Sunny SF-RB4708 Recumbent Bike | Full Motion Arm Exerciser (2023)

The Sunny SF-RB4708 Recumbent Bike from Sunny Health & Fitness has movable handlebars connecting to a frame at the front base, allowing an upper-body workout. The handlebars move simultaneously with the pedals spinning because they are interconnected.

The handlebars and the pedals are crucial for any indoor exercise bike because they are responsible for comfort and suitability. The recumbent bike is one of the most comfortable indoor exercise bikes because of its design and seat.

The SF-RB4708 has a magnetic resistance system. There are eight resistance levels, which are excellent for beginners and medium fitness level individuals. In addition, it is perfect for seniors and folks recovering from an injury or other medical conditions requiring physical therapy. Also, it is a belt-driven bike with smooth and quiet characteristics.

The Sunny SF-RB4708 comes with a simple fitness monitor. The monitor displays workout data such as the time, distance, speed, odometer, and calories burned. It also shows heart rate data via the hand-held EKG sensors integrated into the handlebars.

Learn more in my complete review below!

Sunny SF-RB4708 Recumbent Bike | Full Motion Arm Exerciser (1)

Product: Sunny SF-RB4708 Recumbent Bike

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

Warranty: Frame 3 years / Parts 90 days

(Video) Sunny Recumbent Bike Cross-Trainer Review for Total Knee Replacement Therapy

My rating: 8.75/10

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

Details and Specifications

  • Assembled dimensions: 60L x 25.5W x 52H inches (153L x 65W x 132H cm)
  • Assembled weight: 91 lbs (41 kg)
  • Weight capacity: 350 lbs (159 kg)
  • Seat: Adjustable
  • Pedals: With adjustable straps
  • Resistance: Magnetic, eight levels
  • Fitness Monitor: Time, distance, speed, calories, odometer, pulse, SCAN
  • Warranty: Frame 3 years / Parts 90 days

SF-RB4708 Frame Construction

The Sunny SF-RB4708 recumbent bike features steel tubing frames, and the base longitudinal bar is a single piece. Thus, it results in a superior overall sturdiness. The front and rear base bars attach to the mainframe via bolts.

The front base integrates transport wheels, while the rear features adjustable stabilizers. The middle of the bottom frame bar also has a small stabilizer, which improves the bike’s overall stability. Also, the assembled machine weighs approx. 91 lbs (41 kg), so its balance shouldn’t be an issue.

Although the Sunny SF-RB4708 recumbent bike isn’t a large fitness machine such as a commercial elliptical or a treadmill, it still takes floor space. With the frame fully assembled, it is 60″ (153 cm) long and 25.5″ (65 cm) wide. It requires at least two feet of clearance on the sides and at least one foot of room at the front and rear for unhindered operation. Therefore, it may not fit well in a small space.

All the steel parts in the frame construction come with a corrosion-resistant grey paint finish. But even though its frame coating is corrosion-resistant, the cycle is for indoor use only. If stored or used outside, moisture can eventually damage its internal parts, or the screws and bolts may catch rust.

Sunny SF-RB4708 Recumbent Bike | Full Motion Arm Exerciser (2)

Finally, the bike’s frame is well-constructed; it can withstand up to 350 lbs (159 kg). In addition, the seat base bars are square, not cylindrical, as the handlebars and the other front frame bars, an aspect that increases its overall sturdiness.

Seat and handlebars

The Sunny Health & Fitness SF-RB4708 has a comfortable, contoured seat featuring durable synthetic upholstery. Both the seat and the backrest integrate a relatively thick layer of padding. The whole seat assembly is adjustable, connecting to an oblique rail, which offers an adjustment span between 26.5″ and 34″ (67 – 86 cm).

(Video) Sunny Health & Fitness SF- RB4708 Cross Training Recumbent Bike

Also, the distance between the seat and the closest hand grip varies between 12″ and 36″ (30.5 – 91.5 cm). Thus, the bike can accommodate users between 5’0″ and 6’5″ (153 – 195 cm) with no problem.

Unfortunately, the backrest does not recline, nor does it adjust in any way, independently from the seat. Instead, it is attached directly to the seat bar and will move along with the adjustment rail seat.

This exercise bike features moving handlebars only. Therefore, they do not lock in place and will continue to move as long as the pedals move. However, if you want to exercise using only your arms, you can place your feet on the floor.

