Synergy Pro Magnetic Indoor Cycling Bike

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Synergy Pro Magnetic Indoor Cycling Bike
Synergy Pro Magnetic Indoor Cycling Bike
Synergy Pro Magnetic Indoor Cycling Bike
Synergy Pro Magnetic Indoor Cycling Bike
Synergy Pro Magnetic Indoor Cycling Bike
Synergy Pro Magnetic Indoor Cycling Bike
Synergy Pro Magnetic Indoor Cycling Bike
Synergy Pro Magnetic Indoor Cycling Bike
Synergy Pro Magnetic Indoor Cycling Bike
Synergy Pro Magnetic Indoor Cycling Bike
Synergy Pro Magnetic Indoor Cycling Bike
Synergy Pro Magnetic Indoor Cycling Bike
Synergy Pro Magnetic Indoor Cycling Bike
Synergy Pro Magnetic Indoor Cycling Bike

Synergy Pro Magnetic Indoor Cycling Bike


286 reviews

Regular price

List Price:

Sale price $674.99 Save $325.00

1978 in stock

flywheel icon

Performance Monitor

Monitor icon

40 lb Flywheel

sturdy frame icon

300 lb Weight Capacity

magnet icon

Caged/SPD Compatible Pedals


Start a new in-home fitness routine with the SF-B1851 Synergy Pro Magnetic Indoor Cycling Bike. The Synergy Pro bike is one of the most advanced Sunny indoor exercise bikes. The innovative patented flywheel adds additional momentum to the ride. It works in sync with its advanced magnetic resistance system and makes riding extra smooth, solid and quiet. Ergonomically designed, this bike has a rounded multi-grip handlebar and 4-way adjustable seat that can help maintain your comfort and stability while you exercise. Cycling on an indoor bike is a low-impact exercise that can strengthen your cardiovascular performance and engage muscles in your arms, core, and legs.



Monitor your workout efficiency when you track your average and max speed and cadence on the built-in performance monitor. Use the speed and cadence data to assess and analyze your general fitness progress or cycling performance.



Improve your fitness experience by securely placing your phone or tablet in the tablet holder. Utilize this added accessory and follow along to fitness videos, or listen to your workout playlist.


4-Way Adjustable Seat

The seat of the bike is built for comfort and is fully adjustable. You can adjust the seat up-down or front-back, depending on your height and comfort. It integrates a consistent layer of support and also has a longitudinal groove to promote a healthy blood flow.


2-Way Adjustable Handlebars

The handlebar is 2-way adjustable, and will adjust to any rider's body and workout.  It’s designed for multiple grips with a unified aero bar in the middle. It’s urethane-dipped, so it provides a secure and comfortable grip.


Heavy Duty Steel Frame

With an incredible 300 lb user weight capacity, feel confident on this indoor bike that will support your body. The heavy duty, steel frame is built for the toughest and the strongest fitness riders.


Emergency Stop Brake

Your workout can be brought to an immediate stop with the convenient emergency brake button. This bike has a bigger and wider fly wheel, plus the magnets are on the top-front of the flywheel, which make it easy to stop. 



Lock in and feel the momentum of your machine with foot cage pedals. Use the optional SPD pedals with compatible shoes to clip and attach your feet to the pedals or the built-in toe cages for ultimate stability. Avoid foot slippage at increased levels of speed and intensity.


Pulse Sensors

Monitor and maintain your target heart rate. Measuring your pulse rate is an important tool for exercising correctly and efficiently. The steadier and prolonged your elevated heart rate is during the workout, the more fat is burned. This important piece of health metric will help you better understand your health and fitness status.


Bottle Holder

The convenient bottle holder keeps your favorite refreshing beverage within arm's reach!  Proper hydration will ensure your health and workout performance stay at optimum levels!


Dumbbell Holder

Use this cycling exercise bike in tandem with dumbbells (not included) to engage muscles in your upper body and core while you cycle. You can store them onto the built-in dumbbell holders when they are not in use (up to 20lb).


Transportation wheels

Simply tilt and roll out for use or away for storage, no need for heavy lifting or muscle strain. The wheels at the front of the unit allow the user to move their equipment around with ease, from room to room, or store it away out of sight.


Floor Stabilizers

If there is any wobble or instability with this indoor exercise bike, you can simply adjust one of the floor levelers to ensure that it is completely level. 


“Unlike other stationary bikes, indoor cycle bikes include reinforced pedals which allows the user to stand up while biking.  Standing while cycling is a proven technique that encourages weight loss. In addition, they are also much more solidly constructed when compared to most stationary bikes and will not wobble even when pedaling vigorously.”



Performance monitor: speed, avg speed, max speed, cadence, avg cadence, max cadence, distance (miles or kilometers), target distance, calorie, race, time, target time, pulse

40 lb flywheel

Pulse sensors

Micro adjustable resistance

Multi-grip handlebar

Device holder

Floor stabilizers



Cushioned seat

Seat dimensions: 10.5L x 7W x 1.5H in

4-way adjustable seat

2-way adjustable handlebars

Bottle holder

Dumbbell holders

Caged/SPD compatible pedals

Transportation wheels


300 lb weight capacity

Magnetic tension system

Belt drive

Adjustable inseam: Min 29 in / Max 39.5 in

Handlebar to seat distance: Min 15.5 in / Max 19.5 in

Emergency brake system



Warranty: 3 year structural frame 180 days other parts and components

Product weight: 111.3 lb

Product dimensions: 49L x 22W x 46.5H

Ship weight: 125.9 lb

Ship dimensions: 41.5L x 10W x 34.6H


Warning iconCancer and Reproductive Harm -

  Warning iconCancer and Reproductive Harm -


The Product Manual may be downloaded below. If you have any questions, please feel free to contact our customer care team.

