Sunny Health & Fitness Zephyr Air Bike SF-B2715

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Sunny Zephyr SF-B2715

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240 lbsAirSpeed,
Frame: 3 years
Parts: 180 days

The Zephyr SF-B2715 is one of the air resistance exercise bikes released by Sunny Health & Fitness at the beginning of 2018. It offers a range of features similar to the Marcy NS-1000. It’s pretty much a basic trainer made for home use, but it’s also an affordable one.

Technical Details and Specifications

  • Assembled dimensions: 44L x 24W x 45H inches (112L x 61W x 114H cm)
  • Assembled weight: 60 lbs (27 kg)
  • Supported weight: 240 lbs (109 kg)
  • Drive: Belt / Chain
  • Resistance: Air
  • Fitness meter: Time, speed, distance, odometer, calories, SCAN
  • Warranty: Frame 3 years / Parts 180 days

Frame construction

The Sunny Health & Fitness Zephyr Air Bike SF-B2715 features a durable construction; its frame is rated for a weight capacity of 240 lbs (109 kg). Evidently, most of its frame is made of steel tubing, featuring cylindrical and ovalized bars with precision-welded joint points. The only notable non-metallic parts are the covers of the chain/belt drive elements.

All the steel frame parts are coated with a durable paint finish which is resistant to corrosion. The color used is black, this being the only color available for this exercise bike.

This Sunny exercise bike doesn’t have an extremely heavy structure. Its fully assembled frame weighs approx. 60 lbs (27 kg). This being said, its transport and assembly shouldn’t be a problem for one person. Also, its front base is equipped with two small transport wheels which ease its relocation once you have finished your workout.

The bike isn’t extremely large. With all the parts assembled, it’s approx. 44″ (112 cm) long, and 24″ (61 cm) wide. This being said, it can fit well even into a smaller room. But it is recommended to leave at least two feet of clearance all around it for safe usage and easy access.

Despite its small footprint, the Sunny Zephyr bike offers a pretty decent stability. Its rear base bar is curved and equipped with polygonal caps. These caps can rotate and act as stabilizers, so you can level the unit if the floor is uneven.

Seat & handlebars

The Sunny Health & Fitness Zephyr Air Bike SF-B2715 features a large seat which integrates a layer of padding. Its dimensions are 9″D x 12″W (23 x 30.5 cm), so it provides plenty of contact surface. Its top is made of a durable vinyl material which is also sweat-proof.

The saddle attaches directly to the triangular plate of the upright adjustment bar via three screws. It’s a pretty standard attachment system, and in case you would want to replace the saddle, there should be may compatible options with more cushioning. Also, the seat’s comfort can be improved by a gel seat cover.

The upright bar of the seat has multiple adjustment positions. It’s long enough to accommodate users with an inseam between 21.3″ (54 cm) and 33.7″ (85.5 cm). In other words, it should be able to accommodate users up to 6’4″ (192 cm) comfortably.

The bike’s moving arms are composed of two bars each. The top bars with the grips have two adjustment holes. Therefore, you can adjust their height by a few inches if needed.

The moving arms are equipped with simple grips, with a rubberized cover for extra comfort. They don’t integrate pulse sensors, and the console can’t track your pulse.

Resistance & drive

The Sunny Zephyr SF-B2715 is an air resistance exercise bike. Its main resistance generator is its fan. It doesn’t have any magnetic resistance elements, while the fan doesn’t have a damper to adjust the overall resistance. However, just as any other exercise bike or fitness machine that has an air resistance system, the SF-B2715 provides a dynamic response. In other words, the faster you pedal, the more resistance you will get.

The integrated fan is 18″ (~46 cm) in diameter and weighs 2.2 lbs (1 kg). It delivers plenty of resistance for you to break a sweat and undergo a great cardio workout. It’s made of thick ABS material, while its cover is steel-made with a chrome finish.

The bike’s moving arms are directly attached to the pedals bars. This being said, they cannot be locked. They will continue to move for as long as you pedal. Conversely, the pedals will spin, for as long as you move the arms or for as long the flywheel is spinning. The bike doesn’t have foot resting pegs like the SOLE SB800, or the Sunny Tornado LX SF-B2729. However, you can rest your feet on the top section of the belt cover.

The bike’s drive system uses a belt and a chain, as well as a belt pulley with a crank and the main crank with the pedals. Due to this fact, the pedaling motion is very smooth and has a slightly higher degree of difficulty which is great for toning muscles.

The crank arms are made of solid steel, finished with durable nylon pedals which have weight elements for self-leveling and adjustable straps. The crank and pedals assembly is solid enough to support the user in standing up pedaling routines. Also, the pedals have standard threads, so replacements for them are widely available.

Exercise meter

The bike is equipped with a basic fitness meter. It features an LCD display which indicates five workout metrics, these being time, speed, distance, total distance, and calories burned. As we’ve mentioned above, the unit does not have a pulse reading function. It cannot read your pulse rate through an HR transmitter, and the bike does not have any pulse sensors. Therefore, if you really need to keep an eye on your heart rate during exercising, you will have to use a separate device.

The distance is shown in miles, while the speed is shown in miles per hour. The console cannot be set to metric units.

The meter unit is very easy to use. It only has one button which covers two main functions. The first function is toggling ON/OFF the scan mode. When in scan mode, the console rotates all the workout metrics, showing each one for 5 seconds. When turning scan OFF, you can basically select any of the metrics to be shown on the display all the time. The second function is the value reset. By pressing and holding the button for 3 seconds, all the values on the console will be cleared to zero.

The meter unit is battery-powered; it needs 2 AAA batteries which are included. It starts up when you begin pedaling of if you press the button, and also has a sleep mode to which it will enter if it doesn’t detect any activity on the bike for 4 seconds.

Last but not least, the meter unit integrates a tablet holder, which is placed above the meter display. Therefore, a tablet or smartphone placed on it won’t block the view to your workout stats.

Assembly & Maintenance

The Sunny Zephyr SF-B2715 air bike comes partially assembled. The flywheel, the pulleys, the belt, the chain are already attached to the main frame. Therefore, you will only have to attach the base bars, the foot bars, the moving arms, the pedals, the seat, the front mast, and the console. This may take more than an hour, but the included manual provides very clear assembly instructions. Also, all the tools needed for it are included.

For maintenance, the internal chain, as well as the foot-arm joints, may need lubrication after a while. Other than this, it’s recommended to periodically inspect the bike for broken parts or loose bolts, and keep it clean.

The Pros

  • Sturdy construction – can hold users up to 240 lbs;
  • Aesthetic design, an aspect that can serve as a good motivation factor;
  • Adjustable levelers on the rear base;
  • Transport wheels on the front base;
  • Mobile handlebars for arms workouts;
  • Large, padded seat;
  • Air resistance system for a dynamic response;
  • Fitness meter included – it can track time, speed, distance, total distance, and calories;
  • Tablet holder included;
  • Little maintenance required;
  • Fairly quiet operation;
  • Easy to assemble;
  • Decent warranty.

The Cons

  • No pulse reading function;
  • No bottle holder;
  • No footrests.


The Sunny Health & Fitness Zephyr SF-B2715 is a basic air resistance exercise bike. It features a pretty sturdy construction and has a dual belt/chain transmission for a smooth ride. It’s also equipped with a basic console which tracks the main workout metrics. It’s perfect for muscle toning, recovery training, stamina development, and weight loss. And finally, it’s one of the most affordable air bikes that you can find at the moment, offering an excellent price/quality ratio.

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