Sunny Synergy (SF-B1879) Review 

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Are you looking to purchase an exercise bike for your home fitness gym? The Sunny Synergy is a premium quality exercise bike manufactured by Sunny Health and Fitness, a world-renowned bike company.

The Sunny Synergy is priced at the higher end of Sunny’s range and comes equipped with all the latest features. In this comprehensive review, we’ll take a look at the Sunny Synergy and compare it to its more expensive counterpart, the Sunny SF-B1851 Synergy Pro Magnetic Indoor Cycling Bike.

So if you’re in the market for an incredible exercise bike but are not sure where to spend your hard-earned cash, then keep reading because I’ve done all the research and homework, so you don’t have to.

Synergy SF-B1879: What I liked & What Could Be Better

Are you looking to jumpstart your health and fitness journey? Then the SF-B1879 Synergy Magnetic Indoor Cycling Bike is for you. Designed and targeted toward the slightly more experienced rider, the Sunny Synergy offers many of the same bells and whistles as the Pro without the costly price tag.

Exercise bikes are the perfect way to improve your strength and cardio fitness and increase muscle mass in your legs, arms, and even abs. Indoor cycling is a low-impact exercise, meaning you can work out every day, which helps boost your overall health and fitness levels.

The SF-B1879 Synergy Magnetic Indoor Cycling Bike comes with a patented flywheel design that has been manufactured to produce a smooth and, more importantly, silent riding experience. When you couple the flywheel technology with the magnetic resistance and the belt drive system, the Synergy is simply a fantastic bike at an affordable price.

Can you think of a better way to boost your fitness than by working out in the comfort of your own home? There is no need to travel to the gym and pay the costly membership fees; simply work out anytime you like, and the best thing is the whole family can join in the fun.

Things I liked:

  • Patented flywheel technology
  • Magnetic Resistance System 
  • Smooth and quiet riding experience
  • Fully adjustable seat and handlebars
  • Easy to read performance monitor
  • Pulse sensors to track heart rate
  • Dumbbell holder rack 

Things To Consider:

  • Although the monitor is easy to read its not backlit 
  • The price may put some potential users off 

Sunny Synergy (SF-B1879) vs Synergy Pro (SF-B1851) 

If you’re just looking purely at design, then both bikes are almost identical, but when you start to dig a little deeper, it’s clear to see there are a few differences in terms of features.

The SF-B1879 Synergy Magnetic Indoor Cycling Bike is smooth, quiet, and a delight to use at home because of its silky-smooth ride quality, and the silence is bliss. On the other hand, you have the SF-B1851 Synergy Pro Magnetic Indoor Cycling Bike, which is the more expensive of the two bikes.

The SF-B1851 Synergy Pro has magnetic resistance technology, a device holder, and an upgraded digital monitor that tracks ride data such as time, speed, distance, and calories burned. Sunny Health and Fitness also give you the option to buy the Sunny Cadence Sensor which will accurately calculate and track your ride metrics with the SunnyFit App for the best cycling experience. This is an option I highly recommend because it transforms your regular bike into a smart training machine for a fraction of the cost.

With nearly a $200,00 price difference between the Synergy Pro Magnetic Indoor Cycling Bike is what most people would consider the better bike but is that really the case? To be honest it does have some better features but the Sunny Synergy is still an awesome bike for the price. If you’re an experienced rider but are on a limited budget then the Sunny Synergy is probably the perfect exercise bike for you.

Unlike many other well-known brands like Schwinn and Peloton, the Sunny Synergy offers similar ride quality and features and costs thousands of dollars less. 

Bike Weight88.2 lbs111.3 lbs
ResistanceMagnetic Magnetic
Flywheel30 lbs40lbs
User Weight Capacity275 lbs 300 lbs
PedalsCaged Caged and Clip-in
Device HolderYesYes
HandlebarsErgonomic non-slipHeavy-Duty Multi-Grip
Water Bottle HolderYesYes

Synergy SF-B1879 Detailed Review


  • Price $459,99
  • Weight: 88.2 lbs
  • Resistance: Magnetic
  • Max User Weight: 275 lbs
  • Pedals: Caged
  • Console: Yes 
  • Device Holder: Yes
  • Water Bottle Holder: Yes

Construction Quality

The SF-B1879 Synergy Magnetic Indoor Cycling Bike is a durable and well-manufactured bike that, for the price, is actually quite surprising. The bike itself is heavy, which is exactly what you want in an indoor stationary exercise bike. The flywheel is robust, and to be honest, it’s the most important component on any exercise bike. Weighing in at 30lbs, the heavy flywheel helps to make the bike balanced and stable while you’re pushing hard on the pedals.


The magnetic resistance system on the SF-B1879 Synergy Magnetic Indoor Cycling Bike is simply one of the smoothest and quietest ever had the pleasure of riding. There are no noisy and annoying sounds because the magnetic system never touches the wheel, unlike felt pad resistance systems which can get very noisy and need replacing every 12 to 24 months.

The magnetic system makes changing and finding your best resistance levels very easy and simple. The twist knob is at arms reach and sits in the downtube, so you can change resistance up and down while working out. 

Drive System & Flywheel

As mentioned earlier, the SF-B1879 Synergy Magnetic Indoor Cycling Bike is lucky enough to have a patented flywheel that is designed to increase momentum and improve the overall riding quality. Unlike road bikes, where the lighter the bike and frame, the better, that is not the case with an exercise bike; this is why the design team at Sunny Health and Fitness gave the Synergy a 30lb flywheel. 

The heavier the flywheel, the quieter and smoother the riding experience. For example, the SF-B1851 Synergy Pro Magnetic Indoor Cycling Bike has an even heavier flywheel than the Synergy weighing in at a whopping 40lbs; this takes the Pro model to an entirely new level.


