Cycle your way to fitness with the Sunny SF-B1918 Indoor Cycling Bike with Magnetic Resistance. Slide your feet into the universal toe cages to maintain stability as you exercise. Enjoy ultimate flexibility with the 4-way adjustable seat and ground levelers.
The stationary bike has a leg inseam range between 26.5 and 33 inches. Take advantage of the smooth belt-drive mechanism as you pedal against the 22 lb flywheel. Increase exercise intensity—or bring your workout to a quick stop— with the magnetic resistance, which features an easy-to-use knob.
Keep your workout data accessible when you check it on the included monitor. Track your time, speed, distance, calories burned, and rotations per minute. Control your in-workout entertainment when you place your phone or tablet onto the device holder.
The SF-B1918 provides for enduring workouts, and this cardio machine has a solid steel frame that can support up to 220 lb. After your workout, use the transportation wheels to quickly move this magnetic cardio machine across your home.
Learn more in my complete review below!
Product: Sunny SF-B1918 Indoor Cycling Bike
Warranty: Frame 3 years / Parts 180 days
My rating: 9/10
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: 42.5L x 24W x 51.5H inches (108L x 61W x 131H cm)
- Assembled weight: 63.3 lbs (28.7 kg)
- Flywheel weight: 22 lbs (10 kg)
- Supported weight: 220 lbs (100 kg)
- Seat: 4-way adjustable
- Drive: Belt
- Resistance: Manual magnetic
- Fitness Monitor: Time, speed, distance, calories, odometer, RPM, scan
- Extras: Bottle holder, the device holder
- Warranty: Frame 3 years / Parts 180 days
SF-B1918 Frame construction
The Sunny SF-B1918 indoor cycling bike features a triangular steel tubing frame. All the tubes in the bike’s construction are oval for improved sturdiness and aesthetics. Also, the rear stabilizer is slightly larger than the front one and curved for enhanced stability.
All the frame tubes come double-coated with a corrosion-resistant light gray paint finish. The only exceptions are the seat post painted black and the flywheel, which has a chrome finish.
This Sunny exercise bike is a light-capacity model with a maximum weight limit of 220 lbs (100 kg). The bike itself is also pretty light; with all the parts assembled, it only weighs approx. 63 lbs (28.7 kg) so one person can carry and build the bike.
The bike is not too large. With all the parts assembled, it is 42.5″ (108 cm) long and 24″ (61 cm) wide. Thus, it can fit pretty well in a small room or apartment. However, it is advisable to allow a clearance of at least two feet all around it for easy access and safe usage.
Although the bike is relatively light, it has a low center of gravity, offering excellent stability. Plus, both base stabilizers feature adjustable levelers. The front stabilizer also integrates a set of small wheels for easy relocation.
Seat and handlebars
The Sunny SF-B1918 exercise bike comes equipped with a pretty standard saddle. Its top integrates a durable nylon shell with a urethane cover. Thus, it is not super hard but also does not integrate a very thick cushioning layer. It is relatively large, though, 11″ (28 cm) long and 10″ (25 cm) wide, so it provides plenty of contact surface.
The saddle connects to a triangular plate via three screws. It is four-way adjustable (up, down, front, back). Its vertical post offers several adjustment positions, while its horizontal slider adds a few extra inches of front-to-back adjustment. The applicable inseam range for this bike is 26.5″ – 33″ (67 – 84 cm).
Therefore, the bike comfortably accommodates users between 4’10” and 6’0″ (147 – 183 cm). Taller persons will still use this bike, but they may not benefit from a complete range of motion.
The bike’s handlebar is non-adjustable. Its post attaches to the frame at its base via a set of screws. The handlebar itself attaches to the post via four screws. It does not have a slider like a seat, but you can loosen it up to slightly adjust its angle, then re-tighten it back. Also, it does not have adjustment knobs like the seat.
The bike’s handlebar offers multiple grip possibilities. Thus, you can adopt a standard grip, a cruising grip, a climbing grip, and a semi-aero grip. A layer of high-density foam fully covers it for a comfortable and secure grip. It does not have pulse sensors. The bike also includes a device holder which can attach to the handlebar assembly.
SF-B1918 Resistance system
The Sunny SF-B1918 indoor cycling bike comes equipped with a manual magnetic resistance system. Therefore, it does not require an adapter or an external power source. However, it also does not have pre-set programs, and it cannot adjust the resistance automatically.
