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

Synergy Pro Magnetic Indoor Cycling Bike


166 reviews

Regular price

List Price:

Sale price $674.99 Save $325.00
181 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 handle bar 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 lbs 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 at arm's length!  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, and pulse

40 lb flywheel

Pulse sensors

Micro adjustable resistance

Multi-grip Handles

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

UPC: 815749012432

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 166 Reviews
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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
Courtney G.
United States United States
Fantastic bike!

I have done spin classes for years. I decided to get my own bike for my home. I researched some popular, more expensive bikes and found some good reviews of the sunny bike. I was worried since it is so inexpensive compared to others. But I was SO impressed with this bike when it arrived! It was easy to assemble. It’s very sturdy and easy to use. I love having the option to clip in my bike shoes. It does show cadence but it doesn’t show me a number for my resistance. That’s my only complaint. But I can definitely deal with that for the price. I highly recommend this bike especially if you have had experience with other bikes. That way you can judge your resistance by feel. Overall, it’s a great bike for a great value!

Sunny Health and Fitness Synergy Pro Magnetic Indoor Cycling Bike Review
Sarah J.
I HIGHLY recommend!

For starters: I ONLY write reviews if I absolutely love a product. I purchased this bike to use with Peloton’s app to access their classes. It was packaged well, and easy to install and set up (once I watched numerous videos on how to properly fit yourself for an indoor cycle bike). It rides super smooth (I do have it on a workout mat), is comfortable to ride (I added a seat pad) and there is a perfect spot to place your phone or your Ipad to watch videos, or shows, or whatever your preference. If you are on the fence about it, or are a beginner like myself, then I can tell you from first hand experience this is without a doubt worth the money and investment into your health! I am really glad I didn't pay upwards of $1000 for a bike since this one is definitely sufficient and is fulfilling its purpose perfectly. I HIGHLY recommend!!

Tori S.
United States United States
Amazing & Great Price! $

Loving this bike! So wonderful for the money! You won’t regret this purchase. Also so easy to put together!