Sunny Health & Fitness SF-B1805 Review: Sturdy But No Tech

The Sunny Health & Fitness SF-B1805 Spin Bike is a sleek, chic, and user-centric spin bike that’s built and designed for the ultimate simplified spin bike experience. The efficient and ergonomic addition to the illustrious Sunny Health & Fitness SF-B1805 streamlines the spin experience, removing unnecessary and expensive frills and excesses from the design process to create one of the most powerful and portable spin bikes on the market. The Sunny Health & Fitness SF-B1805 spin cycle ushers minimalist grace and streamlined performance elements into the spinning experience, making anyone into a spin enthusiast without sticking them with unnecessary jargon and overly complicated machinery. The Sunny Health & Fitness SF-B1805 Spin Bike combines simple yet quality design and intuitive user-friendly parts for an innovative and simple spin experience (though it may be slightly overpriced).

The Sunny Health & Fitness SF-B1805 spin cycle appeals to every type of spinner due to its customizable intensity and user-focused, ergonomic spin design. Many home athletes working in constrained spaces find themselves drawn to the stable yet portable build of this bike that offers a heavy-duty and long lasting performance no matter how many times you put it to the test while being relatively compact and lightweight. Having a private gym-quality spin bike in your home is not only a huge convenience but also a majorly motivating fitness tool that can make your personal workout goals feel more achievable than ever before, and it’s easy to tuck this cycle into a closet whenever you’re not using it to maximize space efficiency. This gym-quality bike is available for an average price: $600 depending on the retailer, but in comparison to the features it does not have, is that price worth it?

Beyond a sleek and user-friendly build, the technical aspects of the Sunny Health & Fitness SF-B1805 cycle are worth noting as well. Built with a powerful fixed front-mounted aerodynamic flywheel that pairs seamlessly with Sunny’s signature magnetic resistance while maintaining the same powerful drive of an outdoor bike, this cycle provides an effortless push and intense spin for solid workout progress. The SF-B1805 belt drive ensures a smooth and hard-working ride that will feel like you’re pedaling in the sky, creating a gentle and low-impact exercise that can still be scaled up to harder and harder levels should you so choose.

An astonishing feat of minimalist construction and contemporary fitness equipment, the Sunny Health & Fitness SF-B1805 bike is sturdy equipment that should please most beginner cyclists. The powerful transmission and resistance system powers sleek and intentional pedaling, pairing with the ergonomic saddle and guided pedal design to create workouts that offer maximum fitness impact with minimum physical impact on your body. High-performing and low-maintenance, the Sunny Health & Fitness SF-B1805 spin cycle measures 47″ L x 22’ W x 44” H and fits neatly into any tight-space area for efficient and powerful exercise.

Specifications to See if You Have Space For the Bike:

  • Width: 22”
  • Length: 47″
  • Height: 44”
  • Bike Weight: 125 Pounds
  • Max User Weight: 300 Pounds
  • User Compatible Size Range: 5”0” to 6’5”
  • Transportation Wheels

No Digital LCD Monitor Included with the Bike:

A big con on the SF-B1805 is the total lack of a digital or LCD monitor. Unlike many fitness bikes on the marketplace and other bikes in the Sunny Health and Fitness line, there’s no included digital monitor, at least not built into the bike. There’s no cadence sensors, no pulse sensors, no heart rate tracking: nothing. In order to incorporate any kind of tracking, you have two options: buy the add-on compatible fitness monitor designed to clip onto the bike or use your own tracking gear.

