Sunny SF-RB4616 Recumbent Bike | Efficient and Cost-Friendly

With the Sunny SF-RB4616 Recumbent Bike from Sunny Health and Fitness, you’ll keep your workouts on track with an efficient and cost-friendly recumbent bike that is comfortable to use and adequately gets the job done.

The padded seat of the SF-RB4616 is full and adjustable to prevent backaches by keeping your posture upright. With the help of the adjustable handle found on the lower side of the seat, you can adjust the seat forward, backward, upwards, and downwards while sitting.

Right beneath the handlebars, you will find a knob that lets you choose between 8 different types of resistances. The knob is adjustable; by turning it, you can alter the tension in the knob and subsequently increase or decrease the total resistance. Using this feature, if you increase the resistance, you will have to pedal harder to burn the weight.

The Sunny SF-RB4616 has everything a reliable and decent recumbent bike could offer. With the eight-level resistances, adjustable chair, heart-sensor handrails, and a fitness monitor that does its job at tracking readings, you are getting everything and maybe a little more for the nominal price you’re paying.

Learn more in my complete review below!

Sunny SF-RB4616 Recumbent Bike
Sunny SF-RB4616 Recumbent Bike

Product: Sunny SF-RB4616 Recumbent Bike

Price: For a great deal on this bike, merely go here to Sunny Health &

Warranty: Frame 3 years / Parts 90 days

My rating: 8.5/10

Affiliate Disclosure: As a Sunny Health & Fitness Affiliate Program participant, I earn commissions on purchases made through links in this post. Full disclosure

Details & Specifications

  • Assembled dimensions: 54.4L x 26W x 39.5H inches (138L x 66W x 100H cm)
  • Assembled weight: 59 lbs (27 kg)
  • Weight capacity: 300 lbs (136 kg)
  • Pedals: With adjustable straps
  • Drive: Belt
  • Resistance: Magnetic, eight levels
  • Fitness Monitor: Time, distance, speed, calories, odometer, pulse, SCAN
  • Warranty: Frame 3 years / Parts 90 days

SF-RB4616 Frame Construction

The Sunny SF-RB4616 is for home use but has a durable construction with a steel frame that can hold up to 300 lbs. In addition, the main chassis of the bike is one piece, not two parts, like some other bikes. This particular aspect leads to improved overall sturdiness.

All the steel bars within the bike frame come coated with a corrosion-resistant paint finish. The color used is metallic gray, the only color available for this unit.

Sunny SF-RB4616 Recumbent Bike

Compared to other fitness machines, this Sunny exercise bike isn’t giant. However, it still is approx 54.4″ (138 cm) long and 26″ (66 cm) wide. Plus, it is advisable to assign a usage area for it of at least 70″ x 50″ (178 x 127 cm) for safe operation and ease of access.

Speaking of ease of access, the Sunny SF-RB4616 features a step-through design. This type of frame construction promotes easy entry and exit, which may be extremely important for users with specific disabilities.

The bike isn’t hefty. The fully assembled frame only weighs approximately 59 lbs (27 kg). Therefore, one person can carry and assemble the bike. Also, its front base features wheels that facilitate its relocation.

Like most recumbent bikes, the Sunny SF-RB4616 offers excellent stability. Plus, its rear bar comes equipped with a set of adjustable polygonal stabilizers. You can rotate any of these two stabilizers to level the bike perfectly. However, placing and using the bike on a rubberized mat is advisable.

Seat & handlebars

The Sunny SF-RB4616 features a reasonably large seat. It’s 14.5″ (37 cm) wide and 11″ (28 cm) deep. The seat and the backrest have a 1.5″ (3.8 cm) thick foam padding to provide optimal comfort—the upholstery is on both a durable and perspiration-proof vinyl material.

If you’re wondering, the backrest is not adjusted independently from the seat. It doesn’t recline, nor can it be positioned lower or higher. However, it has a very sturdy backbone and delivers comfortable lumbar support.

The whole seat assembly is 2-way adjustable. It is attached to a slider that can move back and forth on its base rail bar. In addition, the adjustment system features a lever placed on the right side under the seat. Therefore, you can adjust the seat position while you are seated.

