Sunny Evolution Pro Indoor Cycling Bike | Massive 44 lb. Flywheel

The Sunny Evolution Pro Indoor Cycling Bike SF-B1714 is a highly rated magnetic exercise bike. An indoor cycle gives you the same feel as cycling on the road with a bicycle. In addition, the Sunny SF-B1714 provides an excellent cardiovascular workout with a low impact on your joints.

This bike’s three essential features are magnetic resistance, a heavy flywheel, and a belt drive for a smooth, silent ride. The heavier weight of the Sunny SF-B1714 makes it more stable than cheaper exercise bikes. In addition, it has a massive 44 lb — flywheel, which creates a secure, quiet, vibration-free workout.

The Sunny Evolution Pro Indoor Cycling Bike SF-B1714 saddle and handlebars are fully adjustable for a custom fit, i.e., up/down and forward/backward. In addition, the SF-B1714 spin bike adjustability makes it suitable for riders of different heights, with an inseam range from 30.1″ up to 38.3″.

Although it doesn’t come with a fitness console, it is fair to say that Sunny Evolution Pro is another top-quality indoor cycling bike for home users. This particular model looks stylish and has a solid steel frame, and more importantly, it delivers a smooth, challenging, and responsive workout with minimal noise.

Learn more in our complete review below!

Sunny Evolution Pro Indoor Cycling Bike SF-B1714
Sunny Evolution Pro Indoor Cycling Bike SF-B1714

Product: Sunny Evolution Pro Indoor Cycling Bike SF-B1714

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

Warranty: Frame 3 years / Parts 90 days

My rating: 8.75/10

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: 48.5″L x 24″W x 53.5H (123L x 61W x 136H cm)
  • Assembled weight: 136 lbs (61.6 kg)
  • Flywheel weight: 44 lbs (20 kg)
  • Supported weight: 330 lbs (150 kg)
  • Handlebars: 4-way adjustable
  • Seat: 4-way adjustable
  • Drive mechanism: Belt
  • Resistance: Manual magnetic
  • Fitness console: Not included
  • Extras: Bottle holder
  • Warranty: Frame 3 years / Parts 90 days

SF-B1714 Frame Construction

The Sunny Evolution Pro Indoor Cycling Bike SF-B1714 features heavy-duty steel construction with 330 lbs (150 kg) weight capacity. The bike is considerably heavy; it weighs approximately 136 pounds (61.6 kg), with the frame completely assembled. The bike’s base bars come with large, adjustable stabilizers. Therefore, you can perfectly level the trainer on any flooring. Unfortunately, the frame is not foldable. However, despite its weight, it is easy to transport once assembled. The front base has two large silicone wheels, facilitating the unit’s relocation.

This Sunny exercise bike isn’t giant. With the frame fully assembled, it is approximately 48.5″ (123 cm) long and 24″ (61 cm) wide. However, leaving at least two feet of clearance all around it is advisable so you can perform any spin workout without hindrance.

Although most of the bike’s frame is ovalized steel tubing, several plastic parts still exist. These are the covers of the belt, the flywheel, and the caps of the adjustment knobs. But apparently, these don’t affect the bike’s overall sturdiness.

The bike’s frame features corrosion-resistant and scratch-resistant paint. The color used is black for most of the structure. However, the seat post and the handlebar post have a chrome finish. Despite the paint’s rust resistance, this Sunny Health & Fitness exercise bike is for indoor use only. If kept or repeatedly used outside, the screws and other parts may eventually catch rust.

Sunny Evolution Pro Indoor Cycling Bike SF-B1714

Seat and handlebars

The seat included with the Sunny Health & Fitness SF-B1714 is entirely different than the slim seat present in most spin bikes. It’s thicker, integrates a consistent plush layer, and has a longitudinal groove to promote healthy blood flow. Consequently, this seat delivers much more comfort than a minimalistic spin bike seat.

On the other hand, the seat has a standard connection system to its post. So, if you want a different one, you should be able to find a compatible model in just about any bike shop.

The bike’s seat offers 4-way adjustability. Its height extends an adjustment span of approx. 8″ (20.5 cm), its horizontal slider can also travel a few inches back and forth.

The handlebar assembly is also 4-way adjustable. It’s for multiple grips with a unified aero bar in the middle. It’s urethane-dipped, so it provides a secure and comfortable grip.

Thus, the Sunny SF-B1714 can comfortably accommodate users between 5’0″ – 6’5″ (153 – 196 cm) with no problem. In addition, the adjustment knobs are relatively large and easy to grip, pull, and turn. Therefore, if several persons use the bike, re-adjustment shouldn’t take more than 1 minute.

SF-B1714 Drive system and elements

The most crucial component of the bike’s drive system is the flywheel. The Sunny Evolution Pro Indoor Cycling Bike features an extra heavy wheel, weighing 44 lbs (20 kg). This flywheel has a slightly different construction than other Sunny bikes.

