The Assault Bike ProX has emerged as a significant contender in the high-intensity cardio equipment market, offering a full-body, low-impact workout that can be scaled to extreme intensity levels. Popular within the demanding CrossFit community, this fan bike distinguishes itself with a robust belt-driven system and a heavy-duty steel frame, positioning it as a potent tool for enhancing both cardiovascular endurance and muscular strength. Breaking Muscle’s team of experts, comprising athletes, strength and conditioning coaches, and certified personal trainers, put the AssaultBike ProX through rigorous testing to ascertain its capabilities and place within the competitive landscape of fitness machinery.
Key Takeaways
The Assault Bike ProX represents a significant advancement in fan bike technology, blending durability with a user-centric design. Its key strengths lie in its robust construction, smooth belt-driven mechanism, and comprehensive data tracking capabilities. While it comes at a premium price point, its performance and longevity justify the investment for serious athletes and fitness enthusiasts.
Assault Fitness AssaultBike ProX Cons
Despite its numerous advantages, the Assault Bike ProX is not without its limitations. The primary concern for some users might be its substantial cost, placing it in the higher echelon of home gym equipment. Additionally, while the belt-driven system offers a smoother experience, it requires a continuous pedaling effort to maintain momentum, which can be a steeper learning curve for beginners compared to some other air bikes. The included workout programs, while functional, are less sophisticated than those found on highly interactive smart bikes, and the Assault Fitness App’s compatibility issues with the latest Android versions could be a point of frustration for some users. Furthermore, the absence of a standard wind guard, though available for separate purchase, is a minor oversight for those training in colder environments.
Assault Fitness AssaultBike ProX Rating
Breaking Muscle’s proprietary scoring system, developed from extensive testing of hundreds of fitness machines, was applied to evaluate the AssaultBike ProX across various critical categories. This assessment involved not only the bike’s standalone performance but also a comparative analysis against approximately 30 other exercise bikes.

| Factor | Rating (out of 5) |
|---|---|
| Price | 4 |
| Materials, Build, and Construction | 5 |
| Delivery and Assembly | 5 |
| Performance | 4 |
| Included Workouts | 3 |
| Heart Rate Monitor | 4 |
| Display and Stats Tracking | 5 |
| Conveniences | 4 |
| Workout App and Subscriptions | 4 |
| Bluetooth Connectivity | 5 |
| Noise Level | 4 |
| Portability | 4 |
| Warranty | 5 |
Assault Fitness AssaultBike ProX Overview
Hailing from the creators of the AssaultRunner, a highly regarded treadmill, the Assault Bike ProX embodies a commitment to robust engineering. Its foundation is a heavy-duty steel frame, meticulously finished with a black powder coating designed to resist corrosion and ensure enduring performance. This fan bike is engineered to deliver a challenging workout suitable for athletes of all levels.
The integration of a belt-driven system contributes significantly to a quieter and smoother operational experience compared to traditional chain-driven mechanisms. This system also translates to reduced maintenance requirements, a practical advantage for users prioritizing convenience and minimizing upkeep.
Assault Fitness AssaultBike ProX In-Depth Review
Price
Priced at $899 at the time of review, the Assault Bike ProX positions itself as a premium option within the fan bike category. For those seeking financing, options are available through Affirm, with monthly payments around $82. This pricing places it above the AssaultBike Classic ($699) but below the Concept2 BikeErg ($1,100), establishing a competitive mid-to-high range. A significant cost-saving factor is the inclusion of free shipping, which is a considerable benefit given the equipment’s substantial size and weight. This contrasts with other brands where shipping costs can add an additional $100 or more. Considering these factors, the Assault Bike ProX receives a 4 out of 5 stars for its shipping policy, financing accessibility, and overall value proposition.
Materials, Build, and Construction Quality
Weighing 125 pounds, the Assault Bike ProX is engineered to support a maximum user weight of 330 pounds. Its heavy-duty steel frame, enhanced with a corrosion-resistant black powder coating, suggests a product built for longevity and minimal maintenance. This construction is reminiscent of other high-end fitness equipment, such as the Rogue Echo Bike, which also features a durable powder-coated finish. However, the Assault Bike ProX offers a slightly more compact footprint, measuring 51.73 inches in length, 24.52 inches in width, and 52.51 inches in height, making it more adaptable to smaller training spaces compared to the Rogue Echo Bike’s dimensions (55 inches long, 29.5 inches wide, 52.25 inches high).
Comfort and adjustability are key features. The bike includes a wide, padded seat that offers 11 height adjustments and six directions of fore-aft movement, mirroring the adjustability of its predecessor, the Assault Bike Pro. The rubberized handlebars are designed to provide a secure and comfortable grip during intense workouts. A notable addition is the inclusion of footpegs at the base of the handlebars, allowing users to isolate upper body movements for targeted arm workouts or for rehabilitation purposes. Based on its superior build quality and thoughtful design, the Assault Bike ProX earns a perfect 5 out of 5 stars in this category.