The handlebars on the SF-B1879 Synergy Magnetic Indoor Cycling Bike are designed to support riders with everything from sprinting out of the saddle or laying down thre power on an epic climb. The grips are adjustable in two ways which makes it very easy for users of any height to find their perfect riding positions.

The handlebars also have pulse sensors to help track your heart rate, which is a nice feature to have on a bike of this price. The seat on the SF-B1879 Synergy Magnetic Indoor Cycling Bike is absolutely fantastic, and as someone who has ridden bikes my entire life, this seat is simply the best I’ve seen on an exercise bike.

The seat is 4-way adjustable and has a specifically designed longitudinal groove to help relieve pressure from the pelvis area. The seat can be adjusted up and down and forward and back, which again means most people of any body height and shape can find a comfortable riding position. 


The monitor on the SF-B1879 Synergy Magnetic Indoor Cycling Bike is not the best; there, I said it. Now, although the Synergy bike from Sunny Health and Fitness is super high-quality, the console really leaves a lot to be desired. The screen is small and makes it very difficult to see while working out hard. 

That being said, the monitor does give you some pretty relevant data like speed, distance, time, cadence, pulse, and calories burned. The SF-B1851 Synergy Pro Magnetic Indoor Cycling Bike has an upgraded monitor which tracks much more such as time, speed, cadence, distance, pulse, race mode, target times, and the ability to switch between modes. 


The pedals on the SF-B1879 Synergy Magnetic Indoor Cycling Bike are caged and perfect for beginners. More experienced riders may be better off buying the SF-B1851 Synergy Pro Magnetic Indoor Cycling Bike because they are dual-purpose, meaning you can use sneakers or turn them over and clip in your SPD cycling shoes. 


The Synergy is a heavy bike which, as I stated earlier, is a good thing, but it’s not so good when it comes to transporting the bike around. But wait, the design team at Sunny Health and Fitness has thought of everything, and they’ve added two little transport wheels to the bottom of the bike; this means that it’s easy for people, especially more petite women, to move around the house with ease. 


Assembling any piece of fitness equipment can be a real pain in the backside, but I’ve got some good news; the SF-B1879 Synergy Magnetic Indoor Cycling Bike comes pretty much fully assembled. 

Now luckily, you only really need to put together the handlebars and a few other small components, but the instructions are clear and easy to read and shouldn’t take any longer than 30 minutes to assemble. 


Sunny Health and Fitness offer one of the best warranties I’ve ever come across, with a 3-year structural frame and 180 days of other parts and components. This warranty and promise from the brand really provide customers with the confidence to ride hard. 

Comparison with Other Alternatives

Now when it comes to the range of bikes that Sunny Health and Fitness has to offer, it can be confusing and even daunting when selecting the perfect bike for you. So take a look at these comparison tables and then read about the main differences between each of the models manufactured by Sunny.

ResistanceMagnetic MagneticFelt Pad Felt Pad 
Device holderYesYesNoNo
User Weight275lbs 300 lbs275 lbs275 lbs
Bike Weight88 lbs125 lbs102 lbs110 lbs
Flywheel 30 lbs44 lbs40 lbs49 lbs
Water Bottle YesYesYesYes

Synergy SF-B1879 vs SF-B1805

The SF-B1805 Magnetic Indoor Cycling Bike has an incredibly heavy 44lb flywheel which makes the riding experience much smoother than its cheaper counterpart the  SF-B1879 Synergy Magnetic Indoor Cycling Bike. Both bikes have device holders, magnetic resistance, and transportation wheels. I also love the fact that by simply purchasing the Sunny Cadence Sensor you can turn your bike into a high-tech one for very little add-on cost.

Synergy SF-B1879 vs SF-B901

The Sunny Health & Fitness SF-B901 Pro Indoor Cycling Bike is chain-driven and has a felt pad resistance system which is entirely different tot the Synergy which has a patented state-of-the-art magnetic resistance system. Both bikes have caged pedals, transportation wheels, and levelers on the bottom of the bike

The flywheel on the Sunny Health & Fitness SF-B901 Pro Indoor Cycling Bike weighs 40lbs compared to the Synergy which weighs 30lbs, If you are looking for a smoother and quieter ride the SF=B901 is probably going to be the better choice for you. 

Synergy SF-B1879 vs SF-B1002

The Sunny Health & Fitness SF-B1002 has the heaviest flywheel in the Sunny Health and Fitness range weighing a whopping 49lbs; what does this mean for the rider? Simply put, the heavier the flywheel the more realistic, quiet and smooth your riding experience is; riding the SF-B1002 is so realistic it felt like I was riding my own Trek Emionda road bike.

The best thing about the SF-B1002 is the 4-way adjustable seat and handlebars which means that every member of your family young or old small or big can find their best riding positions. Many bikes have very little adjustability but nearly every bike in the Sunny range has either two or four-way adjustment settings.


Sunny Synergy SF-B1879 review

When it’s all said and done, the SF-B1879 Synergy Magnetic Indoor Cycling Bike is probably one of the best bikes we reviewed in its specific price range. At just under $460,00, the bike offers value for money and provides the user with plenty of high-quality features that you’d typically expect to see on more expensive models.

There aren’t many bikes in this price range where you get patented flywheel technology, pulse sensors, caged pedals, adjustable handlebars, and an upgraded digital console.

No. it hasn’t got all the bells and whistles of some of the more expensive bikes in the Sunny Health and Fitness range, but that being said, if the riding experience is essential to you, the Synergy is well worth the money.

Brenton Barker

Brenton holds a Degree in Sports Coaching from the University of Delaware and was the former Head Advisor for the Japanese Government's Sports Science Institute. Brenton currently consults with several Professional Athletes and clients in Self- Accountability, Health, and Goal Orientation.

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