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Sunny Health & Fitness ASUNA 4200 Upright Bike

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ASUNA 4200
sunny health & fitness - asuna 4200
Check Discounted Price
265 lbsMagnetic,
16 levels
590 days

The ASUNA 4200 upright bike it one of the newest exercise bike models for 2016 from Sunny Health & Fitness. It has similar features to the ASUNA 4300 elliptical.  These machines have basically the same console, drive and resistance system. It’s not exactly a basic upright bike, as it features a motorized resistance system and several workout programs on the console. But it’s not a light commercial model either. It’s a bike designed for home use, for light to medium intensity workouts.

Technical Details and Specifications

  • Assembled dimensions: 41L x 21.5W x 56.75H inches (104L x 54.6W x 144H cm)
  • Assembled weight: 99.2 lbs (45 kg)
  • Weight capacity: 265 lbs (120 kg)
  • Handlebar: With pulse sensors
  • Seat: 4-way adjustable
  • Pedals: Weighted, with straps
  • Resistance: Magnetic, motor assisted, 16 levels
  • Fitness computer: 5 workout programs
  • Amenities: Bottle holder, tablet holder
  • Warranty: 90 days limited

Frame construction

This Sunny exercise bike features a frame similar in construction with the ASUNA 4300 elliptical. Its frame is made of steel, with a chassis consisting on a curved rectangular tube, design that not only looks nice, it also adds sturdiness to the bike’s overall construction. All the steel parts are coated with corrosion-resistant paint, silver in color, this being the only version available. The shrouds that cover the flywheel and pulley are made of plastic material. However, they don’t play any role in the bike’s overall sturdiness.

This exercise bike can support users up to 265 lbs (120 kg). This is actually one of the main indicators that it’s not a commercial grade bike, as most commercial models have a weight capacity starting at 300 lbs (136 kg).

The ASUNA 4200 is rather heavy for such a small machine. Despite the fact that it only takes 41″L x 21.5″W (104 x 54.6 cm) of floor space, it weighs 99.2 lbs (45 kg), which basically is more than twice the weight of the average mountain bike. This means the bike is extremely stable. You can be sure that it won’t rock or wobble even if your weight is close to the maximum user capacity, and you engage in a more demanding workout. On top of that, both front and rear base tubes integrate adjustable stabilizers. The front base also has transport wheels to ease the handling of the assembled machine. By leaning the frame forward onto its wheels, you will be handling less than half its weight when you move it. Therefore, its relocation shouldn’t be a problem for anyone.

Handlebars and seat

This Sunny ASUNA upright bike features a solid, thick console mast, which connects to the main frame via four bolts. The bottle holder accessory attaches to it, on the inner side. The handlebars reach up to 56.75″ (144 cm), providing a correct, comfortable workout posture. asuna 4200 - seatThey have a multi-grip design; they’re covered by rubber foam material to provide a comfortable grip. Also, they’re equipped with stainless steel pulse sensors. The height or angle of the handlebars are non-adjustable.

The seat supplied with the bike is 4-way adjustable though. Its post offers and adjustment span of approx. 9″ (23 cm), heightwise. In other words, it can accommodate users between 5′ and 6’5″ (153-195 cm). The saddle itself offers excellent ergonomics. First of all it’s a fairly large seat, 12.75″ (32.3 cm) long, and 12″ (30.4 cm) wide. It doesn’t integrate air-cell cushioning like the seat on the IRONMAN X-Class 310, but does have a layer of padding. It also has a contoured surface. So, as a conclusion here, this seat delivers optimal comfort for prolonged workouts. It’s less likely to experience soreness with this seat, as opposed to most thin, spin bike seats.

The seat’s post is ovalized, which means it’s impossible for it to turn sideways, inconvenience that may occur in bikes with a cylindrical seat post. The seat is easily adjustable. It has large turn-knobs on both bars, easy to grip and turn. In other words, it takes only a few seconds to select your desired height and seat position in relation to the handlebar.

Drive and resistance

This Sunny Health & Fitness upright bike features a belt drive system. This means it supplies a very smooth and quiet pedaling motion. Also, since the transmission is done via belt, you don’t have to worry about its lubrication. asuna 4200 - flywheel and pulley

Another important element of the bike’s drive system is the flywheel. It’s a metallic, magnetic flywheel, with a balanced structure and most of its weight in its perimeter. This means it supplies a steady, consistent momentum, and a great pedaling feel.

The crankset, although it features solid steel arms, and can support the user’s total weight, is not meant for spin workouts. After all, this is an upright bike, designed for seated workouts only. The pedals supplied with the bike are PVC-made, with a weighted structure, and adjustable straps.