The innovative patented flywheel works in sync with its advanced magnetic resistance system and makes riding extra smooth, solid and quiet.

Yes! We have a great library of workouts that you can perform on your indoor cycle, which can be found on the Workouts section of our website as well as on our YouTube channel.

Yes! The Synergy Pro Magnetic Indoor Cycling Bike comes with dumbbell holders so that your dumbbells (not included) are readily available for upper body & core exercise in tandem with your cycling workout.

The performance monitor helps track speed, cadence (RPM), distance (mph/km), calories, time, pulse, race.

Feel confident sitting on our durable design with a 300LB max user weight limit.

The durable belt drive provides smoother and silent pedaling and requires less maintenance.

Like most exercise bikes, this Sunny Synergy Pro comes partially assembled. The flywheel, the belt, the crank set, and the brake are already in their place. All you have to do is attach the front and rear base bars, the seat post, the handlebar post, the saddle, the handlebar, and the pedals.

The task shouldn’t take more than 30 min. All the tools you will need for the assembly come with the box, while the included manual provides clear assembly instructions.

Yes! This bike has caged & SPD-compatible pedals with a clip so that you can use cycling shoes with cleats to connect directly into the pedals as you ride.

Magnetic resistance uses magnets to add resistance which allows for smooth and quiet riding experience. Since it’s a magnetic brake and its pad doesn’t touch the flywheel, you won’t have to worry about wear and tear, replacement, or any friction-generated noise.

There is a 3-year warranty on the structural frame and 180-day warranty on other parts and components.

Customer Reviews

Customer Reviews
4.7 Based on 286 Reviews
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A Sunny Health and Fitness Customer
Renee P.
United States United States
Great bike!

Solid, stable bike that can keep up with rides from 10 minutes to 60+ with varying speeds and resistance. It’s quiet and smooth. It’s easy to adjust which is important for me and my husband as our settings are different. I LOVE that the pedals have cages on one side and SPD clips on the other. Perfect because I clip in and my husband and son do not. Overall extremely satisfied with our bike!

Sunny Health and Fitness Synergy Pro Magnetic Indoor Cycling Bike Review
Kelly K.
United States United States
Excellent purchase

Excellent bike. Well made. Quiet. All I ever wanted!

Sunny Health and Fitness Synergy Pro Magnetic Indoor Cycling Bike ReviewSunny Health and Fitness Synergy Pro Magnetic Indoor Cycling Bike Review
Sandy .
United States United States
High Quality without Needless Markup

I have recently purchased the Sony synergy pro magnetic spin bike. If, like me, you were looking for a work out to help you get through a long winter indoors, and you’d like to get good quality products without paying the brand markup I highly recommend this bike. Well I am sure there are good bikes out there that have a built-in monitor, I honestly don’t think you need it. Based on the research I did with other bikes on the market as well, it seems like the lower tier bikes that add a monitor tend to lack good quality on the bike itself and often required repairs. It also really bugged me that with those NordicTrack and Peloton, if you stop paying the monthly membership fee which is expensive, the monitor itself stops working. I just don’t think that’s a great level of customer service given how much you have to pay to get the bike in the first place. But anyways, back to this bike. I am really impressed with how easy the bike was to assemble, especially if use the video that I will include in the link below. It’s not the exact model of this one is, but it’s pretty close and helps you a lot. I haven’t struggled with basic assembly instructions, but this video combined with the owners manual was actually not bad at all. Even my husband was impressed! The bike is very quiet when you use it, and it’s easy to move around once you get it assembled because the wheels. I feel like I paid a fair price for the quality I got in the bike, and I can use one of the many devices I have in my house already to watch videos online or from other providers. Great quality in a fraction of the cost of Peloton.

Kathryn W.
United States United States
Very solid and quiet spin bike

Although I have only used the bike once, it felt very solid and smooth and quiet. I love the material that the handlebars are made out of because your hands don’t slip when they are sweaty. The bike arrives in one box very well packaged, but also very heavy. My husband and I unloaded the box on our driveway and brought the pieces in one by one. It was relatively simple to assemble and all the tools are provided to you.

Sunny Health and Fitness Synergy Pro Magnetic Indoor Cycling Bike Review
Karen K.
United States United States
Love this spin bike

This is the simple solution for getting a spin workout at home! I have tried 2 Sunny Fitness Spin workouts and they were great and very challenging. No subscription!

Sunny Health and Fitness Synergy Pro Magnetic Indoor Cycling Bike Review
Patricia M.
United States United States
Strong and sturdy

I have had a great experience so far. Has many features, such as magnetic resistance, great handle bar, a console to keep track of the ride, it definitely study and generally comfortable. Except for couple issues, one is the bottom has a black cover that covers the metal and it is loose is about to fall off.  Another thing is the seat is a little squeaky but I think those two are easy fixes. Overall it’s a sturdy bike and it has all the the features I need. I am happy with my bike!!

Sunny Health and Fitness Synergy Pro Magnetic Indoor Cycling Bike Review