Sunny SF-B1509 Indoor Cycling Bike | Great Way to Stay in Shape

Burn off those unwanted inches in time for swimsuit season with the Sunny SF-B1509 Indoor Cycling Bike. This bike offers all of the necessities for an intense yet enjoyable workout in the comfort of your own home. The quality of its heavy-duty steel crank and frame is built to withstand time and go the distance with users of all sizes and levels.

A chain drive and 40-pound (18.1 kg) flywheel provide smooth, quiet operation, while micro-adjustable resistance lets you increase your workout intensity as needed. Equipped with a quiet and smooth leather brake pad system, the resistance allows for various tension levels, enabling you to burn more calories.

Ensure your feet are firmly in place with dual-sided clip-in pedals or foot cage features. The dual-sided pedals are compatible with cycling shoes and accommodate high-performance clipless cleats and traditional fitness shoes. In all, it’s an indoor cycling trainer designed for spin workouts, perfect for in-home daily cardio training.

Sunny SF-B1509 Indoor Cycling Bike
Sunny SF-B1509 Indoor Cycling Bike

Learn more in my complete review below!

Product: Sunny SF-B1509 Indoor Cycling Bike

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

Warranty: Frame 3 years / Parts and Components 180 days

My rating: is 8/10

Affiliate Disclosure: As a Sunny Health Fitness Affiliate Program participant, I earn commissions on purchases made through links in this post. Full disclosure

Details and Specifications

  • Assembled dimensions: 49L x 20W x 47H inches (124L x 51W x 119H cm)
  • Assembled weight: 105 lbs (47.6 kg)
  • Flywheel weight: 40 lbs (18.1 kg)
  • Supported weight: 300 lbs (136 kg)
  • Handlebars: 2-way adjustable
  • Seat: 4-way adjustable
  • Pedals: Dual-action, SPD, and toe cages
  • Drive mechanism: Belt
  • Resistance: Friction, leather-pad
  • Bottle holder: Included
  • Warranty: Frame 3 years / Parts and Components 180 days

SF-B1509 Frame Construction

The Sunny SF-B1509 indoor cycling bike features a steel frame that supports all sorts of spin workouts. In addition, it’s considerably more substantial than the average mountain bike, having an entire assembly of 105 lbs (47.6 kg).

Sunny SF-B1509 Indoor Cycling Bike

This weight results in excellent overall stability. Alternatively, the bike won’t rock even if you engage in a more demanding workout or stand up on the pedals. On top of that, both the bike’s bases have adjustable stabilizers with rubber caps.

Therefore, it’s not necessary to place it on a rubber mat. Instead, these rubber stabilizers will allow you to perfectly level the bike on uneven flooring and provide a superior grip on the floor, preventing it from sliding forward or backward.

The bike’s frame features an industrial-grade, corrosion-resistant powder finish, white. The seat post and the handlebar post are chrome-coated, though. The flywheel’s belt guard and the upper guard are made of durable plastic materials.

This Sunny Health & Fitness exercise bike isn’t a giant for a cardio training machine. It’s only 49″ (124 cm) long and 20″ (51 cm) wide but does require at least two feet of clearance on the sides for safe and unhindered operation.

Its frame doesn’t fold, but the front base features transport wheels, facilitating the assembled bike’s relocation. This exercise bike is an excellent choice for a cardio machine if storage and usage space are limited.

Seat and handlebars

The Sunny SF-B1509 exercise bike comes with a standard saddle, which is not as thin as other seats found on spin bikes. Thus, it provides a bit more comfort, but it’s not an incredibly comfortable seat.

However, its connection point to the post is conventional, so you can easily find a replacement. Also, a gel cover will improve its comfort.

The seat is 4-way adjustable, up, down, backward, and forward. Its vertical post has nine adjustment holes, approx. 1″ apart from each other. Thus, the bike can accommodate users with an inseam between 28″ and 39″ (71 – 99 cm), or differently put, users between 5’0″ and 6’5″ (152 – 195 cm).

Sunny SF-B1509 Indoor Cycling Bike
Sunny SF-B1509 Indoor Cycling Bike

This seat is the main element that supports the user’s weight, so in this case, it can hold users up to 300 lbs (136 kg).

The handlebar doesn’t offer horizontal adjustability, only upright. It has a multi-grip design with a unified aerobar, allowing it to adopt leaned-forward workout postures. A rubber foam material covers the whole handlebar assembly to provide a non-slip and comfortable grip.

Both seat and handlebars feature large knobs, easy to turn and pull. Thus, adjusting the bike to your requirements takes less than a minute.

SF-B1509 Drive

Stay in command of your workout with the exercise bike designed for maximum stability for quiet and controlled training. In addition, the belt drive is low maintenance and is very smooth to encourage a longer workout.

The bike’s flywheel weighs 40 lbs (18.1 kg), more than enough for a steady and smooth pedaling motion with consistent momentum. It’s also a perimeter-weighted flywheel; therefore, it minimizes the “Stairmaster” effect, which may be present in other bikes if the resistance is too tight.

This exercise bike allows reverse pedaling. But the pedals will continue to spin for as long as the flywheel is spinning. Therefore, it’s advisable to use the emergency brake if you want to change the pedaling direction. Also, since this is an exercise bike, it doesn’t integrate a great shifter or a derailleur like a road bike, so you cannot coast on it.

The crankset equipped on this exercise bike is a 3-piece model featuring solid steel crank arms, which can support the user’s whole weight and just about any spin workout, as long as the user doesn’t exceed the specified maximum weight of 300 lbs (136 kg).

