Sunny Evolution Pro II SF-B1986 | Designed for Speed & Stability

I want to introduce you to the newest evolution of performance-oriented indoor cycles – The Sunny Evolution Pro II SF-B1986. The 40 lb flywheel provides momentum while riding on this low-impact cycling machine. In addition, the smooth and silent belt-drive mechanism guarantees your cycle exercise will be quiet, particularly in shared spaces.

Sunny SF-B1986 bike features a commercial-quality frame, has a maximum user weight capacity of 330 lbs (150 kg), and can take whatever intense fitness routines you could throw at it. In addition, the 40-pound flywheel is designed for speed and stability to create more momentum for extended periods, keeping your workout going.

It comes equipped with Sunny Health & Fitness’ most advanced fitness monitor that tracks: speed, avg speed, max speed, cadence (rpm), avg cadence, max cadence, distance, target distance, time, calories, race, target time, and pulse. However, the pulse reading function is grip contact only. Unfortunately, the monitor cannot communicate with a wireless heart rate chest strap.

Achieve a full-body workout by riding and lifting dumbells simultaneously on the Sunny Evolution Pro II SF-B1986. Switch between intervals of intense riding and upper body exercises to mix things up and add variety to your routine.

Learn more in my complete review below!

Sunny Evolution Pro II SF-B1986
Sunny Evolution Pro II SF-B1986

Product: Sunny Evolution Pro II SF-B1986

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

Warranty: Frame 3 years / Parts 180 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 the post. Full disclosure

Details and Specifications

  • Assembled dimensions: 49L x 24W x 50.5H inches (124L x 61W x 128H cm)
  • Assembled weight: 136 lbs (61.6 kg)
  • Flywheel weight: 40 lbs (18 kg)
  • Supported weight: 330 lbs (150 kg)
  • Handlebars: 4-way adjustable
  • Seat: 4-way adjustable
  • Drive: Belt
  • Resistance: Manual magnetic
  • Fitness Monitor: Time, speed, distance, cadence, watts, pulse, goals, race program
  • Extras: Bottle holder, dumbbell holder, the device holder
  • Warranty: Frame 3 years / Parts 180 days

SF-B1986 Frame Construction

The Sunny Health & Fitness Evolution Pro II features a heavy-duty steel frame to support any spin workout. In addition, it combines oval and rectangular bars in its construction for improved sturdiness and aesthetics.

Sunny Evolution Pro II SF-B1986

The frame’s main section comes double-coated with a corrosion-resistant and chip-resistant paint finish, except for the seat and handlebar posts; these are chrome plated. The bike also has a few plastic parts in its construction. For example, the drivetrain cover and the flywheel’s side panels are made of durable thermoplastic materials.

The fully assembled bike is quite heavy, similar to a commercial bike. Its net weight is approx—136 lbs (61.6 kg). Therefore, two people should transport and assemble the bike.

However, once assembled, one person can move the bike as its front stabilizer integrates two large silicone wheels. Also, both base stabilizers come equipped with large, adjustable levelers.

The Sunny Evolution Pro II SF-B1986 is not an extremely large fitness machine but more extensive than most spin bikes made for home use. It is approximately 49″ (124 cm) long and 24″ (61 cm) wide.

Plus, it has a low center of gravity, and its impressive weight provides superior stability. As a result, you can be sure it won’t rock or move even if you engage in a high-intensity spin workout.

The bike’s frame also has a step-up bar feature, a small bar that connects the seat tube with the main oblique tube of the frame. It can facilitate the mounting/dismounting for a shorter person, serve as stretch support, or step up and down from the structure as some spin workouts require. It also improves the overall sturdiness of the frame.


The Sunny Evolution Pro II SF-B1986 bike has a saddle designed for superior comfort. It is approx. 10.5″ (26.6) long and 7.75″ (19.6 cm) wide, so it provides plenty of contact surface. In addition, it integrates a thick layer of foam padding and has a longitudinal groove for improved breathability.

Another essential aspect to note about the seat is its attachment system. This saddle features a standard collar-type attachment system, so you can easily remove it or adjust its angle if necessary. It also means that you should be able to find a replacement in basically any bike shop if you ever need to replace it.

Sunny Evolution Pro II SF-B1986
Sunny Evolution Pro II SF-B1986

The seat is four-way adjustable (front, back, up, down). Its vertical post has nine adjustment positions and offers an adjustment span of approximately 10″ (25.4 cm). Its horizontal slider also offers approx—3″ (7.6 cm) of front-to-back adjustment.

Therefore, the applicable inseam length for this bike is 29″ – 39″ (73.6 – 99 cm). Thus, the bike should be able to accommodate users between 5’1″ and 6’6″ (155 – 198 cm). Its maximum user weight capacity is 330 lbs (150 kg).

SF-B1986 Handlebars

The Sunny Evolution Pro II SF-B1986 bike comes equipped with a multi-grip handlebar. It offers the possibility to adopt a climbing grip, an aero grip, a close grip, a standard grip, and a racing grip. In addition, a layer of high-density foam material fully covers it for an improved grip.