Delivery and Assembly
The Assault Bike ProX excels in its delivery and assembly process, achieving a perfect 5 out of 5 stars. The bike arrives approximately 75% assembled, significantly simplifying the setup for the end-user. Essential components such as the LCD console, pedals, handlebars, seat post, and saddle are the primary attachments required. Assault Fitness thoughtfully includes all necessary tools, streamlining the process further. Most users can expect to complete the assembly within 35 to 45 minutes, making it an accessible setup experience even for those with limited mechanical experience.
Performance
During testing, the Assault Bike ProX delivered a noticeably smoother and quieter ride compared to other air bikes, including the Titan Fan Bike and the AssaultBike Classic. This enhanced performance is primarily attributed to its belt-driven system. Unlike chain-driven bikes, this system offers a more refined user experience. The resistance mechanism is dynamic: the steel fan wheel generates resistance proportional to the user’s pedaling effort. The harder and faster you pedal, the greater the air resistance becomes, ensuring a consistently challenging workout.
However, a characteristic of fan bikes, particularly those with belt-driven systems, is that the fan wheel stops moving once pedaling ceases. This requires a more deliberate effort to re-engage the resistance when resuming the workout. For individuals accustomed to inertia-driven stationary bikes, this can present an initial challenge, demanding a more committed approach to high-intensity interval training (HIIT). Consequently, the Assault Bike ProX receives a 4 out of 5-star rating for performance, acknowledging its excellent mechanics while noting the learning curve associated with its resistance system.
Included Workouts
The Assault Bike ProX features an LCD monitor equipped with seven built-in training programs and a competition mode, catering to a range of fitness goals. Additionally, the accompanying Assault Fitness App provides access to instructor-led programs and allows for the creation of customized workouts. While these features offer a solid foundation, the breadth and interactivity of the pre-programmed workouts do not quite match those found on more advanced smart bikes, such as the Peloton. Nevertheless, for users who appreciate guided routines or need a starting point for their training, the included programs are a valuable asset. The bike scores a 3 out of 5 stars in this category, reflecting its functional but not groundbreaking workout offerings.
Heart Rate Monitoring
The Assault Bike ProX demonstrates improved compatibility for heart rate monitoring compared to its predecessor. While the AssaultBike Classic was limited to specific Polar chest straps, the ProX is compatible with a broader range of heart rate monitors, including those from Garmin, via its Bluetooth connectivity. Users will need to purchase a compatible heart rate monitor separately. This requirement, common across many exercise bikes, leads to a rating of 4 out of 5 stars for heart rate monitoring.