Compatible add-on monitors for spin bikes sold by brands like Schwinn can run close to $200, an additional fee tacked onto the already pricey initial purchase of this bike. Even if you choose to purchase an additional monitor, odds are that it will be relatively low-tech, offering the bare essentials of RPM, distance, cadence, time, and calories, which is simple compared to its price tag and to other monitors featured on competitor bikes. If you’re looking to track biometric statistics like heart rate or get a more accurate read on burned calories, you’ll have to rely on a smartwatch or a third-party fitness tracker that will again cost more, or set up a tablet on the personal device holder built into the handlebars. You can also buy power pedals or cadence sensors to try and grab some of that data to help during your workout, but that’s yet another additional fee tacked on to the top. For a bike with such a high initial price point, it’s a bit surprising that these tech features aren’t already built-in.

Caged Equipped Pedals and Q Factor Size:

  • Metal pedals have toe cages for additional security
  • Not SPD compatible
  • Narrow Q-Factor

The pedals included on the Sunny SF-B1805 bike are fairly standard as far as non-SPD pedals go: simple bike pedals with included toe cages to keep your feet from slipping off the pedal mid-stride. However, they are not SPD compatible, which could be a big issue.

SPD is a must-have for any cyclist. Most SPD pedals are double-sided – that means you can clip into either side of the pedal, which makes starting from a stationary position (not pedaling) a lot easier. Some riders prefer the additional security that comes from knowing that you need to push hard to move the wheel, but if you’re just starting out you may want less tension. For beginning riders, not being able to train with SPD compatibility could be a problem if you’re looking to increase your spinning abilities, but if you’re just looking for a standard indoor bike these pedals will do the trick. You can also always order SPD-equipped replacement pedals; the Sunny SF-B1805 has a standard 9/16” pedal thread, replacements are pretty easy to pick. The pedals unscrew easily to replace, making swapping out for better versions simple though an extra, annoying expense.

The q-factor on the Sunny SF-B1805 bike isn’t specifically listed by manufacturers, but it’s a safe bet this bike features a narrow q-factor stance. The Sunny SF-B1805 provides a narrower q-factor that will set riders up for ergonomic success and minimize strain on the body. A narrow stance is generally preferred for spin bikes because it positions the feet and knees in a line that drives smoothly downwards, allowing maximum drive on the pedal and creating ergonomic positioning for legs and knees that reduce strain on joints and other muscle functions especially when you’re leaning or moving around on the bike, so this is definitely a pro when it comes to the bike’s overall functionality

Sunny Health & Fitness SF-B1805 Flywheel:

  • 44 lb fixed flywheel
  • Unguarded front-mounted fixed flywheel

The Sunny SF-B1805 flywheel is part of an intense magnetic resistance system that provides easy, smooth starting and stopping in addition to speedy rotations and pedalling.The fixed rear flywheel generates powerful torque that propels the pedals forward as you push, meaning you work hard not only to move the flywheel but to keep up with it once you’ve set it in motion. The front mounting does manage to expose the flywheel to plenty sweat and damage that could erode or degrade the flywheel mechanisms, and since it’s unguarded this could also be a danger, so consider giving your flywheel a wipe-down after particularly intense rides to help maintain your flywheel in a continually powerful condition while still demanding a durable performance from your ride.

The heavy-duty silent belt drive system, rear-mounted lightweight flywheel, and strong, steel and solid steel frame mean your durable flywheel and transmission system will withstand years of riding. Just like the rest of this bike, the flywheel is built to last, so you’ll have no problem riding it for many years or taking it with you if you move homes, apartments, or gym spaces. However, the unguarded and slim nature of the flywheel can also make it a danger to smaller children or pets who aren’t able to protect themselves from the spinning danger, so keep that in mind when you’re looking to purchase.

