Examining the Trek 3900: Is This Bike Worth Buying? | PedalChef

Key Takeaways

  • The Trek 3900 combines durability and versatility, making it suitable for diverse terrains and rider levels.
  • With proper maintenance, the Trek 3900 promises longevity, underlining its value for both beginners and intermediate riders.
  • Despite its entry-level categorization, the bike offers a blend of reliable features and customization options, providing a tailored riding experience.

If you are looking for a new mountain bike, the Trek 3900 is one option worth considering. We’ll take a look and see if this bike is worth the investment.

The Trek 3900 is a versatile mountain bike with Trek's Alpha Aluminum frame, offering lightweight durability. It's suitable for city streets and trails, with features like a suspension fork for comfortable riding and Bontrager-approved rims for enhanced handling.

The following sections will discuss the Trek 3900 regarding ride quality, frame and fork performance, wheels and brakes, and overall value. We will provide you with our opinion based on firsthand experiences and thorough research, including sharing insights from other riders. The information provided was also discovered through personal tests using the bike.



Trek 3900 Bike Overview

The Trek 3900 is a popular mountain bike that has been on the market for quite some time. Its history can be traced back to when Trek Bikes was first established in the mid-1970s.

Over the years, the bike has evolved, with many models being suitable for different riders and terrains. The Trek 3900 has plenty to offer to cruise the city streets comfortably and confidently.

Its frame comprises Trek's Alpha Aluminum, making it both lightweight and robust. Available in various frame sizes, it caters to riders of different heights. The bike is equipped with a suspension fork, which allows for comfortable and efficient riding on multiple terrains.

The Trek 3900 features wheels with sturdy Bontrager-approved rims, providing durable handling on city streets and trails. Meanwhile, its wide range of tires offers excellent grip and traction on various surfaces.

Beyond these core specifications, the Trek 3900 also features disc-compatible dropouts, fenders, and rack mounts. These extras allow for easy customization and the addition of valuable accessories, depending on your preferences and needs.

Trek 3900 Bike Key Features

The Trek 3900 is an exemplary model that combines advanced technology with sleek design. Its distinctive features make it an ideal choice for those seeking performance and style. Here are a few worth mentioning.

Formula Alloy FM31 Wheels

The Trek 3900 features Formula Alloy FM31 wheels, providing a lightweight yet durable option that can handle various terrains. These wheels are well-suited for city streets and light off-road trails, offering the user a smooth and consistent ride.

Moreover, their precise construction ensures better traction and stability, especially during sharp turns and sudden stops, boosting rider confidence. The elegant design also adds an aesthetic appeal to the bike, making it functional and visually captivating.

Alpha White Aluminum Frameset

This mountain bike's Alpha White Aluminum frameset is both lightweight and sturdy. It has disc-compatible dropouts for enhanced braking performance and fender mounts for mud and water protection.

The frame is available in various sizes to cater to many riders. Plus, you will notice the adjustable headset, durable stem, sturdy cassette, and bi-oval downtube all significantly influence how this bike performs on various terrains.

This blend of design and technology ensures longevity and peak performance, even under the toughest conditions. Its sleek finish further amplifies the bike's overall appearance.

SR Suntour XC Suspension Fork

The Trek 3900 has an SR Suntour XC suspension fork, which absorbs bumps and provides a comfortable ride on rough terrain. With this fork, you can enjoy smoother handling and better control when tackling challenging trails.

The design also reduces strain on the rider's body, especially the shoulders and wrists. It's crafted for durability, ensuring it stands the test of time and rough terrains without wearing out easily, making your adventures worry-free.

3X8 Drivetrain

The bike's 3X8 drivetrain offers various gears to suit different riding styles and conditions. The rear derailleur on the Trek 3900 ensures smooth and reliable shifting performance.

This setup is perfect for beginners getting used to various terrains and gauging their preferred cycling modes. This can be tackling steep climbs or riding high speeds on flat surfaces.

The drivetrain requires minimal maintenance, ensuring you spend more time riding and less time tuning. Its intuitive design facilitates swift gear transitions, enhancing the overall cycling experience.