Display and Stat Tracking
The Assault Bike ProX boasts a five-by-eight-inch high-quality LCD monitor that provides comprehensive workout data. Powered by four included AA batteries, the console effectively tracks key metrics such as calories burned, distance covered, heart rate, speed, watts (power output), and RPM (revolutions per minute). Crucially, it integrates with the Assault Fitness App for enhanced functionality. The inclusion of watts and RPM tracking is a significant advantage over some competitors, like the Rogue Echo Bike, which does not display these metrics on its console. This detailed feedback allows users to precisely quantify their exertion and progress, contributing to a 5 out of 5-star rating for display and stat tracking capabilities.
Conveniences
The Assault Bike ProX incorporates several thoughtful conveniences that enhance the user experience. Notably, it operates without the need for an electrical outlet, offering unparalleled flexibility in placement, both indoors and outdoors. This is a particularly attractive feature for commercial gym owners, as it eliminates trip hazards associated with power cords. The bike also includes integrated holders for a device and a water bottle, ensuring essential items are within easy reach. While some fan bikes, like the Titan Fan Bike, offer similar amenities, others, like the Rogue Echo Bike, require separate purchases. The inclusion of these standard features is a testament to Assault Fitness’s focus on user practicality. The only minor drawback identified is the absence of a standard wind guard, which, while available for an additional $39, would have been a welcome addition. Despite this, the overall convenience factor earns the bike a 4 out of 5 stars.
Workout Apps and Subscription Options
The Assault Bike ProX integrates seamlessly with the Assault Fitness app, a feature that garnered positive feedback from product testers. This app, available for free download on the App Store and Google Play, offers a diverse library of instructor-led workouts. Users can engage in these programs individually or participate in virtual competitions with other athletes. Many workouts are designed to incorporate other fitness equipment, such as dumbbells and kettlebells, promoting well-rounded training. However, as of the writing of this review, the app was not available on the most recent version of Android, which could be a limitation for some users. This, along with potential future development needs, leads to a rating of 4 out of 5 stars for the workout app and subscription options.
Bluetooth Connectivity
The Assault Bike ProX is equipped with Bluetooth connectivity, a feature that, while increasingly common, remains a valuable asset. Many budget-friendly cardio machines omit this functionality, and even Assault Fitness’s own classic model lacks Bluetooth. This capability allows for seamless integration with heart rate monitors and fitness apps, enhancing the data collection and training experience. For its reliable Bluetooth implementation, the ProX receives a strong 5 out of 5 stars.
Noise Level
The belt-driven system of the Assault Bike ProX significantly contributes to its quieter operation compared to chain-driven fan bikes like the Schwinn Airdyne. This reduced noise output is a crucial consideration for home gym users, especially those training during early morning or late-night hours when noise can be disruptive. While no fan bike can be entirely silent due to the nature of air displacement through the flywheel, the Assault Bike ProX offers a remarkably subdued operational sound profile, earning it a 4 out of 5 stars for noise level.

Portability
The Assault Bike ProX includes two transport wheels at its front, offering a degree of portability. By tilting the machine, users can maneuver it across most floor surfaces. However, its substantial weight of 125 pounds means that relocation may still present a challenge for some individuals. This balance between integrated transport features and inherent weight leads to a portability rating of 4 out of 5 stars.
Warranty
Assault Fitness provides a robust warranty package for the Assault Bike ProX, contributing to its overall value and user confidence. The bike is covered by a three-year warranty on non-wear parts and an extensive seven-year warranty on the frame. While the non-wear parts warranty does not cover components subject to normal wear and tear, such as the seat, pedals, and handle grips, this is standard practice across the industry. The extended warranty periods, particularly the seven-year frame coverage, surpass those offered by competitors like Rogue (two years on the Echo Bike) and Titan (one year on their fan bike). This comprehensive warranty coverage earns the Assault Bike ProX a perfect 5 out of 5 stars.
Assault Fitness AssaultBike ProX Specs
Overall Dimensions
The Assault Bike ProX measures 51.73 inches in length, 24.52 inches in width, and 52.51 inches in height. These dimensions are slightly larger than the AssaultBike Classic, necessitating careful space planning for potential buyers.
Resistance
As a fan bike, the Assault Bike ProX utilizes air resistance generated by a fan wheel. The intensity of the workout is directly proportional to the user’s pedaling speed and force. The belt-driven system ensures that resistance is applied dynamically and smoothly. A key characteristic of this system is that the fan wheel only spins when the user is actively pedaling or moving the handlebars. This means that momentum is not maintained when you stop, requiring a more consistent effort to keep the resistance engaged.
Weight Capacity
The Assault Bike ProX is rated to accommodate users weighing up to 330 pounds. This is an increase from the AssaultBike Classic’s 300-pound limit and falls slightly below the Elite model’s 350-pound capacity.

