Mongoose Mountain Bikes 21 Speed Reviews: Ultimate Guide for 2024

Mountain biking is an exhilarating outdoor activity enjoyed by many people around the world.

With the diverse terrain and challenging trails, it not only provides an excellent workout but also an opportunity to connect with nature. One of the essential components of a successful and enjoyable ride is having the right mountain bike to suit your needs and preferences.

And for those who appreciate the versatility and top-notch performance, the Mongoose mountain bike 21-speed has become a popular choice among riders of all levels.

Mongoose is a well-known brand in the cycling industry, recognized for producing durable and reliable bicycles designed for various types of riders and conditions.

The Mongoose mountain bike 21-speed, in particular, offers a suitable option for individuals looking for a capable bike to tackle a wide range of trails. Equipped with 21-speed gearing, these bikes provide the flexibility and power needed to conquer steep inclines, navigate tricky descents, and maintain control on various terrains.

When looking for the perfect Mongoose mountain bike 21-speed, it is important to pay close attention to specific key features that cater to your individual needs. Consider factors such as frame materials, suspension systems, and wheel size to ensure optimal performance and comfort while riding.

The right combination of these elements will dictate the bike’s durability, weight, and overall feel on the trail.

After considering the broad benefits of mountain biking and the specific advantages of a Mongoose mountain bike 21-speed, we devoted countless hours to researching and testing various models to identify the best options that cater to each rider’s unique requirements.

In the following sections, we will discuss our findings in greater detail to help you make an informed decision and get you ready for your next adventure.

Top Mongoose Mountain Bikes: 21-Speed

In our pursuit to present the best options, we have curated a list of top Mongoose mountain bikes with 21-speed capabilities. Explore our selections and choose the one that suits your needs and preferences.

Mongoose Switchback Adult Mountain Bike

Mongoose Switchback Mountain Bike

We recommend the Mongoose Switchback for a smooth and enjoyable trail-riding experience with reliable gear changes and all-weather-stopping power.


  • Lightweight, durable aluminum frame
  • The 21-speed drivetrain with smooth gear changes
  • All-weather mechanical disc brakes


  • Lacks a kickstand
  • May require professional tuning before use
  • Some users report issues with shipping and missing parts

We recently took the Mongoose Switchback out for a spin and were thoroughly impressed by its performance on various trail terrains. The aluminum frame provided a lightweight yet durable structure that made for an agile and enjoyable ride.

With 27.5-inch wheels, this bike is suitable for riders ranging from 5’3″ to 6’2″ in height, allowing a broad spectrum of cyclists to navigate trails with ease.

One of our favorite features was the smooth gear transitions provided by the 21-speed drivetrain with trigger shifters. When tackling different elevations and terrains, we experienced seamless shifting that kept our focus on the trail instead of worrying about gear changes.

The all-weather mechanical disc brakes added a sense of security on wet or slippery surfaces, knowing that we had reliable stopping power at our fingertips.

However, we did encounter a few drawbacks with the Mongoose Switchback. The bike does not come with a kickstand, which is inconvenient for resting during breaks or when stopping to enjoy the scenery. Moreover, it’s essential to have the bike tuned by a professional before hitting the trails.

Some users have reported shipping-related issues and missing parts—something to keep in mind when ordering online.

With its impressive performance and ability to tackle different trails, we believe the Mongoose Switchback is worth considering for those seeking a reliable and enjoyable 21-speed mountain bike experience.

Just be prepared to purchase a kickstand separately and ensure a professional tune-up is completed before setting out on your adventures.

Mongoose Flatrock Mountain Bike

Mongoose Flatrock Mountain Bike

The Mongoose Flatrock is a reliable mountain bike that suits riders seeking performance and comfort on various terrains.


  • The lightweight aluminum hardtail frame
  • 21-speed gear system for effortless gear changes
  • Durable double-wall alloy rims


  • Front and rear alloy v-brakes may require frequent adjustment
  • Element suspension forks may not be suitable for extreme off-road trails
  • Limited color options (only available in purple)

The Mongoose Flatrock mountain bike impressed us with its lightweight and sturdy build, as the 6061 aluminum hardtail frame makes it easy to navigate across different terrains.

We found the 26-inch wheels to be perfect for riders between 5’4″ and 6’2″ tall. Ideal for all-terrain adventures, this bike ensures a smooth and comfortable ride every time.

We particularly appreciated the 21-speed twist shifters and rear derailleur, which allowed us to effortlessly change gears when tackling inclines or speeding downhill. Moreover, the double-wall alloy rims add to the bike’s overall durability, ensuring a long-lasting mountain biking experience.

