20" Mongoose Massif Boys' All-Terrain Fat Tire Mountain Bike, Black/Yellow

50 reviews ratings
By: Mongoose
Walmart #: 551828635
20" Mongoose Massif Boys' All-Terrain Fat Tire Mountain Bike, Black/Yellow
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  • 7 speeds with Shimano rear derailleur
  • Dual disc brakes
  • Aluminum/steel frame
  • Gifting note: This item ships in the manufacturer's original packaging. If intended as a gift, the packaging may reveal the contents.

    About this item

    The Mongoose Massif 20-Inch Boys' Bike has huge four-inch wide tires that let this fun bike roll over all sorts of obstacles. Twist design shifters allow the rider to change gears quickly and easily through seven speeds assisted by a Shimano rear derailleur. The black/yellow boys' bike features disc brakes that can bring the massive tires to a stop quickly and effectively in most any riding conditions. The aluminum steel frame is both strong and durable and allows young boys to explore their surroundings on a true all-terrain bicycle. The bright yellow alloy rims are lightweight and will ensure that the bike and rider can be seen at all times. The Mongoose Massif 20-Inch Boys' Bike also features yellow handle grips and the familiar Mongoose logo in yellow on the front.

    Please note: If you select Site to Store delivery, your bike(s) will not be assembled upon pickup.

    20" Mongoose Massif Boys' Fat Tire Mountain Bike, Black/Yellow:

    • Frame: Aluminum/steel
    • Mongoose boys' bike gearing: 7 speeds with Shimano rear derailleur for all types of riding
    • Brakes: dual disc brakes provide all-condition braking
    • Tires: super-sized 20" x 4" tires
    • Rims: alloy 4" wide rims for lightweight durability
    • Twist shifters change gears easily
    • 3-piece crank provides added durability
    • Some assembly required
    • Dimensions: 56"L x 27"W x 38"H


    Speeds: 7-Speed
    Bike Type: Boys Bike
    Age Start: 8 Years
    Age End: 12 Years
    Battery Type: Does Not Contain a Battery
    Primary Color: Black
    Multi Pack Indicator: No
    Model No.: R1746WM
    Shipping Weight (in pounds): 24.0
    Product in Inches (L x W x H): 56.0 x 27.0 x 38.0
    Assembled in Country of Origin: Imported
    Origin of Components: Imported
    Walmart No.: 551828635

    Customer reviews

    Customer Reviews | 50 reviews | 3.9 out of 5

    4.0 stars

    50 reviews | 3.9 out of 5

    5 stars
    4 stars
    3 stars
    2 stars
    1 stars
    Would recommend to a friend



    Brakes the scale in the "Cool" category

    Customer review by edzspace

    5.0 stars by edzspace

    This was the center piece at my 10 year old's birthday party. You would have thought that a UFO had just landed in the living room when we revealed it in front of the boys and girls. A stout little bike that glistening with tough attitude. The Caterpillar Yellow rims and accents give it that industrial grade construction site ready feel and the tires look like they were just jacked off a Harley Fat Tail. Everything about this bike says "move over, Boss man is coming through!" Pros: Front and rear disk brakes are awesome once you get them lined up and adjusted (a little tricky for someone who hasn't done it before). Strong construction and heavy duty wheels great for Husky sized young boys. Very smooth and easy to shift gear set. This may be a con for older riders, the twist shiftier has a over sized grip that is great for the little pudgy fingers of the younger kids but hard not to accidentally shift gears (a lot) for larger hands. Cons: Everything about this bike is custom built around the wheel size. The frame, forks and the wheel hubs are non standard in size and may have parts availability issues in the future. Replacement tires are an immediate concern as a fat slick tire and disk brake equal lots of show off power slide to a stop activity in a ten year old. My son wanted a BMX bike, something tough not delicate that he can play rough with. I wanted him to have a geared mountain bike so he could keep up with the rest of the family when we ride. This seems like a good compromise.