It’s still perimeter weighted, though, designed for aggressive inertia. It delivers consistent momentum. Thus, the bike may not be the right choice for users with knee problems or other related disabilities.

Sunny Evolution Pro Indoor Cycling Bike SF-B1714
Sunny Evolution Pro Indoor Cycling Bike SF-B1714

The flywheel is bi-directional, so you can pedal in reverse if you want. However, unlike road bikes, or other types of trainers with a more sophisticated drive system, you cannot coast on this bike. The pedals continue to move for as long as the flywheel is spinning.

The crankset is also an essential element in constructing a spin bike. This Sunny exercise bike features a durable crankset with solid steel crank arms. It can hold the user’s entire weight if they don’t exceed the specified maximum weight capacity (330 lbs).

The included pedals are also very durable, made of metallic alloy. They come with toe cages and adjustable straps but do not integrate clips for SPD shoes. They’re replaceable, though; they feature standard 9/16 threads, so you should easily find compatible SPD models.

One last aspect is the bike’s Q-Factor (spacing between the pedals). The Sunny SF-B1714 features a narrow 122 mm Q-Factor. Moreover, this is quite a plus because your feet position naturally on the pedals. Thus, you won’t experience extra lateral stress on the knees or ankles.

Resistance system

One of the reasons the Sunny Evolution Pro Indoor Cycling Bike is a bit more expensive than other models is its magnetic resistance system. Its brake consists of a magnetic pad attached to the turn knob on the central tube of the frame.

When turning this knob, the magnetic element changes its position about the metallic flywheel, increasing or decreasing tension.

The brake adjusts manually by turning the knob left or right. You don’t have to connect the bike to a power circuit.

Like most upright bikes with magnetic resistance, the resistance knob doesn’t specify any levels or “clicks.” Instead, you turn the knob until you feel the strength generated corresponds to your training requirements.

Sunny Evolution Pro Indoor Cycling Bike SF-B1714

Since it’s a magnetic brake, its pad doesn’t touch the flywheel, so you won’t have to worry about wear and tear. Also, since there’s no friction on a higher resistance setting, the pedaling motion is much smoother than for a bike with a felt pad brake.

SF-B1714 Assembly and Maintenance

Like most exercise bikes, this Sunny model comes partially assembled. The flywheel, the belt, the crankset, and the brake are already in their places. Next, you must 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 precise instructions.

The bike is maintenance-free. Its drive system doesn’t require lubrication; its brake pad doesn’t need replacement since it has a magnetic tension system. So, for maintenance, you’ll need to wipe the sweat from the frame, periodically look for loose or damaged parts, and retighten or replace them.


  • Heavy-duty construction similar to commercial-grade bikes;
  • Large, adjustable stabilizers on both bases;
  • Transport wheels;
  • Can support users up to 330 lbs;
  • Step-up bar element for easy mount/dismount or various spin workouts;
  • Can accommodate users between 5’0″ – 6’5″;
  • Extra-heavy, perimeter-weighted flywheel for aggressive inertia and consistent momentum;

    Sunny Evolution Pro Indoor Cycling Bike SF-B1714
    Sunny Evolution Pro Indoor Cycling Bike SF-B1714
  • A solid crank assembly that can support all kinds of spin workouts;
  • Heavy-duty metallic pedals with toe cages;
  • Narrow Q-Factor (122 mm) to minimize lateral stress on the knees;
  • 4-way adjustable seat;
  • 4-way adjustable handlebar;
  • Multi-grip, urethane-dipped handlebar;
  • Smooth, almost silent belt drive;
  • Magnetic resistance system with virtually zero wear-and-tear;
  • The bottle holder included;
  • Almost no maintenance is required;
  • Easy to assemble.


  • No fitness monitor.

Sunny Evolution Pro Indoor Cycling Bike SF-B1714 Summary

The Sunny Health & Fitness Evolution Pro SF-B1714 is an indoor cycling trainer featuring an extra-heavy flywheel, manual-magnetic resistance, and heavy-duty construction. It offers superior micro-adjustability (both handlebars and seats are 4-way adjustable). In addition, it’s equipped with a plush seat and has a narrow (122 mm) Q-Factor.

Moreover, it’s a perfect exercise bike for medium to intense cardio training, interval training, strength and stamina development, and weight loss. Regarding price, it’s not exactly one of the most affordable trainers. However, it still costs a few $100s less than similar bikes. So, in conclusion, this Sunny exercise bike offers excellent value for the price.

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 that you should 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.

1 thought on “Sunny Evolution Pro Indoor Cycling Bike | Massive 44 lb. Flywheel”

  1. Altogether, it sounds like a great spin bike. It seems like it’s very sturdy, and I like the fact that you can increase the resistance to make things more challenging. Also, the fact that’s it’s quiet means you can use it any time of day or night without bothering anyone.


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