This bike has a narrow Q Factor, which means it won’t put any unnecessary lateral stress on your knees. Also pedaling in reverse is possible, and when pedaling in reverse, the console continues to keep track of your workout metrics.

The ASUNA 4200 features a motorized, electronically assisted resistance system. This means it requires to be connected to a power circuit so that you can adjust resistance. Also, resistance adjustment can only be done from the console. A power adapter is supplied with the machine, its cable connecting to the rear part of the machine.

Its resistance system offers 16 distinctive levels. The lower resistance settings are fairly light, great for recovery training or for elderly users, while the top levels do offer the possibilities of more intense workouts. But nonetheless, this is not a heavy-duty commercial grade machine, and as a general idea it provides light to medium workout possibilities.

Computer unit

The ASUNA 4200 upright bike comes with a console unit that offers quite a bit more than the average unit. To begin with, it has a wide, multi-panel LCD display. This means it can show multiple workout values on screen simultaneously, so you won’t have to keep scrolling between sunny asuna 4200 - console unitthem. The display is also LED backlit, providing excellent readability even in poor lighting conditions.

The display indicates time, speed, distance, calories, pulse, RPM, watts, and of course, the selected resistance system. Unfortunately the console unit is not telemetry enabled, and can read pulse only via the sensors mounted on the handlebars. It doesn’t work with HR chest strap transmitters.

The console unit has 5 pre-set workouts plus the Manual mode. The workouts are: Beginner, Advance, Sporty, Cardio, Watt. Some of them have 4 levels of difficulty; for example, the Cardio mode offers 55%, 75%, 90% and TAG (target HR). The Manual mode gives you the possibility to workout freely, adjusting resistance as you like during your workout. It also has goal settings for time, distance and calories.

A Recovery function and a Body Fat function are also available. The Body Fat program as its name suggests, measures your BMI (Body Mass Index). The Recovery program rates your performance based on your pulse at the end of your workout, and determines your level of fitness.

The unit is extremely easy to operate. First of all, it’s powered on when you plug in the machine. It doesn’t require any batteries, as it draws power from your power supply. It has a sleep mode in which will enter after 4 minutes of inactivity on the machine and no pulse reading. It exits sleep mode once you move the pedals. For resistance adjustment, it has a big turn-knob in the middle, which you have to turn clockwise to increase resistance. Recovery and Body Fat have their own keys. There’s also a Reset key for clearing all the values on the console to zero, and a Stop/Start button great to have if you need to interrupt your workout, or alternate elliptical workouts with other workouts. Navigation through the programs is done via the turn knob as well, and the selection of the desired program is done via the big iConsole button.

Finally, the console features a media tray (or tablet holder). It can accommodate tablets of all sizes, or can serve as a phone holder.

Assembly and Maintenance

This exercise bike is extremely easy to assemble. The most problematic parts, i.e. the resistance motor, flywheel, crank system, and belt are already assembled, attached to the frame and covered by the PVC shrouds. Therefore, you only have to attach the base bars, the seat, the console mast, console and connect the wires. Tools and manual are supplied. The whole assembly shouldn’t take more than 45 min.

Since the bike has a belt drive system, you don’t have to lubricate its internal parts. In fact, you don’t really have to do much for maintenance. The periodic check of its joins, bolts and nuts is recommended though.

The Pros

  • Solid construction, elegant design;
  • 4-way adjustable, wide, padded seat;
  • Multi-grip handlebar;
  • Grip pulse sensors;
  • Weighted pedals, with straps;
  • Balanced flywheel providing a smooth and steady pedaling motion with a consistent momentum;
  • Smooth and quiet drive;
  • 16 levels of resistance;
  • 5 pre-set workouts, some of them with multiple difficulty levels;
  • Goal tracking;
  • Recovery and BMI functions;
  • Tablet holder included;
  • Bottle holder included; asuna 4200 - sunny health and fitness
  • Basically maintenance free;
  • Fairly easy to assemble.

The Cons

  • Console can’t track pulse via a HR strap transmitter;
  • A tablet placed on the media holder may obstruct the view of the console display and the buttons, which may be an inconvenience.


The Sunny ASUNA 4200 is a mid-range upright bike, designed for home use. It offers 16 levels of automatic magnetic resistance. Its console has 5 workout applications, each one with several difficulty levels. It also has BMI and Recovery functions. It’s great for cardio training, recovery training, muscle toning and weight loss. You can actually burn up to 5-600 calories per hour on this exercise bike, depending on which difficulty settings or which resistance level you use. Finally, it costs less than $400, thus we can safely say that it offers a decent price / value ratio.

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