    Was this review helpful? (31) (9)
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    Tucson AZ
    Would recommend to a friend? Yes
    Age:45 - 54
    Ownership:2 - 7 weeks
    Usage:Every day
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    Fun bike !!

    Customer review by YoungVeli

    5.0 stars by YoungVeli

    Brakes are a little hard to get setup ( nice disk brakes ) , but it's a smooth ride, and great on beach / street terrain. I'm 38 and keep stealing it from my 9 year old / overall 10/10 for price, uniqueness, and functionality.

    Was this review helpful? (23) (3)
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    Would recommend to a friend? Yes
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    Needs some adjustments, but good for the cost.

    Customer review by Peatbog

    4.0 stars by Peatbog

    I had the bike shipped to my local Walmart where I picked it up. The box was damaged but nothing inside was harmed in any way. Putting it together was easy: I had to put the handlebar assembly into the fork tube. All the cables were on the handlebars and the handlebar was in the stem. You need the proper size hex wrench (allen wrench) to tighten things once installed. I had to rotate the brake levers and shifter around a bit for proper fit. This requires a hex wrench of the proper size. The pedals need to be threaded onto the crank arms. You need the proper size open end wrench or an adjustable wrench to do this. The pedals are clearly labeled as to which goes on the right or left (because of left and right handed threads). The seat and seat post assembly needs slide into the frame, but because the seat post clamp is a quick release, you need no tools to do this. However, the seat pivot nut needs tightened very securely or it will not hold the seat at the angle you set it. Also, a seat frame rod that slides into the back of the plastic seat pan would come out if I picked the bike up by the seat, so I quit picking the bike up by the seat. The front wheel needs put on. The proper sized wrench or an adjustable wrench is required to tighten the axle nuts. At this point the bike was ride-able. However, a couple things needed adjusting. The front brake pads rubbed and made a noise, so I had to adjust the caliper which is easy to do. For more information, check this website on how I set up my bike: http://undergroundvelo.proboards.com/thread/3758/peatbogs-walmart-mongoose-adventurers-wonderland You may copy and paste that into your browser if you choose to. I give more information on things than I have space for here. Continuing on, the headset bearings and the bottom bracket bearings were too tight, so I adjusted them. The bike was functional without doing this, but it is better now. It pedals easier and the steering is smoother. Also, I had to adjust the derailleur cable so the the bike would shift through all the gears. This is not unusual with any bike that has to be assembled when you get it. I also needed to use the adjusting screws on the derailleur to keep the chain from falling off the small sprocket as the derailleur moved to far over. These adjustments are relatively easy if you are familiar with them. But if you are not, you may become pretty frustrated trying to get the shifting corrected. If you have problems, find a friendly bike shop (but you will probably have to pay them as they can't stay open working for free) or find a website like the one I listed above where you can ask questions and get the help you need. The seat post is not very long, so if whoever is riding the bike is over about 4'6" or so, you may need a longer seat post. The height I gave there is just a guess. It depends on how you like to have your seat adjusted. However, typical BMX seats are adjusted low, so if you set this up like a BMX bike, it will be fine. This is a cool bike and I am glad I bought it. If you do not know how to adjust the problems I pointed out, you may get aggravated with the bike. But all the parts seems of decent quality and I am very satisfied with the bike for the price I paid. The brakes work well and the gears shifted well once I adjusted things properly. The paint looks good and the bike looks good. The welds on the frame are decent. The decals look to be easily removable if you don't like them. The frame and fork are steel. The Walmart advertising is incorrect in suggesting otherwise. The rims appear to be aluminum, however. Also, there are no training wheels with the bike as suggested in the Walmart advertising. I wish they would have used black hand grips because the orangish-yellow ones will get dirty looking at some point. They do look good now though. Overall, this is a good bike for the money spent. There is nothing else like in a 20" size. If not for the adjustments I needed to make, I would have given the bike a 5-star rating. This bike gets peoples' attention. I hope Walmart makes it in "girl" colors in the future. I like brightly colored bikes for kids as it makes them more visible to those around them. The brightly colored wheels on the present bike are good for that. Presently, I am adding a banana seat and bar, and "apehanger" handlebars to my daughter's Massif. So this is a cool bike for customization also!

