Sunny Pro II SF-B1964 Indoor Cycling Bike | Transform Your Body Fitness

Saddle up and ride silently and swiftly on the Sunny Pro II SF-B1964 Indoor Cycling Bike. Indoor exercise bikes with magnetic resistance provide a riding experience within the comfort of your own home. Transform your magnetic bike from an indoor cardio trainer to a total body fitness experience by incorporating dumbbells into your workout sessions.

The heavier the flywheel, the smoother the ride! Sunny’s flywheel is second to none when feeling like you are riding outdoors! No more jerky, out-of-control movements, regardless of speed or resistance level! The magnetic resistance brake is contactless with the flywheel resulting in a virtually maintenance-free experience with a smooth and quiet ride.

Stay on top of your riding metrics with the fitness monitor digital display. It tracks the Time, Speed, Distance, Calories, RPM, and Pulse. It also features an Odometer and a Scan function. Keep your heart rate high and consistent for an effective and efficient workout. Integrated hand grip pulse sensors allow a quick and convenient tracking of this vital fitness metric.

Sunny Pro II SF-B1964 Indoor Cycling Bike
Sunny Pro II SF-B1964 Indoor Cycling Bike

Learn more in my complete review below!

Product: Sunny Pro II SF-B1964 Indoor Cycling Bike

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: 48.8L x 20.1W x 49.2H inches (124L x 51W x 125H cm)
  • Assembled weight: 105.4 lbs (48 kg)
  • Flywheel weight: 40 lbs (18 kg)
  • Supported weight: 275 lbs (125 kg)
  • Seat: 4-way adjustable
  • Resistance: Manual magnetic
  • Drive: Belt
  • Fitness Monitor: Time, speed, distance, odometer, RPM, calories, and pulse
  • Extras: Bottle holder, device holder, dumbbell holder
  • Warranty: Frame 3 years, Parts 180 days

SF-B1964 Frame construction

Sunny Pro II SF-B1964 Indoor Cycling Bike

The Sunny Pro II SF-B1964 indoor cycling bike features a pretty standard triangular frame construction. Its rectangular steel tubing comes double-coated with a corrosion-resistant dark gray paint finish, while the seat and the handlebar posts are black.

Like most other spin bikes, the Sunny SF-B1964 is not a large fitness machine. However, with all the parts assembled, it is approx. 48.8″ (124 cm) long and 20.1″ (51 cm) wide, while its highest point, with the handlebar extended up, is 49.2″ (125 cm).

The bike is relatively heavy. Its net weight is 105.4 lbs (48 kg). Therefore, two people should carry and assemble the bike. However, one person can quickly move the bike once completed as its front base bar features two large transport wheels.

On the other hand, this impressive weight considerably improves the bike’s overall stability. It also has a low center of gravity, which adds to its stability. Plus, both base bars come equipped with adjustable stabilizers.

Last but not least, the bike has a step-up element: the short horizontal bar at the base of the seat tube. Not all spin bikes have this element, so it is quite a plus as it can help with mounting and dismounting and is a support point for stretching and other exercises.

Seat and handlebars

The Sunny Pro II SF-B1964 indoor cycling bike comes equipped with a four-way adjustable (up, down, front, back) seat. Its vertical post features several adjustment positions, while its horizontal slider adds a few extra inches of front-to-back adjustment.

Thus, the bike comfortably accommodates users between 5’0″ and 6’4″ (153 – 193 cm). In addition, it also has a maximum user weight limit of 275 lbs (125 kg) which is not bad for a home-use bike.

Sunny Pro II SF-B1964 Indoor Cycling Bike
Sunny Pro II SF-B1964 Indoor Cycling Bike

The included saddle provides superior comfort. It is a durable nylon shell with a thick layer of foam cushioning, and it has contours with a large cutout in the middle for improved breathability. Its attachment system is collar-based which allows for a bit of angle adjustment, and it also makes it easy to replace with compatible options widely available.

The Sunny SF-B1964 exercise bike comes equipped with a multi-grip handlebar. It offers the possibility of adopting a standard grip, a cruising grip, a climbing grip, and a close one. In addition, it also has a long loop bar in the middle for an aero grip and a close parallel grip.