Its side grips integrate metallic HR pulse sensors, and the included fitness console has a pulse reading function. This feature is not available with the Evolution Pro model. In addition, the handlebar incorporates a tablet holder.

Like the seat, the bike’s handlebar is four-way adjustable (up, down, front, back). In addition, its vertical post offers five adjustment positions, while its front-to-back slider provides approx—two extra inches of horizontal adjustment.

Resistance system

The Sunny Evolution Pro II SF-B1986 indoor cycling bike has a manual magnetic resistance system. Therefore, you don’t need an adapter, power cord, or an external power source. However, on the other hand, the included fitness monitor cannot adjust the resistance automatically.

The bike’s resistance system consists of a magnetic brake attached to the frame’s main inclined bar above the flywheel. The brake connects to the tension knob on top of the frame. Therefore, by turning the knob clockwise, the magnets move closer to the flywheel, which increases the pedaling difficulty.

Sunny Evolution Pro II SF-B1986

The main advantage of a magnetic brake is that the resistance elements do not touch, so there is no friction, and the pedaling motion is very smooth and quiet.

The bike’s brake is stepless. It does not have any pre-determined tension levels. You turn it left or right until you get the pedaling difficulty to where you feel comfortable. For example, with the brake pad closest to the flywheel, the bike provides great difficulty, simulating a steep climb.

SF-B1986 Drive system

The Sunny Evolution Pro II SF-B1986 bike has a 40 lbs (18.1 kg) flywheel and a perimeter-weighted design. This flywheel construction improves inertia and leads to smooth and consistent pedaling motion. In addition, the flywheel is bi-directional; it allows pedaling in reverse.

However, coasting is not possible on this bike. That’s because the pedals continue to spin for as long as the flywheel is spinning.

Since it’s an indoor cycling bike designed for spin workouts, the Evolution Pro II SF-B1986 features a heavy-duty 3-piece crankset with solid steel arms and metallic alloy pedals. Thus, the crankset and pedals should support users up to 330 lbs (150 kg) with no problem.

The included pedals are dual-sided. They have adjustable toe cages on one side and SPD elements for spin shoes. They also have 9/16 standard threads, so compatible options are widely available if you need to replace them.

The bike comes equipped with a belt drive system. It uses a 5PK1590 poly-v belt resistant to stretching and abrasion. The main advantage of this belt drive is that you don’t ever have to lubricate it. Also, it delivers a vibration-free pedaling motion, contributing to the ride’s overall smoothness.

Sunny Evolution Pro II SF-B1986
Sunny Evolution Pro II SF-B1986

Fitness monitor

The Sunny SF-B1986 indoor cycling bike includes a mid-range fitness monitor. It is battery-powered and requires two AAA batteries, which come with the bike. However, it does not have online connectivity but does offer quite a few more features than the average bike fitness monitor.

First, its display divides into four sub-sections to simultaneously view up to four workout metrics. It shows speed, average speed, maximum speed, cadence (RPM), average cadence, maximum cadence, distance, calories, time, and pulse.

By default, the speed and distance are in Imperial units (mph and miles), but the fitness monitor displays metric units. The pulse reading function is grip contact only. Unfortunately, the monitor cannot communicate with a wireless heart rate chest strap.

The monitor offers time, distance, calories, and cadence target functions. Upon selecting a target for time, distance, or calories, the monitor counts down from the target until it reaches zero.

After choosing a cadence target, the monitor will prompt you to increase your pedaling rhythm if your cadence falls below the selected target and slow down if your tempo exceeds the RPM.

A Race Mode also is available. Using Race Mode, you can only select a target for distance and time. The cadence is variable. Therefore, you will have to beat the computer to the specified distance while keeping a higher tempo than it does.

SF-B1986 Assembly and Maintenance

The bike’s frame comes pre-assembled. So you only need to attach the two base stabilizers, the pedals, the seat tube, the saddle, the handlebar tube, the handlebar, the fitness monitor, the dumbbell holder, and the bottle holder.

Sunny Evolution Pro II SF-B1986

Consequently, the task is simple and shouldn’t take more than 30 minutes. All the tools for the assembly come included, and the manual provides precise assembly instructions.

For maintenance, you only have to clean the bike, wipe off the sweat from the frame at the workout’s end, periodically check for loose bolts and parts, and retighten if necessary. The belt and brake do not require lubrication.


  • Heavy-duty commercial-grade frame;
  • Superior weight limit – 330 lbs;
  • Professional-looking design;
  • Transport wheels on the front base;
  • Adjustable levelers on both base bars;
  • Four-way adjustable seat;
  • High-comfort cushioned saddle with a large groove in the middle for improved breathability;
  • Four-way adjustable, multi-grip handlebar;
  • Pulse sensors integrated into the handlebar;
  • Device holder integrated into the handlebar;
  • Smooth belt drive system;
  • Perimeter-weighted 40 lbs flywheel for improved momentum;

    Sunny Evolution Pro II SF-B1986
    Sunny Evolution Pro II SF-B1986
  • Frictionless magnetic resistance;
  • Dual-sided pedals (SPD clipless on one side, toe cage on the other);
  • Fitness monitor included;
  • Goal settings for time, distance, calories, and cadence;
  • Race program;
  • Dumbbell support included;
  • Bottle holder included;
  • Batteries for the fitness monitor come included with the bike;
  • Little maintenance is required;
  • Easy to assemble;
  • All the tools needed for the assembly come with the bike;
  • Excellent warranty.