However, we noticed that the front and rear alloy v-brakes might require regular adjustments for optimal performance. Additionally, the Element suspension fork, while enhancing control and smoothness on moderate trails, may not be suitable for extreme off-road conditions.

Lastly, the bike is only available in purple, which may not cater to everyone’s aesthetic preferences.

The Mongoose Flatrock mountain bike offers a well-rounded and enjoyable experience for riders who love exploring new trails.

Its lightweight frame, smooth gear changes, and overall durability make it a reliable choice, though it might not be perfectly suited for extreme off-road adventures.

Mongoose Maxim Girls Mountain Bike

Mongoose Maxim Girls Mountain Bike

A decent option for young trail enthusiasts looking for an affordable mountain bike.


  • Lightweight aluminum frame
  • 21-speed drivetrain for various terrains
  • Smooth suspension fork


  • Mediocre welding quality
  • Possible missing parts in the shipment
  • Inaccurate assembly instructions

Last week, we had the opportunity to test out the Mongoose Maxim Girls Mountain Bike and were able to pick out a few significant pros and cons. Overall, the bike boasts a lightweight aluminum frame, making it easier for young riders to maneuver.

The 21-speed drivetrain provides versatility for different terrains, ensuring smooth rides on both hilly and flat surfaces.

The suspension fork effectively absorbs bumps and increases control, which makes a noticeable difference when navigating through trails. However, we couldn’t help but notice that the welding quality joining the frame tubes appeared to be subpar and could potentially impact the bike’s durability in the long run.

On top of that, some users reported missing parts such as axle washers and bolts, which may require extra efforts to reach out to the seller or manufacturer for replacements.

The assembly instructions included with the package were also generic and not specific to this particular model, making the setup process a little more challenging than it should be.

Despite the minor drawbacks, the Mongoose Maxim Girls Mountain Bike remains a reasonable choice for young riders who are enthusiastic about trail biking.

The bike’s other features – such as linear-pull brakes and a 3-piece crank – provide added value, ensuring reliable shifts and braking power. Just be prepared to double-check the parts and have some patience during assembly.

Mongoose Exlipse Full Dual-Suspension Mountain Bike

Mongoose Exlipse

The Mongoose Exlipse mountain bike is a solid choice for kids seeking a comfortable and versatile bike for various terrains.


  • Lightweight and sturdy steel frame
  • 21-speed Shimano drivetrain for various riding conditions
  • Dual suspension for a smooth ride on rough terrain


  • Brake and gear adjustments may require professional assistance
  • Not ideal for taller children within the recommended age range
  • Shifter may become difficult after multiple uses

We recently tried out the Mongoose Exlipse Full Dual-Suspension Mountain Bike and found it to be a reliable and enjoyable ride for young cyclists. The lightweight and strong steel frame ensures that the bike can withstand rugged environments, while the 21-speed Shimano drivetrain allows for smooth transitions between gears and various terrain conditions.

The dual suspension on this bike was a standout feature, providing a comfortable and smooth riding experience regardless of the rough or uneven surfaces we encountered. This made the bike more enjoyable to ride and encouraged us to venture further and explore diverse landscapes.

However, we did experience some challenges with this bike. The brake and gear adjustments seemed to be a bit complex and required professional assistance to ensure optimal performance.

Additionally, some taller children within the recommended age range might have issues with seating position, as it may feel too low. Lastly, we noticed that after several uses, the shifter became difficult to use, with the chain not sliding smoothly during gear changes.

The Mongoose Exlipse Full Dual-Suspension Mountain Bike offers a solid combination of comfort, versatility, and durability for young riders.

While there may be some minor setbacks, it’s a dependable option worth considering for parents looking to invest in a bike that can grow with their child’s skills and adventurous spirit.

Mongoose Impasse Full Suspension Mountain Bike

Mongoose Impasse Full Suspension Mountain Bike

The Mongoose Impasse is a solid choice for beginner to intermediate riders looking for a full-suspension mountain bike with great value.


  • Comfortable and performance-driven 18-inch aluminum suspension frame
  • Smooth and reliable Element suspension fork
  • Easy gear switching with a 21-speed rear derailleur and SRAM twist shifters


  • May require some adjustments out of the box
  • The front suspension could be better
  • Not suitable for more advanced riders

We recently took the Mongoose Impasse Full Suspension Mountain Bike for a spin, and let us tell you, this ride offers a great mix of comfort, performance, and value for the cost.

The 18-inch aluminum suspension frame gives us optimal support on various trails, fitting riders between 5’4″ and 6’2″ tall.