The bike’s resistance system uses a magnetic brake pad that attaches under the top mainframe tube above the flywheel. It also connects to the tension knob, so when you turn this knob, the magnets move closer or farther from the flywheel. Therefore, it adds to or reduces the pedaling difficulty.
The main advantage of the magnetic resistance system is that the brake pad does not touch the flywheel. Therefore, the pedaling motion is very smooth and quiet. Also, the brake pad does not suffer any wear since there is no friction, and you don’t have to worry about its replacement.
The bike does not have pre-set resistance levels. Instead, you turn the knob until you get the desired resistance. As a general idea, the pedaling difficulty simulates a steep climb with the magnets as close as possible to the flywheel.
The Sunny SF-B1918 indoor cycling bike comes equipped with a 22 lbs (10 kg) flywheel. Although it’s not super heavy, it is perimeter-weighted, providing pretty decent inertia. In addition, it is chrome-plated for higher rust resistance and has thermoplastic material side panels for improved aesthetics.
The flywheel is bi-directional so that you can pedal in reverse. However, when pedaling in reverse, the resistance remains constant, given the distance between the magnets and the flywheel. Also, coasting is not possible on this bike.
The bike’s drive system uses a 5PK 53″ poly-v belt resistant to stretching and abrasion. This belt drive system comes with several advantages over a chain drivetrain. First of all, you don’t need to worry about its lubrication. Second of all, it generates slightly less vibration than a chain. And third of all, you won’t have to deal with problems such as stiffened chain links.
The Sunny SF-B1918 bike comes with a sturdy crankset featuring oval arms similar to road bikes. The pedals are metallic alloy and pretty durable. They do not have SPD clips for spin shoes but do have toe cages. Their threads are standard 9/16, so compatible options are available in any bike shop if you ever want to replace them.
The Sunny SF-B1918 indoor cycling bike comes equipped with a simple fitness monitor. It features an LCD that tracks time, distance, total distance, speed, RPM, and calories burned. The bike does not have pulse sensors, and the monitor does not have a pulse reading function. The speed and distance are in MPH and miles. There is no option for setting them to metric units.
The unit is easy to use. It only has one button. You can scroll through the workout metrics and select the one you want to view by pressing the button. In Scan Mode, the monitor rotates all the metrics showing each one for approx. 6 seconds. The button also covers the monitor reset function. You can press and hold it for a few seconds to clear all the values to zero.
The fitness monitor unit is battery-powered, and it requires two AAA batteries that come with the bike. It starts up when you begin pedaling or when you push the button. It also automatically turns off if it does not detect any activity on the bike for more than 4 minutes.
SF-B1918 Assembly and Maintenance
The main body of the bike with the flywheel, belt drive, belt cover, brake, and crank, comes pre-assembled. Then, you only have to attach the two base stabilizers, the pedals, the seat post, the saddle, the handlebar post, the handlebar, the device holder, and the fitness monitor.
Therefore, it shouldn’t take more than 30-40 minutes of your time. The task is pretty straightforward, and the manual provides precise assembly instructions. Also, all the necessary tools come with the bike.
Once assembled, you only need to remove the sweat that may fall on the frame at the end of the workout and, in general, keep the bike clean. The bike’s drive system does not require lubrication.
- Fairly sturdy steel frame;
- Aesthetic design;
- Transport wheels on the front base;
- Adjustable levelers on both base bars;
- Four-way adjustable seat;
- Smooth and quiet belt drive system;
- Perimeter-weighted flywheel for improved inertia;
- Frictionless magnetic resistance;
- Durable metallic pedals with toe cages;
- Fitness monitor included – it tracks time, distance, total distance, speed, calories, and RPM;
- Device holder included;
- Batteries for the monitor come with the bike;
- Little maintenance is required;
- Easy to assemble;
- All the tools required for the assembly come with the bike;
- Excellent warranty.
- The fitness monitor LCD doesn’t have a backlight;
- No bottle holder;
- The handlebar is non-adjustable.
Sunny SF-B1918 Indoor Cycling Bike Summary
The Sunny Health & Fitness SF-B1918 is an indoor cycling bike for home use. It features a durable steel frame with a 22-lb flywheel, a manual magnetic resistance system, and a fitness monitor that tracks time, speed, distance, calories, RPM, and odometer.
Moreover, it’s a reasonably decent exercise bike, great for medium and high-intensity workouts, interval training, stamina development, and weight loss.
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 note: Before starting any exercise program, you should consult your physician to determine if you have any medical or physical conditions that could put your health and safety at risk 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.