Sunny Health & Fitness SF-B1805 Bike Resistance:

  • The Sunny Health & Fitness SF-B1805 Spin Bike offers variable magnetic resistance that delivers infinitely variable micro-adjustable resistance levels for a more powerful workout
  • Adjustment resistance knob gradually rolls up resistance before or during rides without dramatic jerks or jolts in your ride

The Sunny Health & Fitness SF-B1805 spin bike relies on standardized magnetic technology to generate the perfect in-workout resistance system. The magnetic resistance reacts instantly to a user’s magnetic increase or decrease using the resistance knob, creating a silent but responsive adjustment that fits well into any workout. This is one of the features that make it one of the favorite magnetic spin bikes. Generated by multiple metal magnetics disks through a magnetic field, this spin bike features a resistance knob that rotates the magnetic bar closer to the flywheel, then allowing a rider to adjust the resistance settings to whatever their personal preferences are with ease. With these manually adjustable resistance levels, you can easily create a long, slow cardio burn style workout or match pace for hill, terrain, or HIIT training styles, making your workout much easier to manipulate to your needs.

Handlebars and Seat Adjustments and Comfort:

  • Height adjustable multi-position handlebars
  • Four-way adjustable padded seat

The SF-B1805 adapts to a wide range of user heights and sizes thanks to its seat height and latitude adjustments. There are also height adjustments on the multi-position handles, so you can find customizable adjustment angles that make your bike infinitely adjustable in all directions, so you can find your perfect fit with much greater accuracy and detail than other spin cycles offer. The multi-position handlebars are a big pro also for riders who need flexibility with positioning and stances while riding or standing up on your cycle. Both of these features combined make it easier to switch between users without having to realign your entire bike with a wrench or toolkit. An included water bottle holder on the side of your frame provides extra hydration support the whole time!

Sleek Belt Transmission and Gear Ratio:

The Sunny Health & Fitness SF-B1805 spin bike’s transmission drive system features a functional and low-maintenance belt for easy drive. This high-performing and low maintenance transmission belt works around the clock to provide smooth performances on every ride. Belt systems eliminate the rustle and clank of typical chains that road bikes feature, especially important on such a speedy and quickly performing bike like the Sunny SF-B1805. The SF-B1805 belt stays in top shape for a long time without needing a lot of work.

The transmission belt drive provides a superior drive experience, including a tight fit to the gears thanks to a hardworking gear ratio and a smooth overall ride. You won’t ever feel your pedals slip, jerk, or catch with the Sunny SF-B1805 belt, leading to a consistently smooth ride that will feel like you’re pedaling on air. Pedaling this bike is a full-body-workout experience that maintains a strong drive and tough resistance that will challenge you during any workout without the clanking or creaking you’d expect from a typical chain. The low-noise component of these belt drives is another major benefit that’s second to none; when combined with the signature Sunny SF-B1805 magnetic resistance system this bike is virtually silent, meaning you can go for a spin anywhere, anytime without worrying about creating a racket.

Bike’s Price and Warranty Evaluation:

  • The Sunny Health & Fitness SF-B1805 spin bike is currently priced at around $600 depending on the retailer, making one of the best budget spin bikes
  • The Sunny Health & Fitness SF-B1805 spin bike’s warranty is inconsistent; if you buy it through Amazon, however, the warranty lasts thirty days and is not honored in Canada

If you need parts for this bike while still under warranty, depending on who you purchased this cycle from you can visit the and fill the form out completely to order the part.

The price of this bike in comparison to the range of features it offers and the range of other bikes available is not great, but if you are shopping for spin bikes under 500, this is one of the options to consider. The lack of a digital monitor and SPD pedals are big cons that don’t really make sense for a bike that’s priced this highly. These are average quality bikes that are available at a pretty overpriced rate, especially when you look at the limited warranty and the lack of overall reliable features.

Easy of Assembly and Shipping Process:

  • Shipped in one package, with assembly required
  • Takes about two weeks days to arrive
  • Package is 47″ L x 22’ W x 44” H and weighs 125 pounds

Assembling your Sunny Health & Fitness SF-B1805 spin bike is easy. Following the included and clearly diagrammed and labeled manual will help anyone figure out how to assemble this bike, and you can always look online for additional videos to show how to put the more complex parts together. The more detailed parts, such as the flywheel and the chain system, come pre-assembled, so you won’t need to worry about how to assemble the inner workings of the bike. Follow the instructions alongside a partner and expect to get this device fully assembled within an hour!