Sunny SF-RB4616 Recumbent Bike
Sunny SF-RB4616 Recumbent Bike

The seat’s adjustment span can accommodate users with an inseam between 26″ and 33.9″ (66 – 86 cm), in other words, users between 5’0″ and 6’5″ (153 – 196 cm). In addition, the seat assembly is durable enough to support users up to 300 lbs (136 kg).

This Sunny recumbent bike comes equipped with two sets of handlebars. One is attached directly to the seat assembly, and these handlebars incorporate pulse sensors so the fitness monitor can track your pulse.

The other is connected directly to the monitor mast. This handlebar set is relatively simple but slightly curved to deliver a more comfortable grip for your wrists. However, these handlebars do not have pulse sensors. Instead, a layer of rubber foam material covers both sets of handlebars.

SF-RB4616 resistance & drive

This Sunny recumbent exercise bike features a manual magnetic resistance system. Therefore, you don’t have to connect it to a power source. Instead, the tension dial on the monitor mast makes the resistance adjustment manually.

Furthermore, the fitness monitor does not play any role in the resistance adjustment; it’s merely a fitness monitor that tracks your distance traveled, speed, pulse, etc.

The resistance system consists of a small magnetic brake attached to the dial on the monitor mast. As you turn the knob clockwise, the magnetic brake will move closer to the metallic flywheel, increasing the internal magnetic field’s intensity. Thus, you will benefit from a higher resistance during pedaling.

There are eight levels of resistance available. The first levels offer a very light workout, great for users who require recovery training. However, the top resistance levels (7-8) are not too hard. However, they offer a mid-range resistance that can help you break a sweat.

Like most other exercise bikes with a magnetic resistance system, the Sunny SF-RB4616 features a belt drive system. The internal belt is quite durable and delivers smooth, silent operation. Also, as opposed to a chain drive, it does not require lubrication.

Sunny SF-RB4616 Recumbent Bike

The weight of the internal flywheel is not specified. But considering that the bike’s weight is only 59 lbs (27 kg), the wheel should weigh between 8-12 lbs (3.6 – 5.4 kg). It’s a balanced flywheel that promotes a steady pedaling motion.

The bike comes equipped with a durable crankset. However, it is not a bike for standing up on the pedals. Any workout of this sort may damage the internal components.

The pedals feature a weighted design. As a result, they should always turn face-up when you remove your feet from them. They come with adjustable straps and have a non-slip surface. Their threads are also standard, so you can easily find replacements for them if needed.

Fitness monitor

The Sunny SF-RB4616 includes a fitness monitor. This monitor offers more than the basic units, as it has an odometer and pulse reading functions. An LCD can track time, distance, total distance (odometer), speed, calories, and pulse. Unfortunately, it doesn’t offer user input data, such as weight, age, or gender, so the calorie reading isn’t too accurate.

Unfortunately, the monitor is not telemetric. Therefore, it cannot read your pulse via a wireless HR chest strap transmitter. Instead, you must use the seat handlebars’ EKG sensors to benefit from a pulse reading.

The fitness monitor is easy to operate. It has only one button that toggles the SCAN function On and Off and serves as a Power On button and a Reset button. When the SCAN function is on, the LCD will show each workout metric for several seconds, then move to the next, and so on.

By toggling the SCAN function Off, you can select any of the workout metrics to be shown on display all the time. To reset all the workout metrics on the monitor, you must press and hold the button for a few seconds.

The battery-powered monitor uses two AA-type batteries that come with the bike. It also has a sleep mode which will enter after several seconds of inactivity on the bike. After that, you can either press the button or begin pedaling to turn it on.

Sunny SF-RB4616 Recumbent Bike
Sunny SF-RB4616 Recumbent Bike

SF-RB4616 Assembly & Maintenance

The main body of the bike comes pre-assembled. However, there still are parts that require assembly. For example, you will have to attach the two base bars to the mainframe, the seat, the console mast, the handlebars, the fitness monitor, and the pedals.

Consequently, it may take more than an hour of your time. However, the included manual provides clear assembly instructions and schematics. In addition, the tools required for the assembly come with the bike.

This exercise bike features a magnetic resistance system; thus, there isn’t any maintenance required for the internal parts. The only thing to do in this matter is periodically checked for loose bolts and parts and retighten them if necessary.