SF-RB4708 Drive and resistance

The Sunny SF-RB4708 features a manual magnetic resistance system. It consists of a magnetic pad connected via a steel wire to the lever on the front frame bar. By moving the lever up and down, you increase or decrease resistance.

There are eight resistance settings available. However, the highest resistance levels (7-8) are not too hard. For example, this exercise bike delivers a light to medium workout, which is a good choice for users who require recovery training or elderly users.

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When it comes to the bike’s drive system, like most other models with a manual magnetic resistance system, this particular feature features a belt drive. It uses a stretch-resistant, heavy-duty belt designed to last for many years of use. Since it’s a belt-drive, it doesn’t require any lubrication. The bike’s operation is also very smooth and quiet.

The integrated flywheel is not extremely heavy. Its weight is not specified, but it usually weighs between 8 and 12 lbs for bikes in this range. It’s perimeter-weighted, though, which means it delivers a smooth motion.

Since it’s a recumbent bike, the crankset is not for spin workouts. You will probably break it if you try to pedal while standing up on the pedals. However, it has a sturdy crankset featuring solid steel crank arms.

(Video) Sunny Health & Fitness Magnetic Recumbent Exercise Bike SF-RB4708 Review

The pedals supplied with the bike are made of a durable nylon material; they feature a weighted design and integrate adjustable straps for maximum foot stability. They also have standard threads, so it’s easy to find replacements for them if needed.

This recumbent bike features a narrow Q-Factor, which means the foot positioning onto the pedals is comfortable, without any lateral stress on your knees.

Fitness Monitor

The Sunny Health and Fitness SF-RB4708 recumbent bike has a simple fitness monitor that tracks your pulse, time, distance, speed, and calories. In addition, it has an odometer function, allowing you to set up targets for time, distance, calories, and pulse.

Furthermore, it can only track your pulse via the EKG sensors integrated into the handlebars. It is not telemetric; therefore, it does not work with Polar or other wireless HR chest strap transmitters.

The monitor is easy to operate. First, it has a SCAN function that rotates the workout metrics showing each display for 6 seconds.

You can toggle the SCAN function OFF by pressing the MODE button to keep only the parameter that interests you to view at all times. The SET button allows you to set a value for time, calories, distance, and pulse, while RESET clears all the metrics to zero.

Sunny SF-RB4708 Recumbent Bike | Full Motion Arm Exerciser (4)

The monitor has a sleep mode function which will enter after 4 minutes of inactivity. It will turn back on when you begin pedaling or press any buttons. It’s battery-powered and requires 2 AA batteries, which come with the bike.

The monitor connects to a bar that allows angle adjustment. It also integrates a tablet holder, which can accommodate any tablet.

(Video) Assembly Guide: Magnetic Recumbent Exercise Bike SF-RB4708 | Sunny Health & Fitness

SF-RB4708 Assembly and Maintenance

The core of the bike is pre-assembled and attached to the mainframe. Therefore, you only have to connect the front and rear base bars, the seat’s adjustment rail, the seat, the pedals, the moving arms, and the fitness monitor.

Consequently, it may take up to an hour of your time. Furthermore, the included manual provides the necessary assembly instructions — also, all the tools required for the assembly come with the bike.

Since the bike features a magnetic resistance system, there isn’t any maintenance required for the internal parts. So, the only thing to do for this is periodically check for loose bolts and parts and retightening them as needed.

Please note that the smart device in the image is not included with the bike.


  • Solid frame for a light recumbent bike, with a maximum user capacity of 350 lbs;
  • It comes with adjustable stabilizers on the rear base;
  • Transport wheels on the front base;
  • Step-thru frame design;
  • Mobile handlebars;
  • EKG sensors in each hand grip;
  • Adjustable seat – can accommodate users between 5’0″ – 6’5″;

    Sunny SF-RB4708 Recumbent Bike | Full Motion Arm Exerciser (5)

  • Cushioned seat and backrest for maximum comfort;
  • Quiet magnetic resistance system;
  • Adjustable resistance (8 levels);
  • Weighted pedals with adjustable straps and standard threads;
  • A fitness monitor that can track time, distance, total distance, speed, calories, and pulse;
  • Target settings for time, distance, calories, and pulse;
  • Tablet holder included;
  • The fitness monitor mast is angle-adjustable;
  • Easy to assemble and operate;
  • Transport wheels and rear stabilizers;
  • Little to no maintenance is required.