Trek 3900 Performance Analysis

When assessing the caliber of a mountain bike, it's imperative to analyze its performance in real-world conditions. Here is what we learned about the Trek 3900 after various test rides.


The Trek 3900 mountain bike offers a comfortable ride owing to its saddle and handlebar design. The handlebar Bontrager ensures a secure grip and good handling. Its saddle provides a cushioned surface that supports you throughout your journey.

Including specialized grips further accentuates the user experience, providing a layer of security and a tactile feel.


With its 3X8 drivetrain, the Trek 3900 offers a wide range of shifts, making it suitable for various speed requirements. The bike's lightweight frame and wheels contribute to its overall speed capabilities, allowing for swift acceleration and effortless rides.

Whether racing downhill or cruising, it promises a responsive and efficient speed performance. I enjoyed how quickly I could pick up the pace on longer riders without a struggle.


The Trek 3900's frame is built with Alpha White Aluminum, ensuring the bike's solid and sturdy foundation. Most of the components are long-lasting, except for the Suntour forks, which might require replacement after extended use.

The stock tires may show signs of wear sooner than expected, so monitoring them for timely replacement is essential. While the stock tires offer good traction and performance, they may show signs of wear sooner than expected.

Terrain Adaptability

The Trek 3900 mountain bike performs reasonably well on general pavement and city streets. However, its true capabilities shine on off-road trails and uneven terrains, thanks to its front suspension and knobby tires.

This bike offers stability and control for riders who frequently encounter rough paths. This is why the brake design is the way it is, too.

How Long Does The Trek 3900 Last?

The Trek 3900 is a popular mountain bike known for its durability and ability to handle various terrains. This bike can last for several years with proper care and maintenance, providing enjoyable riding experiences.

The bike's frame is constructed from Alpha Silver Aluminum, ensuring a long-lasting and lightweight design. In terms of components, most of them are Bontrager-approved, meaning they are of good quality and reliable.

To extend the life of the Trek 3900, it's essential to keep up with regular maintenance. This includes cleaning and oiling the chain, checking and adjusting the rear derailleur, and inspecting the brakes and wheels for wear and tear.

Be sure to visit your local bike shop for tune-ups and component replacements if needed. For city streets riding or daily commutes, the Trek 3900 comes with disc-compatible dropouts and fender mounts.

While the Trek 3900 may not be the most advanced mountain bike on the market, it is certainly a durable and reliable option for beginners and intermediate riders. In our opinion, with proper care and maintenance, the Trek 3900 is well worth the investment.

Is The Trek 3900 Good For a Beginner?

The Trek 3900 is one of the models in Trek's entry-level mountain bike lineup from years past. For beginners looking to get into mountain biking or casual riding, the Trek 3900 offers several benefits.

First, Trek is known for building sturdy frames. The 3900 model, in particular, features an aluminum frame, which is both lightweight and durable. Being an entry-level bike, the Trek 3900 is typically priced more affordably than more specialized or higher-end mountain bikes.

While the components on the 3900 aren't top-of-the-line, they are more than adequate for beginners and casual riders. They offer a decent mix of reliability and performance for the price.

For a beginner or someone looking for a versatile and affordable bike for casual riding or light trail use, the Trek 3900 is a good option.

Is The Trek 3900 Bike Worth Buying?

The Trek 3900 boasts a sturdy frame that is reportedly quite durable. The frame geometry is designed to handle a variety of trails and city streets, making it suitable for different levels of riders.

Additionally, the bike comes equipped with fender mounts and disc-compatible dropouts, allowing for personalized upgrades and the addition of accessories. One area that stands out in the Trek 3900 is its brakes.

The stock brakes provide good stopping power, though some users report reduced effectiveness at high speeds. Upgrading the brakes might be something to consider, depending on your riding style and preferences.

The bike's gearing and drivetrain, featuring a wide range and rear derailleur, have been praised for their performance on various terrains. However, it's important to keep in mind that some components, such as the forks and pedals, have received mixed reviews, with riders suggesting possible upgrades.