Circuit Fitness AMZ-594U Upright Bike – Withstands Daily Use!

The Circuit Fitness AMZ-594U Upright Bike showcases a heavy-duty frame that effectively resists scratches and chips, guaranteeing you reliable equipment that can withstand daily, heavy use. This bikes engineered structure facilitates proper body form during movement, enabling your workout to take maximum effect on your specific target areas.

The Circuit Fitness AMZ-594U comes with an automatic 24 level magnetic resistance system. These resistance settings can be selected on the LCD screen, allowing you to control and customize your cardio training according to your skill level.

Additionally, the AMZ-594U has 15 preset programs that simulate the effects of biking on different terrains. The LCD also tracks time, pulse rate, current speed, distance traveled, and calories burned for easier progress monitoring.

The bike’s large seat can be easily adjusted to accommodate users of different body sizes, allowing it to conform to each user’s height for exact motion. Also, the  AMZ-594U comes with textured pedals and safety loops that stabilize your feet for comfortable cycling.

Learn more in my complete review below

Circuit Fitness AMZ-594U Upright Bike
Circuit Fitness AMZ-594U Upright Bike

Product: Circuit Fitness AMZ-594U Upright Bike

Price: For a great deal on this bike, merely go here on Amazon

Warranty: 2 years limited

My rating: 8.5/10

Amazon Affiliate Disclosure: I may earn commissions on purchases made through links in this post.

Details and Specifications

  • Assembled dimensions: 37.5L x 22W x 54H inches (95L x 56W x 137H cm)
  • Shipping weight: 79 lbs (35.8 kg)
  • Supported weight: 300 lbs (136 kg)
  • Drive: Belt
  • Resistance: Eddy current, 24 levels
  • Console: 15 programs, BMI, Recovery
  • Extras: USB charging port, sound system, bottle holders, tablet holder
  • Warranty: Frame 2 years

AMZ-594U Frame construction

The Circuit Fitness AMZ-594U upright exercise bike features a sturdy steel frame with ABS covers for the drive and resistance elements. It has a compact structure with a relatively small footprint of 37.5″ long (95 cm) and 22″ (56 cm) wide. However, it is advisable to leave at least two feet of clearance all around it for safe usage.

The main body of the bike has a step-through design. Not all upright bikes have this feature, so it’s quite a plus, especially for users with specific disabilities because it considerably eases the positioning of the user on the seat.

The net weight of the bike is not specified, but considering that its shipping weight is 79 lbs (35.8 kg), it probably weighs more than 70 lbs (31.7 kg). This is considerably more than the average road bike weighs. Plus, it has a low center of gravity, which adds a lot of stability.

Both base tubes of the bike come with adjustable levelers. They allow you to stabilize the unit on any floor correctly. Plus, the levelers rest on rubber pads that improve the unit’s grip on the floor, preventing it from sliding. Therefore, it’s not necessary to place and use the bike on a mat.

The front base bar comes with transport wheels. Although the bike is not heavy, these still improve its portability. By using the wheels, you won’t have to handle more than 50% of its total weight.

Last but not least, all the metallic bars in the composition of the bike’s frame are powder coated with a durable paint finish. The color used is black, this being the only color available for this bike.

Circuit Fitness AMZ-594U Upright Bike

Seat and handlebars

The Circuit Fitness AMZ-594U includes a saddle designed for extra comfort. First of all, it integrates approx. 1.4″ (3.5 cm) of foam cushioning, a bit more than some other bikes. The top cover is durable, double-stitched faux leather.

It is contoured for extra breathability. It is also relatively large, approx. 10.5″ (26.6 cm) wide, and 11″ (28 cm) long, offering plenty of contact surface.

The saddle has a standard (collar-based) attachment system. This is also a plus because if you ever need to replace it, compatible options are widely available.

The bike’s seat offers 4-way adjustability (up, down, front, back). Its upright post features nine adjustment positions and provides a total adjustment span of 10″ (25 cm), from 28″ (71 cm) above floor level to 38″ (96.5 cm). Also, its slider offers approx — 4″ (10 cm) of front-to-back adjustment.

Therefore, the bike should be able to accommodate users up to 6’5″ (196 cm) with no problem. Also, the seat can support users up to 300 lbs (136 kg).

The AMZ-594U upright bike comes with a multi-grip handlebar. It is fully rubberized to provide a superior grip and extra comfort. Also, its side grips incorporate metallic pulse sensors, and the console has a pulse reading function.

The bike’s handlebar is adjustable. It attaches to the upright post through a knob, which allows you to adjust its angle. However, the vertical position of the handlebar is non-adjustable.

AMZ-594U Drive and resistance

The Circuit Fitness AMZ-594U upright bike has an automatic magnetic resistance system (or eddy current brake). This means you have to attach it to a power outlet, and an adapter is (included) with the bike. It also means that the console can adjust the bike’s resistance automatically, depending on the program in use.

Circuit Fitness AMZ-594U Upright Bike
Circuit Fitness AMZ-594U Upright Bike

The bike’s resistance system consists of an internal magnetic brake and a servo motor. As you adjust the resistance from the console, the brake increases the pull of the magnets, which increases the pedaling load.

Just like the recumbent version, the AMZ-594U exercise bike makes available 24 distinct resistance settings. The first few levels offer a light pedaling difficulty great for users who require recovery training. Conversely, the tension levels above 20 deliver considerably more resistance simulating a steep climb.