  • Sturdy, steel frame, capable of supporting users up to 300 lbs;
  • Transport wheels on the front base;
  • Adjustable base stabilizers on the rear base;
  • Step-through frame design for easy access to the seat;
  • Both front and seat handlebars (other recumbent bikes don’t have front handlebars);
  • Pulse sensors integrated into the seat handlebars;
  • Padded seat and backrest for optimal comfort;
  • Quiet magnetic resistance system;
  • Adjustable resistance offering distinctive eight levels;
  • Weighted pedals with adjustable straps;
  • Fitness monitor that can track time, distance, total distance, speed, calories, and pulse;
  • Lightweight, easy to handle;
  • Reasonably easy to assemble;
  • Little to no maintenance is required.


  • There is no device holder;
  • The fitness monitor LCD does not have a backlight.

Sunny SF-RB4616 Summary

The Sunny Health & Fitness SF-RB4616 is a recumbent bike for home use. It features a manual magnetic resistance system, a belt drive, and a fitness monitor. Furthermore, it comes equipped with a comfortable and adjustable seat. Additionally, it has a reasonably sturdy frame, rated for a maximum user weight limit of 300 lbs.

It’s a great trainer for recovery training, muscle toning, and stamina development. This bike can also lose weight if you undergo a more intense cardio regimen on the 7-8 resistance settings. In all, it’s an excellent and affordable exercise bike, currently available for around $200.

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

Please remember that you should consult your physician to determine if you have any medical or physical conditions that could risk your health and safety or prevent you from using the equipment properly. In addition, your physician’s advice is essential if you are taking medication that affects your heart rate, blood pressure, or cholesterol level.

9 thoughts on “Sunny SF-RB4616 Recumbent Bike | Efficient and Cost-Friendly”

  1. Oh, with all of this quarantining, you KNOW I’m guilty of not getting enough exercise, and I know I won’t be going to a gym for a long time (high-risk group). Now is the perfect time for me to get a bike. I usually walk for exercise if I’m out and about, but I think for being at home, a bike is much more versatile than a treadmill. Also generally cheaper and always more compact. The Sunny Recumbent Bike looks like a good option for me, as I can easily afford it, and it has all of the features I need. I’m also a huge Amazon user. Thank you!

  2. Thank you so much for sharing us an interesting and excellent article. It is truly admirable that you have demonstrated this topic so well in your review. I have learned a lot by reading your article and gained a lot of cognition about Sunny SF-RB4616 Recumbent Bike. Of the points mentioned in your report, I like seat & handlebars. I think this model bike is perfect for exercising at home.

    I would like to share the subject of your article in my Facebook group so that everyone can know about exercise equipment and purchase this type of exercise equipment.

  3. This looks like a comfortable exercise bike. It reminds me of the one I had years ago. I’d pedal for 30 minutes each day and cycled about 10km a day to work and back. I was the fittest I have ever been and loved my trip through the city in the early morning hours before the hustle and bustle of the day started. Gosh, I miss those trips thinking about it now. 

    • Hi Monika, thanks for stopping by and sharing your thoughts with us. It sounds like you have fond memories of those times. From now on, you should create new fond memories to look back on.

      Kind regards, Robert

  4. I love these kinds of bikes, easy to set up, and it helps me build up leg muscles. I know I need that. And the best part of this article is that the bikes look very comfortable to be on, while others don’t help much in that way. 

    I will have to look into maybe trying one of these out myself. Thanks for this post; it’s beneficial. 

    All the best, Rebekah. 


    • Hi Rebekah, thanks for stopping by and commenting. If I can be of any assistance in the future, would you please let me know? I’d be happy to help.

  5. This looks like the home bike I need! You get quite a lot for such an excellent affordable bike! I love the front wheels so that I can move them easily anywhere in the house. I am tiny, so I need a piece of equipment that I can handle all by myself! It sounds like a very comfortable bike as well. Thank you for this review; it helped me making my decision and considering buying it! 

    • Hi there, thanks for stopping by. Would you please let me know if you ever have any questions or need help? I’d be happy to assist.

      Kind regards, Robert


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