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    Massillon, Ohio
    Would recommend to a friend? Yes
    Age:45 - 54
    Ownership:2 - 7 weeks
    Usage:Every few days
    1-3 of 50 total reviews See all

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    by Molly 3/30/2014
    • There are two pads on disc brake calipers. One is 'static' and the other is the compression side, that the cable is attached to. 1 Adjust the static side until it makes contact with the disc. (turn it in.) 2. Loosen the disc caliper mounting bolts. 3. Pull the brake lever (or have someone do it.) Make adjustments to the cable until it takes as little as possible to pull the brake. 4. While you're still pulling the brake, tighten the caliper mounting bolts. 5. turn the static side out 1/8 of a turn so the wheel spins freely. When you pull the brake lever, look closely at the disc itself: It should not 'deflect.' The static side should be as close as possible to the disc without making contact. 6. Tighten or loosen the cable as necessary for the compression side.
      by z1ny7/31/2014
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    • There are three brake adjustments that can be made on the Massif's brakes. One adjustment moves the rear brake pad in and out (the pad that is nearer the wheel; this pad does not move when you pull the brake lever). Another moves the front brake pad in and out (this is the pad that moves when you pull the brake lever). Also, there is an adjustment that moves the entire brake caliper toward and away from the wheel. All of these can be adjusted with just a 5mm Allen wrench (hex wrench). To adjust the brake pads so they do not drag when you spin the wheel, you first must sight along the disk rotor and look down at the caliper to see which brake pad is dragging as you spin the wheel. This is difficult to know what is going on without pictures, so if you want pictures, please go here where I describe the process using pictures: http://undergroundvelo.proboards.com/thread/3758/peatbogs-mongoose-massif-adventurers-adjustment?page=2 Go to page 2 of that thread and scroll down until you find the part about adjusting the brake pads. Anyway, back to here: Since it does not move when the brake lever is pulled, the rear brake pad needs to be adjusted as close as possible to the brake rotor (the disk) without dragging. There is an adjustment on the back of the brake caliper that allows you to use a 5mm Allen wrench to move the rear brake pad toward and away from the rotor. Spin the wheel and adjust the brake pad so it is as close to the rotor as you can get it without it dragging when you spin the wheel. The rotor is probably not perfectly flat so you need to move it away far enough it does not hit the disk at any point while you spin the wheel. If the front pad is dragging, you need to move it away from the rotor just like the rear pad. However, to do this, you probably have to loosen the clamp that holds the cable to the brake caliper arm in order to allow the brake arm to move down a bit which allows the brake pad to move away from the rotor. Use a 5mm hex wrench to do this. There are brake cable tension adjusters on both the brake lever (on the handlebar) and one on the caliper, but those are typically set from the factory so you can only tighten the cable pull, not loosen it, so if the front pad is dragging, loosen the cable clamp and allow the brake pad to move out far enough that it does not rub on the brake rotor. Then spin the wheel and use the brake cable tension adjusters to move the pad in until it just misses dragging on the rotor. There is also a possibility that the entire brake caliper is moved too far in or out and there is not enough adjustment to move one or the other of the brake pads to not rub on the rotor. You can adjust this using two screws. Look at the caliper until you find those two screws (again using a 5mm Allen wrench), loosen them, and move the caliper toward or away from the wheel until you have the clearance you need. Make sure you keep the brake caliper parallel with the rotor when you do this (by sighting along the rotor). Tighten the screws back up. Then adjust the brake pads as described above. Again, it is easier to understand with pictures, so you can go to the bicycle website I have given above to see pictures I have posted there (I can't post pictures here as Walmart does not have that option).
      by Peatbog4/1/2014
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