  • No backlight on the fitness monitor LCD;
  • The fitness monitor does not have online connectivity.

Sunny Evolution Pro II SF-B1986 Summary

The Sunny Health & Fitness Evolution Pro II SF-B1986 is a heavy-duty indoor cycling bike supporting any spin workout. It has a magnetic resistance system, a 40-lbs flywheel, dual-sided pedals, a fitness monitor with target settings, and a race program.

In addition, it also offers superior micro-adjustability for the seat and handlebar and an impressive maximum user weight capacity of 330 lbs. Moreover, it’s an excellent bike for users of all levels for medium to high-intensity cardio workouts, interval training, muscle toning, stamina and strength development, and weight loss.

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

Please remember to 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.

12 thoughts on “Sunny Evolution Pro II SF-B1986 | Designed for Speed & Stability”

  1. I just bought myself a Schwinn stationary bike.  It is pretty snazzy, but I find it big and cumbersome.  I’m ready to change it out for something that rides better and takes up less room.   Something like this looks like what I need.  And I can put it in my bedroom, which is even better.

    • Hi Leahrae, thanks for stopping by and sharing. It sounds like you know what you want. Would you please let me know if I can ever be of assistance? I’m here to help.

      Kind regards, Robert

  2. I will consider using this site as my bookmark to check exercise machines like the Sunny Evolution Pro II SF-B1986. I wondered if your site can show the results of people using the bike for a selection of different people. Suppose you can I be very motivated to save my money to buy one. 

    • Hi John, thanks for stopping by. I believe you’re asking for comparisons of different bikes. At this time, I don’t have any; however, I may do some in the future. Would you please let me know if I can ever be of assistance? I’m glad to be of help.

      Kind regards Robert

  3. Part of biking is getting out into nature and seeing, feeling, and hearing the sounds of nature. I often wonder why manufacturers don’t design an exercise bicycle with a screen that would show images of riding through chosen courses of the world and stimulate the experience with sounds and the stresses of peddling the bike and navigating through the gears. However, if we must be indoors, the Sunny Pro II seems to be very well built, durable and quiet in operation. A fitness tracker is a valuable object for athletes who want to track their performance. It is good to know that even though heavy and sturdy, it is easy to move as it has large silicon wheels.  

    • Hi there, thanks for stopping by. You can stop wondering why manufacturers don’t design bikes with screens large enough to see chosen scenic courses in the world. NordicTrack, Bowflex, and others are providing these options. The choice now is what scenic route to take during your workout.

      Would you please let me know if I can assist you with the Sunny SF-B1986 bike or any other exercise equipment? I’m always happy to help.

      Kind regards, Robert

  4. Hi Robert, thanks for your review of the Sunny Evolution Pro II SF-B1986. A comfortable saddle will make or break my decision as to whether I buy an exercise bike. So knowing it has a comfortable saddle means much in my estimation. I like to spend lots of quality time on my exercise bike and see that it is a joy to ride.
    A quiet and stable ride also ranks high in what I am looking for in an exercise bike. I may wake early or be up late at night and like having the option of riding without disturbing others.
    A good warranty is also important to me, though I hope never to need to use it. It is helpful to have a reliable monitor for tracking your progress as you exercise. (On my last bike, the monitor gave out.)
    Thanks for such a thorough review. It makes it easier to choose a good quality bike for my next exercise bike.

    • Hi Carolyn, thanks for stopping by and sharing your thoughts with us. Would you please let me know if I can assist you with the Sunny SF-B1986 or any other exercise equipment? I’m always happy to help.

      Kind regards, Robert

  5. When purchasing an exercise bike, I always like to sit on the seat and see if it is comfortable, as there is nothing worse than an uncomfortable seat. This one looks comfortable as it is pretty comprehensive and has foam padding to soften it. I had a bike with a very narrow seat, and it was not fun to ride, so as you can guess, it became a white elephant until I finally sold it.

    I see that you can also replace the seat in any bike shop should you need to, which is a bonus.

    • Hi Michel, thanks for stopping by and sharing your thoughts with us. Would you please let me know if I may further assist you with exercise equipment? I’m always happy to help.

      Kind regards, Robert

  6. A robust monitor can track my speed (avg and max speed). And the ability to compare my target and actual distance covered makes it a far better option than my present indoor cycle, that only indicates the total distance covered. Not coming with online connectivity will not be an issue for me. I will take a look at sunny evolution

    • Hi there; thanks for stopping by and sharing your thoughts with us. Would you please let me know if I may further assist you with exercise equipment? I’m always happy to help.

      Kind regards, Robert


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