What stands out about this bike is its smoothness – the Element suspension fork does an excellent job of smoothing out bumps and increasing control. The 21-speed rear derailleur equipped with SRAM twist shifters allows for effortless gear switching, making it a breeze to handle different terrains.

However, there are a few drawbacks. We noticed that some adjustments were needed upon unpacking the bike, such as tuning the brakes and gear shifts.

Although the front suspension is decent, it could be improved for a more comfortable ride. Furthermore, advanced riders may find this bike lacking some essential features they seek in a mountain bike.

The Mongoose Impasse Full Suspension Mountain Bike is undoubtedly a good buy for beginner to intermediate riders who want an affordable yet efficient mountain bike.

Its comfort, performance, and value outweigh the few cons, making it a first-rate choice for those starting their mountain biking journey.

Buying Guide

When looking for a Mongoose mountain bike with 21 speeds, there are several factors to consider. In this Buying Guide, we will discuss the essential features to help you choose the best product.

Firstly, consider the frame material. Mountain bikes come in various frame materials, such as aluminum, steel, carbon fiber, and titanium. Each material has its benefits and drawbacks.

Aluminum is lightweight and affordable, while steel offers strength and durability. Carbon fiber is lightweight and strong but tends to be more expensive, while titanium offers a great balance of weight, strength, and durability but can be pricey.

Suspension is another critical factor to consider in a 21-speed Mongoose mountain bike. There are three types of suspensions:

  1. Rigid: with no suspension at all, these bikes offer better pedaling efficiency but less comfort on rough terrain.
  2. Hardtail: featuring a suspension fork in the front only, these bikes are suitable for trails and provide a mix of efficiency and comfort.
  3. Full suspension: offering a suspension fork in the front and a rear shock absorber, these bikes provide maximum comfort and control on rough terrain but can be heavier and less efficient when pedaling.

The wheel size can also affect your mountain biking experience. Common wheel sizes include 26-inch, 27.5-inch, and 29-inch. Smaller wheels (26-inch) accelerate faster and provide more maneuverability, while larger wheels (29-inch) roll over obstacles more easily and provide more stability.

Next, consider the gear range. A 21-speed bike provides a wide gear range, allowing you to tackle hills and flat terrain comfortably. However, make sure the bike has quality derailleurs and shifters for smooth gear changes.

Lastly, pay attention to the braking system. There are two main types of brakes: mechanical disc brakes and hydraulic disc brakes. Mechanical disc brakes tend to be more affordable and easier to maintain, while hydraulic disc brakes provide more stopping power and modulation but can be more expensive.

By considering these features and understanding your specific needs, you can confidently select the best Mongoose mountain bike with 21 speeds for your adventures.

Frequently Asked Questions

How to adjust gears on a 21-speed Mongoose mountain bike?

To adjust the gears on a 21-speed Mongoose mountain bike, follow these steps:

  1. Shift the gears to a middle setting.
  2. Adjust the rear derailleur by loosening or tightening the barrel adjuster.
  3. Fine-tune the front derailleur using a similar method.
  4. Test the bike to ensure smooth shifting. Make any necessary adjustments accordingly.

What are common issues with Mongoose 21-speed mountain bikes?

Some common issues with Mongoose 21-speed mountain bikes include:

  • Difficulty shifting gears
  • Chain slipping or skipping
  • Brake system malfunctions
  • Worn or damaged components Regular maintenance can help prevent these issues and keep your bike in optimal condition.

Which Mongoose 21-speed mountain bike is best for beginners?

For beginners, we recommend the Mongoose Impasse or the Mongoose Status 2.2. Both are entry-level models with 21-speed gearing systems, providing a smooth and comfortable ride for new riders.

Where can I buy replacement parts for a Mongoose 21-speed mountain bike?

Replacement parts for Mongoose 21-speed mountain bikes can be found on their official website, local bike shops, and online retailers like Amazon and eBay.

How to maintain a Mongoose 21-speed mountain bike?

To maintain a Mongoose 21-speed mountain bike, perform the following routine checks and maintenance tasks:

  • Keep the drivetrain clean and lubricated.
  • Inspect and adjust brakes regularly.
  • Check and maintain tire pressure.
  • Inspect and tighten any loose bolts or components.

Are there any upgrades available for Mongoose 21-speed mountain bikes?

Yes, upgrades for Mongoose 21-speed mountain bikes include:

  • Better quality tires for improved traction and control.
  • Suspension upgrades for enhanced shock absorption.
  • Brake system upgrades for more reliable stopping power. Before upgrading, consult your local bike shop for compatibility and expert advice.

John Loyal

I'm a Mountain Bike enthusiast and am passionate about testing new Mountain Bike and electric Bike models and presenting the results of my findings.

More to Explore