Sunny Health & Fitness Air Bike Trainer SF-B2640

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Sunny SF-B2640

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250 lbsAirSpeed,
Frame: 3 years
Parts: 90 days

Along with the Asuna Minotaur and Sunny SF-RB4708 recumbent bike, the air bike SF-B2640 is one of the newest exercise bike released in 2017 by Sunny Health & Fitness. It’s an affordable bike, quite similar to the Marcy NS-1000 when it comes to specs. However, it’s base frame is more solid, and the moving handlebars feature a dual-grip design.

Technical Details and Specifications

  • Assembled dimensions: 49.5L x 31.5W x 55H inches (126L x 80W x 140H cm)
  • Assembled weight: 71 lbs (32.2 kg)
  • Supported weight: 250 lbs (113.3 kg)
  • Drive: Belt
  • Resistance: Air
  • Fitness meter: Time, speed, distance, odometer, calories, SCAN
  • Warranty: Frame 3 years / Parts 90 days

Frame construction

The Sunny SF-B2640 is a pretty sturdy bike, featuring a steel frame construction with corrosion-resistant and scratch-resistant powder coating. The paint used is gray in color, this being the only color available for the frame of this exercise bike. The bike’s construction also integrated several plastic parts, but these do not affect its overall sturdiness and stability, as most of them fulfill a protective or aesthetic purpose. Among them, we can count the belt guard and the base bar end caps.

Speaking of stability, there are several factors that improve it for this exercise bike. To begin with, it weighs over 70 lbs, which is two times more the weight of a road bike. This weight plays an important role in its stability.

Both base tubes feature stabilizers. The rear base stabilizers are adjustable, a feature that permits the perfect leveling of the bike on any surface. The front base rests on rubberized pads, providing an excellent grip on the floor. Also, the triangular design of the base tubes provides more contact with the floor, being superior to cylindrical tubes.

The front base integrates two transport wheels. These facilitate the bike’s relocation once you have finished with your workout.

This upright exercise bike does not take too much space. It’s 49.5″ (126 cm) long, while its total width is given by the handlebars, which is approx. 31.5″ (80 cm). The highest point of the bike is given by the top of the moving bars, being approx. 55″ (140 cm). These being said, you will need a usage area for this fitness machine of approx. 60″ x 50″ (152 x 127 cm) in order to be able to exercise without any hindrance.

Seat and handlebars

The Sunny Health & Fitness SF-B2640 features a 4-way adjustable seat. This is quite a plus for an exercise bike in this price range. