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Sunny Health & Fitness SF-RB4616 Magnetic Recumbent Exercise Bike Review

The Sunny Health & Fitness SF-RB4616 Magnetic Recumbent Exercise Bike is a simple and lightweight exercise machine; however, it has an impressive maximum user weight capacity of 300 lbs. and 8 magnetic resistance levels.

Its console is simple to navigate. Weighing only around 59 lbs. and being low-priced, SF-RB4616 is perfect for those who neither have a big space nor a big budget, but want to exercise and keep themselves fit.

Published: January 21, 2022.

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Specifications of Sunny Health & Fitness SF-RB4616 Magnetic Recumbent Exercise Bike

- Dimensions when assembled: 46 x 24.5 x 38 inches (117 x 61 x 96.5 cm) (L x W x H)

- Dimensions when folded: 46.9 x 9.8 x 20.9 inches (119 x 25 x 53 cm) (L x W x H)

- Weight: 58.7 lbs. (26.62 kg)

- Maximum user weight capacity: 300 lbs. (136 kg)

- Resistance: Manual, magnetic, 8 levels

- Warranty: 3 years on structural frame, 180 days on other parts and components

Features of Sunny Health & Fitness SF-RB4616 Magnetic Recumbent Exercise Bike


Assembly of the Sunny Health & Fitness SF-RB4616 is quite simple and straightforward. But it’s time-consuming. It takes around 1 and a half hour to put it together.

Users need to first attach the front and rear stabilizers to the main frame, then attach the seat cushion and backrest cushion to the cushion frame, then insert the brake handle into the eccentric shaft hole, then attach the handlebar to the cushion frame and then attach the cushion frame to the main frame. Then they should connect the hand pulse sensor to the hand pulse wire.

Next, they should attach the front mast to the main frame. Then they have to set the tension control knob and connect the tension control wires. Then they will need to connect the wire of the console to the hand pulse wire and trunk wire and attach the console to the front mast.

Finally, they have to connect the left and right pedals onto the left and right cranks and that completes the assembly. All the assembly instructions are given in the user manual in detail and all the necessary hardware and tools are included. Nuts and bolts are nicely packed in separate bags with the respective number on them, so there is no chance of confusion.

Frame and Construction

The frame of the Sunny Health & Fitness SF-RB4616 is made of alloy steel and is pretty durable for a home exercise bike. It’s one piece that adds to the sturdiness. The frame is coated with rust-resistant gray paint.

Step-thru Design

This bike features a step-thru design which is especially helpful for the elderly and disabled patients to access and exit the bike.


The Sunny Health & Fitness SF-RB4616 is not very large and measures 54.4” (138 cm) in length and 26” (66 cm) in width. Thus it’s ideal for those who don’t have a large space.


Thanks to the transportation wheels on its front stabilizer, the Sunny Health & Fitness SF-RB4616 can be moved easily to the user’s desired location by holding the rear stabilizer and lifting the bike.


Despite weighing only 58.7 lbs. (26.62 kg) this Sunny exercise bike offers excellent stability. Users can adjust the end caps placed beneath the rear stabilizer by turning them clockwise and make the bike perfectly stable. But as a safety precaution, it’s recommended to keep the bike on a rubber mat.


The console on this Sunny recumbent bike is pretty simple to use as it has only 3 buttons, viz. Mode, Set, and Reset.
By pressing the Mode button, users can choose functions on the display.


By pressing the Set button, they can set values of Distance, Time, Calories, and Pulse when not in Scan mode.
By pressing the Reset button, they can reset Distance, Time, and Calories to zero when not in Scan mode. By pressing and holding this button for a few seconds, they can reset all the values.

The digital LCD display on the console will show workout metrics like Time, Distance, Speed, Calories, Pulse and Odometer. It also has a Scan function with which all the values will keep rotating with each value showing for 4 seconds. But users cannot reset the odometer by pressing the Reset button. The odometer can be reset by removing the batteries.

The console has a countdown function for Time, Distance, and Calories. Users can set a value by pressing the Set button and then start pedaling. The console wills countdown from the set value. Once the countdown is done, it will start counting from zero automatically.

The console needs 2 AAA or UM-4 batteries to function. It is powered when users press any button or start pedaling. It will automatically shut off after around 4 minutes of inactivity.

