed in Canada on February 3, 2022
Verified Purchase
So fat, that's a keeper.
Took 2 weeks and a half from purchase to delivery.
The bike requires an hour of work in order to be ready to ride. Here is what I had to perform:
- The handlebar must be put in place, and the stem needs tightening, all brakes and shifters are already on the handlebar installed correctly.
- The front wheel has to be installed.
- Front derailleur was simply not adjusted at all. Had to set this.
- Pedals must be installed on crank arms.
- Install seat and post.
- Inflate tires.
- Put on front and rear reflectors
That's it! Good to go!
Rides super easy. Weight is ok for an aluminum frame fatbike.
I'm really happy with the gear ratio. There is plenty of low gears to slowly climb very steep slopes, so I will not need to change cassette and chainrings.
The only I'll keep an eye on, as I tried it today, the tire treads grip on soft snow is less than perfect. It doesn't take much to start loosing traction and slip. We'll see if a more agressive rear tire will be necessary.
Overall, great deal.
Customer image
JHH
5.0 out of 5 stars Meets my expectations
Reviewed in Canada on February 3, 2022
So fat, that's a keeper.
Took 2 weeks and a half from purchase to delivery.
The bike requires an hour of work in order to be ready to ride. Here is what I had to perform:
- The handlebar must be put in place, and the stem needs tightening, all brakes and shifters are already on the handlebar installed correctly.
- The front wheel has to be installed.
- Front derailleur was simply not adjusted at all. Had to set this.
- Pedals must be installed on crank arms.
- Install seat and post.
- Inflate tires.
- Put on front and rear reflectors
That's it! Good to go!
Rides super easy. Weight is ok for an aluminum frame fatbike.
I'm really happy with the gear ratio. There is plenty of low gears to slowly climb very steep slopes, so I will not need to change cassette and chainrings.
The only I'll keep an eye on, as I tried it today, the tire treads grip on soft snow is less than perfect. It doesn't take much to start loosing traction and slip. We'll see if a more agressive rear tire will be necessary.
Overall, great deal.
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Andrew Thompson
5.0 out of 5 stars Great bike for the price
Reviewed in Canada on September 15, 2022
Verified Purchase
Fantastic frame and starter components. If you know what your doing you can build a bike worth twice the money for half the price. But as is comfortable and fun.
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C Lachance
4.0 out of 5 stars Satisfaisant pour le prix
Reviewed in Canada on March 23, 2022
Verified Purchase
Je n'avais jamais osé acheter un vélo sur Internet, surtout que tu ne peu pas essayer et comparer. Cependant je suis trés satisfait de vélo. Exactement ce à quoi je m'attendais. Je cherchais un vélo pas trop dispendieux, je voulais un certain nombre de vitesses et un bon ratio pour les basse vitesse. J'ai eu ce que je cherchais.
Je surveillais le poids, nombre de vitesses, type de commande pour les changements de vitesses et tout y était.
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