  • There is no bottle holder;
  • There are no recumbent handlebars (or armrests) at the seat;
  • The fitness monitor LCD doesn’t have a backlight.

Sunny SF-RB4708 Recumbent Bike Summary

The Sunny SF-RB4708 is a heavy-duty recumbent bike for home use. It features a solid steel frame that can support users up to 350 lbs, with moving handlebars, a comfortable seat, and a fitness monitor with target settings for pulse, calories, distance, and time.

Moreover, it’s an exercise bike for users of all levels, great for light to medium-intensity workouts, stamina development, recovery training, and weight loss. Depending on the resistance levels, you can burn up to 5-600 calories per hour. And finally, it’s not an expensive exercise bike, offering excellent value for the price.

(Video) Full Body Recumbent Bike with Full Motion Handlebars Workout

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.


Sunny SF-RB4708 Recumbent Bike | Full Motion Arm Exerciser? ›

Best Recumbent Bike with Arm Exerciser: Teeter FreeStep Recumbent Cross Trainer and Elliptical. Best Hybrid Recumbent Exercise Bike: ProForm Hybrid Trainer. Best Budget Recumbent Exercise Bike: XTERRA SB150. Best Folding Recumbent Exercise Bike: IRONMAN Exerpeutic 400XL.

What is the best recumbent bike with arm exerciser for seniors? ›

Best Recumbent Bike with Arm Exerciser: Teeter FreeStep Recumbent Cross Trainer and Elliptical. Best Hybrid Recumbent Exercise Bike: ProForm Hybrid Trainer. Best Budget Recumbent Exercise Bike: XTERRA SB150. Best Folding Recumbent Exercise Bike: IRONMAN Exerpeutic 400XL.

What are the disadvantages of a recumbent stationary bike? ›

Cons. A recumbent bike may not fully engage the core muscles. Users bear much less body weight while reclining in a recumbent bike, requiring less core strength than when pedaling on an upright exercise bike. Moreover, recumbent bikes only allow a person to assume a specific position.

Does recumbent bike burn belly fat? ›

Recumbent trikes and bikes provide a large area to muster buttock, back, and shoulder. Hence the recumbent trikes and bicycles are a more convenient way to burn calories and reduce belly fat.

Are recumbent bikes worth the money? ›

Yes! You can get a great cardiovascular workout on a recumbent bike. The benefit of this bike, as opposed to an upright, is that it takes less effort to balance and move the pedals. This means less pressure on your joints, all the while, allowing you to get a good cardio workout.

How long should a 70 year old ride an exercise bike? ›

The elderly will experience various benefits from regular exercise, and as an exercise bike is low-impact, it would be a perfect choice for them. As with beginners, the elderly should ride a stationary bike 20 minutes a day. Two to three sessions per week will suffice.

Is recumbent bike better than walking? ›

Although they are both positive ways to achieve active movement, cycling edges it in terms of providing a better workout, burning calories, aiding weight loss and reducing the risk of death by natural causes in the long term.

Why are recumbent bikes not popular? ›

Short history of recumbent bikes

However, the cyclist governing body at the time, Union Cycliste Internationale, made it illegal to use recumbent bikes in events where standard bicycles were used, which almost totally destroyed the popularity of recumbent bikes for decades.

Is it OK to do recumbent bike everyday? ›

On the other hand, if you are using recumbent exercise bikes which don't require as much physical effort, then it would be perfectly fine to use one everyday.

How long should you ride a recumbent bike daily? ›

Recumbent bike workouts can vary in length depending on their style. Warm up for five minutes and pedal at a steady rate for up to 30 minutes, increasing the total workout time as your fitness improves. This workout is an important part of a fitness routine as it promotes recovery, fat loss, and boosts endurance.

How long does it take to see results from a recumbent bike? ›

As a general rule, the average person should start seeing noticeable results after one month of using an exercise bike as part of their regular routine. Exercising is a long-term commitment, so don't be discouraged if you can't see results straight away.

Which is better a treadmill or recumbent bike? ›

In Summary Treadmills vs Recumbent Exercise Bikes

It's no doubt if you are looking to do running training a treadmill is the better option unless you want to some form cross training then a recumbent bike can be a good option especially as it is low impact and does train some different muscles more than running.

Is a treadmill or recumbent bike better for weight loss? ›

A study concluded that treadmills are optimal indoor exercise machines for enhancing energy expenditure. Since a treadmill workout is a weight-bearing exercise, you will burn more calories and belly fat per minute on a treadmill than on a regular stationary bike.