Seat and Handlebar Adjustments
The Assault Bike ProX offers considerable adjustability to suit a wide range of users. The seat can be set to 11 different height positions and adjusted in six directions horizontally (fore and aft). These adjustments are comparable to many other fan bikes on the market, though some competitors, like the Rogue Echo Bike, may offer fewer fore-aft seat adjustments.
Electrical Requirements
A significant advantage of the Assault Bike ProX is its lack of reliance on an electrical outlet. This allows for complete freedom in placement, making it suitable for any training environment, whether indoors or outdoors. The console itself requires four AA batteries for operation.
Assault Fitness AssaultBike ProX vs. Echo Bike
The Assault Bike ProX and the Rogue Echo Bike share several fundamental similarities, including their belt-driven mechanics, which provide a smooth and quiet workout experience, and their self-powered operation, eliminating the need for an electrical connection. Both machines are also equipped with transport wheels, enhancing their maneuverability despite their substantial weight.
However, key differences exist. The Rogue Echo Bike is notably bulkier in its dimensions, measuring 55 inches in length and 29.5 inches in width, compared to the Assault Bike ProX’s 51.73 inches by 24.52 inches. Despite its larger frame, both bikes share the same 330-pound weight capacity. A significant distinguishing factor lies in the console’s data display. The Assault Bike ProX provides more detailed metrics, including watts and RPM, which are crucial for performance tracking and analysis, an advantage over the Rogue Echo Bike’s less comprehensive display. This difference in data feedback could be a decisive factor for athletes who prioritize precise performance monitoring.
| Feature | Assault Fitness AssaultBike Pro X | Rogue Echo Bike |
|---|---|---|
| Length | 51.73 inches | 55 inches |
| Width | 24.52 inches | 29.5 inches |
| Height | 52.51 inches | 52.25 inches |
| Weight | 125 pounds | 123 pounds |
| Materials | Black powder-coated steel | Textured black powder coat steel |
| Console Metrics | Watts, RPM, Speed, Distance, HR | Speed, Distance, HR |
Assault Fitness AssaultBike ProX Customer Reviews
Customer feedback for the Assault Bike ProX on the Assault Fitness website indicates a strong overall satisfaction, with an average rating of 4.6 out of 5 stars. Many users highlight its ease of assembly, low maintenance requirements, and its status as a favored piece of equipment in their home gyms. The bike’s sturdiness and its capacity to withstand demanding workouts are frequently praised.

However, a minority of reviews mention isolated issues, such as a loose left peg reported by one user. Another customer noted the bike was unexpectedly noisy and less stable than anticipated, though these experiences appear to be exceptions rather than the norm.
Final Verdict: Is the Assault Fitness AssaultBike ProX Worth It?
Based on extensive testing and analysis, the Assault Bike ProX stands out as a highly commendable piece of fitness equipment, well worth its investment for dedicated users. Its construction, featuring a heavy-duty steel frame with a protective black powder coat, is engineered for exceptional durability and performance under rigorous conditions. This makes it an ideal choice for individuals seeking a high-intensity, full-body workout machine to enhance both cardiovascular endurance and muscular strength.
The belt-driven system is a significant contributor to the ProX’s smoother and quieter operation, distinguishing it from many traditional fan bikes. While this system demands a continuous effort to maintain momentum, it ultimately contributes to a more engaging and challenging workout. For a wide range of users, from seasoned CrossFit athletes to general fitness enthusiasts looking to push their limits, the Assault Bike ProX offers a compelling and effective training solution.
FAQs
Is the AssaultBike a good workout?
The AssaultBike delivers a highly effective workout by combining air resistance with a belt-driven system, providing a robust challenge for cardiovascular health and muscular endurance. Its design allows for a full-body engagement using both pedals and handlebars, or it can be used for isolated upper-body training by focusing solely on the arm handles.
Is the AssaultBike Pro X belt driven?
Yes, the Assault Bike Pro X features a belt-driven system. This mechanism powers the fan wheel and requires user input through pedaling or moving the handlebars to generate resistance. The belt drive contributes to a smoother and quieter operational experience compared to chain-driven systems.

Is the AssaultBike good for fat loss?
While the AssaultBike alone cannot guarantee fat loss without a complementary caloric deficit, it is an exceptionally effective tool for burning calories. The intense workouts it facilitates can significantly boost metabolic rate, contributing to overall energy expenditure and supporting fat loss goals when combined with a balanced diet.
Is the AssaultBike good for muscle building?
The AssaultBike Pro X can contribute to a modest increase in muscle mass due to its full-body engagement and the resistance provided by the belt-driven system. However, for significant muscle hypertrophy, traditional resistance training with weights like dumbbells or barbells, coupled with an appropriate diet, remains the primary and most effective method.