Seat and Backrest

The seat of the Sunny Health & Fitness SF-RB4616 is pretty large and thus comfortable. It measures 14.5” (37 cm) in length and 11” (28 cm) in width. The seat, as well as backrest, are furnished with a 1.5” (3.8 cm) thick foam cushion and thus offer optimum comfort.

The seat can be adjusted back and forth on a horizontal rail and users can adjust with a seat adjuster placed under the seat on the right side. Thus users can make the adjustment while sitting on the bike.

The adjustment span of the seat accommodates users with an inseam from 29” to 38” (73.66 to 96.52 cm). This means that users of height between 5’0” and 6’5” (153 – 196 cm) can be accommodated on this bike.

The backrest can be adjusted only with the seat and not independently. But it offers excellent lumbar support due to its sturdy backbone.



There are two sets of handlebars on the Sunny Health & Fitness SF-RB4616 – one attached to the seat assembly and the other attached to the console mast. The seat handlebars have pulse sensors incorporated in them.

Resistance and Drive

The Sunny Health & Fitness SF-RB4616 is equipped with a manual magnetic resistance system. So, users don’t need to connect the bike to an electrical outlet. They can adjust the resistance level manually with a tension knob placed on the front mast under the console. There are 8 levels of resistance on the bike.

To increase the resistance level, users have to turn the knob to the right (clockwise), whereas to reduce it, they have to turn the knob to the left (counterclockwise).

Just like other recumbent bikes with a magnetic resistance system, this bike too comes with a belt drive system. Its internal belt delivers a smooth and quiet operation. Unlike a chain drive, it even doesn’t require any lubrication.


The Sunny Health & Fitness SF-RB4616 features a very durable crankset and its weighted pedals are self-leveling to make it easy for the users to place their feet on them and in the straps. They feature a structured surface to prevent users’ feet from slipping and have adjustable straps.


Since the internal parts don’t require any lubrication, the Sunny Health & Fitness SF-RB4616 needs very low maintenance. Users just have to keep the bike clean by regularly wiping it and check for any loose bolts and parts, and tighten them if required.

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Pros of Sunny Health & Fitness SF-RB4616 Magnetic Recumbent Exercise Bike

- Sturdy construction

- Step-thru design for easy access and exit

- Small footprint

- Transportation wheels for easy relocation

- Excellent stability

- Adjustable, wide, padded, and comfortable seat and backrest

- Two sets of handlebars

- Heart rate sensors integrated with the seat handlebars

- Easy to use console with digital LCD display

- 8 levels of magnetic manual resistance

- Belt drive system that delivers smooth and quiet operation

- Durable crankset and weighted self-leveling pedals

- Easy assembly

- Very low maintenance

Cons of Sunny Health & Fitness SF-RB4616 Magnetic Recumbent Exercise Bike

- No telemetric heart rate monitoring

- No add-ons like bottle holder, tablet holder, workout fan, or speakers

- Assembly can be time-consuming

Bottom Line

sunny sf rb4616 mThe Sunny Health & Fitness SF-RB4616 Magnetic Recumbent Exercise Bike is designed for home use; still, it’s pretty sturdy and delivers an effective workout experience.

Although it doesn’t offer a lot of bells and whistles, it offers just what any fitness lover would expect, the right exercise. It has 8 levels of manual magnetic resistance which offer a great range of challenges from easy to difficult.

It also offers excellent stability with its alloy steel frame and rear stabilizers. It features pulse rate sensors to help users monitor their heart rate. Step-thru design allows anyone to access or exit the bike easily.

Its seat and backrest are spacious and cushioned to offer optimum comfort while exercising. Due to its small size, it’s perfect for users with a small space.

Thus users can use this bike for building muscles and stamina, and cardiac strength, and burn calories, and lose weight, and elderly, ill, or disabled users can use it for recovery training. Users get all these benefits for a very low price.

So, anyone looking for having an effective yet comfortable workout at home with a compact and affordable exercise machine should consider buying this recumbent bike.

For more reviews and recommendations, feel free to check the Sunny Health & Fitness SF-RB4616 Magnetic Recumbent Exercise Bike Amazon link (link opens in the new window).

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