Sunny Health & Fitness SF-B1805 Indoor Bike Pros:

Powerful and Ergonomic Design:

The Sunny Health & Fitness SF-B1805 manages to pair both power-based design with a rider-centered, ergonomic performance to create the ideal exercise equipment for spinners ready to commit to spin fitness. The SF-B1805 bike delivers a strong drive and tough resistance that pushes riders hard and provides a consistently quality workout time and time again. Sunny Health & Fitness’s strong record of high-performing and quality exercise equipment means their SF-B1805 will likely perform just as sleekly, strongly, and efficiently as their other bikes, and becomes yet another reminder of the continually high-quality offerings that Sunny Health and Fitness brings to the table. The ergonomic and sleek design of the affordable yet powerful SF-B1805 creates a reliable drive and consistent ride that elevates your workout to the next level.

Silent Rear-Mounted Resistance:

The magnetic resistance system is a strong component of the Sunny Health & Fitness SF-B1805 spin bike. The sleek braking, no-slip belt work together to make an intense workout that you can count on to push you to new heights. The magnetic system is also highly durable and infinitely adjustable thanks to the infinitely variable resistance knob meaning that your bike is very customizable. The resistance mechanisms are all durably built and constructed, meaning you can expect your bike to provide quality performances throughout its lifespan.

Sunny Health & Fitness SF-B1805 Indoor Bike Cons:

No SPD Pedals:

The lack of SPD-integrated pedals is an equally big issue here. SPD is a huge component of spin and cycling, so not having pedals that are compatible with cleats or other elements of the SPD pedaling system feels like a major miss. Though you can easily replace your pedals with third-party options, it’d be nice to not have to spend so much money on upgrades right away and have good quality SPD pedals simply be included with the bike.

No Included Workout Tracking:

The complete lack of a digital monitor or workout tracking tools on the SF-1805 bike is without a doubt the biggest disappointment. Not having any form of digital monitor feels like a glaring oversight in the product design, and the complete absence of Bluetooth and ANT+ connectivity is a major setback. Not being able to connect to exterior apps is a major negative and limits your ability to perform and connect with other third-party apps as well as track your performance progress long term.


The Sunny Health & Fitness SF-B1805 Spin Bike is a reliable if not overpriced staple of the spin bike marketplace that is an okay fit for home use but probably not ideal for any gym, studio, or professional workout space. The powerful design, adjustable frame, and durable build mean this bike will last you many years and can withstand all types of workouts by all types of riders, but the lack of higher-tech components like SPD pedals or a monitor set it back in terms of ability level. The Sunny Health & Fitness SF-B1805 offers a lot of good performance capabilities, especially when it comes to the drive components, such as the flywheel, and its durability makes it a long-lasting investment, but it is definitely not with a $600 price tag.

The Sunny Health & Fitness SF-B1805 indoor spin bike is a lower to mid-range bike that comes with quite a few drawbacks considering its steeper price point of $600 or so. The absence of a workout monitor is extremely disappointing, as is the absence of pulse and cadence sensors that might have made it a worthy investment in the spin machinery world. Its strong and durable resistance system ensures consistently intense workouts that will build your resistance intensity up and allow you to scale up your workout intensity time after time for a powerful and ideal workout, a major plus, but when you stack that against all the things the SF-B1805 is missing, it just doesn’t feel like it’s worth it.

Sayed Hamed Hosseiny Author at

About The Author: Sayed Hamed Hosseiny

Hi, I'm Sayed Hamed Hosseiny, a seasoned semi-professional indoor cyclist with nearly two decades of experience in fitness equipment. Though retired from competitive cycling and rowing, I'm passionate about sharing my coaching expertise. Join me as I explore the world of indoor bikes and rowing machines in the UK, offering valuable insights to maximize your fitness journey.

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