The pedals are dual-sided, with SPD clips for spin shoes on one side and toe cages with straps. They’re durable, made of metallic alloy, and feature standard 9/16 threads, so replacements for them are widely available.

Sunny SF-B1509 Indoor Cycling Bike

The bike’s Q-Factor (spacing between the pedals) is relatively narrow compared to other spin bikes, allowing a natural positioning of the feet onto the pedals and eliminating the knees’ lateral stress.

Resistance system

The Sunny SF-B1509 features a friction-type resistance system. The brake pad combines an EVA layer and a cow’s leather layer for contact with the flywheel, and the pad connects to the turn knob on the main tube of the bike. Thus, as you turn the knob clockwise, the pad will pressure the flywheel, generating more resistance.

The resistance knob of this bike does not have any “clicks” or levels marked on it. Instead, you tighten it until the bike offers the required tension for your workout. Alternatively, you can tighten it to the point you can barely pedal.

SF-B1509 Assembly and Maintenance

Some of the parts come pre-assembled from the factory. For example, the flywheel, the chain, the crankset, and the brake elements are pre-assembled into the mainframe.

Therefore, you’ll need to add the base tubes to the structure, the seat and handlebar’s posts, the saddle and the handlebar itself, and the pedals. All the tools required for assembly and a manual that provides clear instructions come with the bike. The whole task shouldn’t take more than 30 min.

The bike’s maintenance requires a periodic inspection for loose bolts and parts and re-tighten if necessary. The resistance pad may also need some lubrication with non-abrasive silicone lubricant if it makes a squeaky noise when in contact with the flywheel.


Sunny SF-B1509 Indoor Cycling Bike
  • Solid steel frame, sturdy construction;
  • Elegant design;
  • Rubberized, adjustable foot stabilizers;
  • Multi-grip handlebar with unified aero bars;
  • Perimeter-weighted, heavy flywheel for consistent momentum and smooth pedaling;
  • 4-way adjustable seat;
  • Durable belt drive;
  • Solid crankset, substantial enough for all-range of spin workouts;
  • Comfortable Q-Factor considerably reducing the lateral impact on the knees;
  • Dual-action pedals, with SPD clips on one side and toe cages on the other side;
  • The bottle holder included;
  • Not an extremely heavy fitness machine that is easy to transport;
  • Easy to assemble;
  • Little maintenance is required.


  • It doesn’t include a fitness monitor;
  • The handlebar only adjusts vertically.

Sunny SF-B1509 Indoor Cycling Bike Summary

The Sunny SF-B1509 indoor cycling bike is for home use. It withstands users up to 300 lbs standing up on the pedals and is a bike made for spin workouts. It features a standard friction resistance system, a durable belt drive, dual-sided pedals, and a 4-way adjustable seat.

Moreover, it’s an exercise bike for users of all levels, great for light to intense cardio, interval training, and weight loss. Finally, it’s an affordable indoor cycling bike, usually on sale for around $400. In all, it offers excellent value for the price.

I hope you found this article helpful and informative. Please speak up if you have anything you’d like to share on the topic or 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.

7 thoughts on “Sunny SF-B1509 Indoor Cycling Bike | Great Way to Stay in Shape”

  1. This is such a detailed review! And while gyms remain closed due to Coronavirus, I am struggling to find ways to work out at home. This might be a perfect solution for me. I have done stationary biking before, but the seat has always been pretty uncomfortable and hard as a rock. That’s the kind of useful information I look for when I am trying to research home workout equipment! Thank you!

    • Hi Janani, I hope you are well. Replacement seats are available or gel cushions are an option. Unfortunately, comfortable seats are a problem with spin bikes. The reasoning is the user will be standing up most of the time for a spinning workout and not much thought is put into a comfortable seat.

      All the best!

  2. Thanks for the thorough review of the product, very detailed. Everything I need to know about the product is here, and a great comparison with the older model, highlighting the differences and upgrades of the newer exercise bike. It is also vital that this review has pointed out a couple of negative points, such as the handlebars only adjust vertically and the seat not being the most comfortable out there, which is easily replaceable, so it’s not much of a problem. Also, I like the fact that you can adjust the settings to suit your fitness level, and the bike’s assembly is easy.

  3. Being able to exercise at home is such a great advantage. With more people wanting to get into shape for warmer weather, this Sunny SF-B1509 indoor cycling bike can undoubtedly help them. In addition, the exercise bike is easy to move around, which is a great feature if one has limited space and wants to move the bike when not in use.

    Although the bike is suitable for users of all levels, you can only use the handlebars in the vertical position, which might not appeal to everybody. But, apart from that, it has some excellent features.

    • Hi there, thanks for stopping by and sharing your thoughts with us. Would you please let me know if I may further assist you with exercise equipment? I’m always happy to help.

      Kind regards, Robert

  4. Hi Robert,

    The Sunny SF-B1509 looks like a great piece of gym equipment!  Your review is very detailed and gives me all the information I need o to determine if this is the right product for me. 

    I have been wanting a bike but haven’t been impressed with the available models I have seen to date.  This bike looks sturdy, and I like its little padded feet.  It seems more compact than some I have seen, yet it isn’t so compact that it would be difficult to maneuver.  

    Thanks for posting,


    • Hi Chastity, thanks for stopping by and sharing your thoughts with us. Would you please let me know if I may further assist you with exercise equipment? I’m always happy to help.

      Kind regards, Robert


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