Sunny Health & Fitness Performance Interactive SF-RB420031 Recumbent Bike

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Sunny SF-RB420046

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265 lbsManual
8 levels
Frame: 3 years
Parts: 180 days

The Sunny SF-RB420031 is one of the recumbent bikes released by Sunny Health & Fitness in 2022. It’s one of the fitness machines in the Performance Interactive series. Just like the other recently released recumbent bike, the Sunny SF-RB420046, this model has Bluetooth connectivity and is compatible with the SunnyFit app.

Key Features and Specifications

  • Assembled dimensions: 57.1L x 26.6W x 42.9H inches (145L x 68W x 109H cm)
  • Assembled weight: 64.3 lbs (29.1 kg)
  • Weight capacity: 265 lbs (120 kg)
  • Inseam range: 26″ – 35″ (66 – 89 cm)
  • Resistance: Manual magnetic, 8 levels
  • Console: Time, speed, distance, odometer, calories, pulse, goals, scan, goals
  • Extras: Bluetooth, compatible with the SunnyFit app, device holder, resistance cords
  • Warranty: Frame 3 years / Parts 180 days

Frame construction

The Sunny Health & Fitness Performance Interactive SF-RB420031 recumbent exercise bike features a steel frame combining rectangular and cylindrical tubes in its construction. All the tubes are double-coated with a durable paint finish. The color used is gray, this being the only color available for this bike model, at least for the moment.

Needless to say, some of the parts in the bike’s construction are non-metallic, made from a tough thermoplastic material. Some of the most notable ones are the covers of the drive system, the console casing, the tube end caps, and the pedals.

The bike is fairly large. With all the parts assembled, it is approx. 57.1″ (145 cm) long, and 26.6″ (68 cm) wide. Its highest point is the top of the console which reaches approx. 42.9″ (109 cm) above the floor level. It is also recommended to allow at least two feet of clearance all around the bike for easy access.

The bike has a step-through design. There are several inches of space between the seat assembly and the front-drive assembly. Thus, it offers excellent entry and exit possibilities. Not all recumbent bikes have this type of construction, so this can be quite a plus, especially for users with certain disabilities.

The bike is not super heavy but does weigh more than 64 lbs (29 kg). So, you may need to persons for the safe transport of the packaged unit. However, once the bike is assembled, one person can move it with ease. Its front base has transport wheels, and also has a set of adjustable levelers.

Seat and other parts

The Sunny Health & Fitness SF-RB420031 is equipped with a seat designed for superior comfort. Both its seat pad and the backrest pad integrate a thick layer of foam cushioning. On the outside, they feature a thick layer of vinyl which is easy to maintain and moisture-proof as well.

The bike’s seat is adjustable. It attaches to an oblique rail and has a lever-based adjustment system. This means that you can easily adjust it while seated, just by pulling up the lever on the right side. At its highest point, the seat is at approx. 22.4″ (57 cm) above the floor. Also, the applicable user inseam range for this bike is approx. 26″ – 35″ (66 – 89 cm).

The bike is equipped with two sets of handlebars. One attaches to the seat assembly, the other to the front upright bar of the bike. The seat handlebars have pulse sensors. None of the handlebars are adjustable. Both handlebar sets have rubber foam grips for superior contact.

This Sunny recumbent bike is also equipped with a set of resistance cords. The seat handlebars have three attachment rings for the cords, and the rear base bar features a set of small pulleys for them. The cords have simple D-handles with thick foam grips.

Resistance system

The Sunny SF-RB420031 recumbent bike is equipped with a magnetic resistance system. It is not motorized, so you don’t need a power adapter or power cord for it. But on the other hand, the console cannot adjust the resistance automatically and does not have pre-set programs.

The bike features a tension knob that connects to the internal magnetic brake through a steel wire. Therefore, when you turn the knob clockwise, the magnets move closer to the internal flywheel. This increases the internal magnetic drag and the pedaling difficulty. Conversely, if you turn the knob to the left, the gap between the magnets and the flywheel increases, and the pedaling difficulty becomes lower.

The main advantage of the magnetic brake is that the magnets do not touch the flywheel. Thus, the pedaling motion is very smooth, and quiet as well. Plus, the magnets don’t wear out like a felt pad brake, and you don’t need to worry about their replacement or about their lubrication.

The bike offers 8 levels of resistance. The lowest level delivers a fairly light pedaling difficulty, great for recovery training. The 8th tension level provides considerably more pedaling difficulty, simulating a hill climb.