Are recumbent bikes good for seniors? ›

A recumbent bike is excellent for seniors, especially those with back problems. Taking pressure off the spine, including the neck, means less soreness and improved recovery time. Recumbent bikes are also ideal for larger seniors, and most can support up to 300 pounds—others, even more.

Are recumbent bikes good for bad knees? ›

Specifically, recumbent bikes are some of the best exercise bikes for anyone with nagging knee pain. They are ergonomically designed with a semi-reclined position that provides back support and a relaxed cycling position.

Can a 70 year old woman ride a bike? ›

Senior bike riding is perfectly safe and has many health benefits. It will help you lose weight, stay strong, avoid chronic illness, stay mentally alert and live longer.

How many miles on a bike equals 10000 steps? ›

How many miles on a bike equals 10,000 steps? If you're cycling on relatively flat terrain with minimal wind, 10,000 steps would be equal to 15 to 18 miles.

Is cycling good for arthritis in the back? ›

Bike riding is a great form of exercise for people with arthritis. Here's why, and how to cycle safely. Nope, exercise is not going to make your joints feel worse. And yes, you can still ride a bike with arthritis.

Who would benefit most from a recumbent bike? ›

Not only is this good for the elderly or for those who suffer from chronic back pain or other back issues, but it also helps to reduce strain for the average rider. As such, using a recumbent bike may help to encourage you to work out more often or for a longer period of time.

How often should you use a recumbent bike? ›

For weight loss, I recommend a minimum of 3 cardio sessions on your recumbent bike each week. Ideally, you'll be able to fit in 5-6 sessions with at least one day of total rest if you're really serious about losing weight.

Is a recumbent bike better than a treadmill for back pain? ›

The best option of exercise equipment when you have a back injury is an exercise bike. A recumbent bike is ideal because your back is supported by a back rest. This eliminates any jarring, twisting or excess pressure on your back.

Are recumbent bikes bad for your back? ›

As for back pain, notably lower back pain, recumbent bikes are better than upright bikes. A recumbent bike is better for lower back pain since it has a comfortable sitting position and provides back support.

What recumbent bike has the most comfortable seat? ›

Best Overall Recumbent Bike: Nordictrack R35 Recumbent Bike

The R35 has a padded, oversized seat that slides horizontally so you can find the right fit. A vented backrest and lumbar support increase your comfort on the bike, and the wide pedals will support any athletic shoe.

Is a recumbent bike harder to pedal? ›

Because of the comfort of the bike, in comparison to the upright exercise bike, many clients may find it easier to spend more time on the recumbent bike. Also, they're able to push themselves harder and pedal faster, which will result in more calories burned. This is a great option for clients aiming for weight loss.

How many minutes on a recumbent bike equals a mile? ›

If your speed is 10 miles per hour, then you need to divide 60 by 10 to find out how many minutes it would take you to cycle a single mile. Sixty divided by 10 equals 6. This essentially means that you need six minutes to cycle a single mile, if you're going at a speed of 10 miles per hour.

How many steps is 30 minutes on a recumbent bike? ›

Multiply the number of minutes of the activity by the number of equivalent steps per minute. For example, if you bicycled at a leisurely pace for 30 minutes, multiply 116 X 30 to come up with 3,480 steps.

What muscles does the recumbent bike work? ›

What muscles does a recumbent bike work out? Recumbent bikes work your quads, hamstrings, calves, shins, and glutes. You'll also fire up your core muscles including your abs a bit while you work since the action of peddling comes from your abs, obliques, and hip flexors.

Does a recumbent bike work your arms? ›

The push and pull motion of the handlebars on a dual-action recumbent bike allows you to engage upper body muscles such as your lats, biceps and triceps. On both dual-action and regular recumbent bikes, engaging your core is necessary for proper posture to get a full body workout.

What are the benefits of a recumbent bike with arm exerciser? ›

Benefits of Exercise Bikes with Moving Arms

A huge advantage to getting an exercise bike with moving arms is that you're able to work more muscle groups. While you ride, the moving handles help you develop strength in your arms, shoulders, and core while also building your cardio endurance.

Are recumbent bikes better for seniors? ›

A recumbent bike is excellent for seniors, especially those with back problems. Taking pressure off the spine, including the neck, means less soreness and improved recovery time. Recumbent bikes are also ideal for larger seniors, and most can support up to 300 pounds—others, even more.


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