Most magnetic exercise bikes have a belt drive system, and the AMZ-594U is no exception. It comes with a poly-v drive belt that delivers a very smooth and quiet pedaling motion. Also, since it’s a belt drive and not a chain, it does not require lubrication.

The weight of the internal flywheel is not specified, but considering the overall weight of the bike, it should be around 20 lbs (9 kg). It has a balanced structure for a bit of extra inertia and a steady pedaling feel. It is also bi-directional, so you can pedal in reverse if you want.

The bike’s crankset comes with solid steel arms. However, since this is an upright bike, standing on the pedals is not recommended, even if it can support you with no problem. That’s because the pedals are ABS material, and too much pressure may damage them.

On the other hand, the pedals are self-leveling; they also have adjustable straps and a textured surface for improved foot stability.


The AMZ-594U features an LCD with an LED backlight that tracks multiple workout metrics, including time, distance, RPM, speed, watts, calories, and pulse. Speed and distance can be shown either in metric or English units.

However, it is not telemetric and does not have a Bluetooth function. So, to track your pulse, you must hold on to the sensors integrated into the handlebars.

Circuit Fitness AMZ-594U Upright Bike

The console is not compatible with any fitness apps but does offer 15 distinct workout programs. The first one is Manual mode. If selected, the Manual mode gives you the possibility to choose workout targets for time, distance, calories, and pulse.

The next 12 workout programs divide into three categories: Beginner, Advanced, and Sporty, and each one has four preset programs. Their workout profiles display on the console section right above the screen.

The 14th and 15th programs are for Cardio and Watts. The Cardio program has three preset HRC values (55%, 75%, and 90%), but also gives you the possibility to set a custom HRC value. The Watts program is for constant work, great for losing weight and toning muscles.

A Recovery function and a BMI program are also available. They both have quick selection controls on the console. The BMI function calculates your body fat percentage based on your height, weight, and gender input. This is not bad if you want to keep an eye on your weight loss progress.

The Recovery function helps you establish your fitness level. It measures the amount of time it takes your pulse to return to normal after the workout, and based on it; it will rate your performance between F1 (excellent) and F6 (poor).


Apart from the workout programs and the aforementioned fitness-oriented features, the console also has several amenities. First of all, it integrates two speakers so you can connect your smartphone or tablet so you can listen to your music through the console.

The top side of the console has a foldable tablet holder. On the lower section, there is a cup or bottle holder. And finally, a USB charging port for your device is also available.

AMZ-594U Assembly and Maintenance

The bike’s base unit comes pre-assembled. Thus, you only have to attach the two base bars, the front upright bar, the console, the handlebars, the pedals, the seat post, and the seat. The task is pretty straightforward and shouldn’t take more than an hour. The manual provides clear assembly instructions, and a set of essential tools is also (included) with the bike.

Once fully assembled, you only have to keep it clean and periodically check for any potential loose parts. The internal parts do not require any lubrication.


  • Solid construction, 300 lbs weight capacity;

    Circuit Fitness AMZ-594U Upright Bike
    Circuit Fitness AMZ-594U Upright Bike
  • Transport wheels on the front base;
  • Adjustable stabilizers on both bases;
  • Adjustable multi-grip handlebar;
  • Pulse sensors;
  • 4-way adjustable seat;
  • Large, cushioned saddle;
  • Silent belt drive;
  • Zero friction eddy current resistance;
  • Power adapter included;
  • 24 resistance settings;
  • Weighted pedals with adjustable straps;
  • The mid-range console which tracks time, distance, total distance, RPM, watts, calories, and pulse;
  • LED-backlit display;
  • 15 workout programs;
  • Recovery function;
  • BMI function;
  • Goal setting functions for time, distance, calories, and pulse;
  • Foldable tablet holder;
  • Bottle holder included;
  • Sound system;
  • USB charging port;
  • Little maintenance required;
  • Easy to assemble.


  • A hydration bottle is not (included) with the bike;
  • No online connectivity.

Circuit Fitness AMZ-594U Summary

The Circuit Fitness AMZ-594U is an upright exercise bike made for home use. With this purpose in mind, it features a 24-level eddy current resistance system, a comfortable 4-way adjustable seat, and a large LCD console with 15 programs and multiple other functions. It’s an excellent trainer for light to medium-intensity cardio workouts, interval workouts, muscle toning, and weight loss.

I hope you found this article helpful and informative. If you have anything that you’d like to share or any opinions about my website, please do speak up. I look forward to your comments, questions, and the sharing of ideas.

Recommended articles:

3 thoughts on “Circuit Fitness AMZ-594U Upright Bike – Withstands Daily Use!”

  1. I love the adjustable seat and the fact of having 15 programs pre-loaded. I hate having to program routines myself. Being highly portable and light-weighting is also a plus. Not having online connectivity is not a big deal to me; getting it in front of my smart TV and problem solved.

    The two years of warranty is excellent for this type of equipment (2 years is enough to define if it’d be right for you for the following 20 years ahead).

    Thanks for a great and very complete review! 

  2. You got me with this article. My brother had a football accident and suffered a ligament rupture on his right knee. After six months in which he didn’t move, he must now start the recovery period. The doctor recommended that he come to the hospital and use the bikes from the hospital’s gym. Because the hospital is very far away, I would like to buy him this equipment. You have given a helpful review on the Circuit Fitness AMZ-594U Magnetic Upright Exercise Bike with 15 preset workout programs. The price of $ 319.99 is meager, considering its benefits. I hope to help my brother with this.

    I wish you all the best! 


Leave a Comment

This site uses Akismet to reduce spam. Learn how your comment data is processed.