Drive system

This Sunny recumbent exercise bike is equipped with a belt drive system. It integrates a poly-v belt highly resistant to stretching and abrasion. The main plus of this belt drive is that it does not require lubrication. Plus, it generates less vibration than a chain.

The bike features a pretty sturdy crankset, but since it’s not a spin bike, it’s not meant for standing on the pedals. The internal pulley is made of a strong thermoplastic material, while the crank arms are made of metallic alloy, cylindrical, and chrome plated. The pedals are also plastic-made, but they’re pretty durable as well. They have a textured surface and adjustable straps. They are also weighted so they always self-level if you remove your feet from them.

The weight of the internal flywheel is not specified. However, as a general idea, it’s probably around 11 lbs (5 kg), similar to the flywheel of the Sunny Health & Fitness SF-E320047 elliptical. It is perimeter-weighted, though, for improved inertia and motion stability.

The bike’s flywheel is bi-directional. In other words, it allows reverse pedaling. However, coasting is not possible on the bike. When you stop pedaling, the flywheel stops as well. Also, when pedaling in reverse, the resistance remains constant, depending on the selected tension level.


The Sunny Health & Fitness Performance Interactive Series SF-RB420031 recumbent bike is equipped with a fairly simple console. As we’ve mentioned above, it does not have pre-set programs and does not play any role in the bike’s tension adjustment. It features an LCD display without a backlight and also integrates a device holder. It runs on two AAA batteries.

The unit’s display tracks time, distance, total distance, speed, calories, and pulse. Speed and distance are shown in British imperial units. They cannot be set to metric units. The pulse reading function is grip-only. In other words, the console can only track your pulse if you hold on to the sensors integrated into the seat handlebars.

The console unit offers the possibility to set goals for your workouts. For example, you can set a distance goal of 5 miles. If this goal is set, the console will count down from it until it reaches zero. You can also select goals for time and calories burned.

The console unit is pretty easy to use. It has three buttons – Set, Mode, and Reset. The Set button covers the goal-setting function. The Mode button allows you to select the desired function, and the reset button clears all the data on the unit to zero.

Similar to most other Sunny Health & Fitness Interactive series machines, the Sunny SF-RB420031 has Bluetooth connectivity and is compatible with the SunnyFit app. A QR code is included and you can scan it with your phone to install the SunnyFit app. This app is available for both iOS and Android devices. It opens extra features including multiple workout videos and scenic rides based on various locations in the world that sync with the speed of the bike, challenges, and the possibility to track your progress online.

Assembly and Maintenance

The bike’s drive and resistance parts come pre-assembled and attached to the base frame. The other parts do require user assembly. You will have to attach the two base bars, the seat frame, the backrest and bottom seat pad, the front mast, the handlebars, the console, the elastic cords, and the pedals. This may take more than an hour of your time, but the task is fairly simple. Plus, the manual provides step-by-step assembly instructions and schematics, and all the required tools are included.

The bike’s internal parts do not require any maintenance. Thus, you only have to keep it clean and periodically check for loose bolts and parts.

The Pros

  • Sturdy construction – can support users up to 265 lbs;
  • Transport wheels and adjustable levelers on the front base bar;
  • Two sets of handlebars;
  • Elastic cords for arm exercises (3 positions each);
  • Seat handlebars with pulse sensors;
  • Smooth and quiet belt drive system;
  • Large pedals with straps;
  • 8 levels of magnetic resistance;
  • Multi-function console – it tracks time, distance, total distance, calories, speed, and heart rate;
  • Goal setting functions for time, distance, and calories;
  • Bluetooth connectivity – compatible with the SunnyFit app;
  • Device holder included;
  • Easy to assemble;
  • Tools for assembly are included;
  • Little maintenance required;
  • Excellent warranty.

The Cons

  • The console display doesn’t have backlight;
  • No RPM reading on the console;
  • A tablet placed on the device holder will cover the console display.


The Sunny Health & Fitness Performance Interactive Series SF-RB420031 is a recumbent bike made for home use. It features an 8-level manual magnetic resistance system, a comfortable seat with elastic cords, and a console that tracks the most important workout metrics. The console also has Bluetooth connectivity and is compatible with the SunnyFit app. In all, it’s a bike for light to medium-intensity low-impact cardio workouts, muscle toning, and weight loss.

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