The handlebar comes with a layer of PVC foam for an improved grip. Its side grips integrate HR pulse sensors, and the included fitness monitor has a pulse reading function. Unfortunately, it is only two-way adjustable (up, down); it does not have a horizontal slider like the seat for front-back adjustment.

SF-B1964 Drive system

The Sunny Pro II SF-B1964 indoor cycling bike comes equipped with a 40-pound (18 kg) flywheel, which is also perimeter-weighted to provide superior inertia and consistent momentum.

For instance, this type of flywheel construction is excellent for spin workouts and due to its weight, exercising on this bike improves your stamina and leg muscle strength.

The flywheel allows reverse pedaling, which will enable you to put some diversity into your workouts by alternating forward and backward pedaling. However, coasting on the bike is not possible.

The pedals continue to spin for as long as the flywheel is spinning. Also, when pedaling in reverse, you will get the same resistance as when pedaling forward, and the fitness monitor continues to keep track of your distance, speed, etc.

The bike comes with a belt drive system. It integrates a highly resistant to stretching poly-v belt, designed for improved traction. A belt drivetrain comes with two main advantages. One, you don’t have to lubricate it. And two, it generates slightly less vibration than a chain, so the pedaling motion is very smooth.

Sunny Pro II SF-B1964 Indoor Cycling Bike

The bike’s crankset features solid steel and oval arms, painted black. The pedals are aluminum alloy, durable, and will withstand any spin workout even if the user is close to the maximum weight limit (275 lbs).

Unfortunately, the pedals don’t have SPD clips for spin shoes, but they have toe cages. However, their threads are 9/16″, so compatible options are widely available if you need to replace them.

Resistance system

The Sunny Pro II SF-B1964 indoor cycling bike comes equipped with a manual magnetic resistance system. Therefore, you don’t need to connect it to a power source, and you don’t need a power adapter or power cord for it. However, the bike does not adjust the resistance automatically.

The bike’s resistance system consists of a magnetic brake attached under the main oblique tube of the bike and to the tension knob. Therefore, when you turn the knob clockwise, the magnetic brake pad moves closer to the flywheel, which increases the pedaling difficulty.

The main advantage of a magnetic brake is that the brake pad does not touch the flywheel. Thus, the pedaling motion is drag-free, seamless, and whisper-quiet.

The bike’s tension knob does not have pre-determined resistance levels. However, there is quite a wide range between the lowest and highest resistance. So there is a bit of difficulty even on the lowest difficulty setting as a general idea.

Conversely, when the magnets are close to the flywheel, the bike simulates a steep climb and will offer quite a challenge even to the most seasoned users.

In addition, the bike’s resistance system can act as an emergency brake. If you need, For example, if you stop the flywheel from spinning, you can press on the tension knob. The emergency braking feature is essential as controlling the flywheel from the pedals with your feet is not advisable and can lead to injuries.

Sunny Pro II SF-B1964 Indoor Cycling Bike
Sunny Pro II SF-B1964 Indoor Cycling Bike

SF-B1964 Fitness monitor

The Sunny Pro II SF-B1964 indoor cycling bike comes equipped with a simple fitness monitor. It features an LCD (without a backlight) that tracks time, distance, total distance, speed, calories burned, RPM, and pulse. Unfortunately, the speed and distance are in MPH and miles; there is no option for setting them to metric units.

The pulse reading function is grip contact only. Therefore, the monitor cannot read your pulse from a wireless transmitter; it can only read it if you hold on to the sensors integrated into the handlebar.

The monitor does not have pre-set programs, goal settings, or online connectivity. In addition, it has one button, which covers two functions.

By pressing it repeatedly, you can select the workout metric you want to view on display or select the scan mode, which automatically rotates all the metrics. You can also press and hold it for a few seconds to reset all the values to zero.

The fitness monitor is battery-powered, and it requires two AAA batteries that come with the bike. When you begin pedaling or press the button, it starts monitoring your workout data. In addition, it also automatically turns off if it does not detect any activity on the bike for more than four minutes.

Assembly and Maintenance

The mainframe of the Sunny SF-B1964 comes pre-assembled. The flywheel, the belt, the crankset, and the magnetic brake are pre-installed. You only have to attach the two base stabilizers, the pedals, the seat, the handlebars, and the fitness monitor.

Therefore, it shouldn’t take more than 40 minutes of your time. All the necessary assembly tools come with the bike, and the manual provides clear step-by-step assembly instructions.

Sunny Pro II SF-B1964 Indoor Cycling Bike
Sunny Pro II SF-B1964 Indoor Cycling Bike

For maintenance, you only have to keep the bike clean. The drivetrain does not require lubrication since it has a belt drive system. Also, since the brake is magnetic, it doesn’t require lubrication or replacement either. So, other than keeping the bike clean, you only have to check for loose bolts and parts and retighten them as needed.


  • Sturdy construction – can support users up to 275 lbs;
  • Small footprint;
  • Four-way adjustable seat;
  • Contoured saddle with a median cutout for improved breathability;
  • Multi-grip handlebar with aero grips;
  • Pulse sensors integrated into the side grips of the handlebar;
  • Solid crankset, can support just about any spin workout;
  • Metallic pedals with toe cages and standard threads;
  • Frictionless magnetic resistance for a smooth pedaling motion;
  • Smooth and quiet belt drive;
  • Fitness monitor included – it tracks time, distance, total distance, speed, RPM, pulse, and calories burned;
  • Little maintenance is required;
  • Device holder included;
  • Bottle holder included;
  • Dumbbell holder included;
  • Easy to assemble;
  • All the assembly tools included;
  • Excellent warranty.


  • The fitness monitor LCD doesn’t have a backlight;
  • No goal functions on the fitness monitor;
  • The fitness monitor doesn’t have online connectivity.

Sunny Pro II SF-B1964 Indoor Cycling Bike Summary

The Sunny Pro II SF-B1964 is an indoor cycling bike for home use. It comes equipped with a 40-pound flywheel, a manual magnetic resistance system, a heavy-duty crankset with caged metallic pedals, and a fitness monitor.

Moreover, it’s a pretty sturdy bike, rated for users up to 275 lbs. In addition, it’s excellent for spin workouts and great for high-intensity cardio training, intervals, muscle toning, stamina 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 note: Before starting any exercise program, you should consult your physician to determine if you have any medical or physical conditions that could put your health and safety at risk 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.

6 thoughts on “Sunny Pro II SF-B1964 Indoor Cycling Bike | Transform Your Body Fitness”

  1. I have enjoyed using a stationary bike for years. However, I have never used one with a magnetic flywheel.  You wrote about that feature adding stability.  What kind of flooring works best with the base of the bike?  I ask because my bike moves a bit when pedaled fast.  Thanks for the detailed review.

    • Hi Anastazja, thanks for stopping by and sharing your thoughts with us. The Sunny SF-B1964 features adjustable stabilizers on its base bars for leveling the bike. A level floor works best for stability. In addition, the weight and low center of gravity of the bike add to stability. 

      Would you please let me know if I can assist you further with the Sunny SF-B1964 or any other exercise equipment? I’m always happy to help.

      Kind regards, Robert

  2. I had been in the market for a stationary bike.  I got a Schwinn that I am not happy with and find myself not using.  The Sunny Pro II looks like more my style for about the same price I paid.  Now I need to get rid of this one I have.  I had good intentions, but since I don’t like the way it rides, it is time to sell and get something more workable like this Sunny Pro!

    • Hi Leahrae, thanks for stopping by and sharing your thoughts with us. Would you please let me know if I may further assist you with the Sunny Pro II SF-B1964 or any other exercise equipment? I’m always happy to help.

      Kind regards, Robert

  3. I have always enjoyed cycling both indoors and outdoors. That is because I find it very relaxing and helps with my energy. However, I have always had trouble finding the right bike for myself and my needs with exercise bikes. Will this help with my weight loss goals? Not all cycle bikes do that. In the end, this looks like a bike that fits my needs, and I would use it. So thanks again. 

    • Hi Kiersti, thanks for stopping by and sharing your thoughts with us. Yes, the Sunny SF-B1964 would help you to lose weight. How fast depends on how often and how long you use the bike and your diet.

      Would you please let me know if I may further assist you with the Sunny SF-B1964 or any other exercise equipment? I’m always happy to help.

      Kind regards, Robert


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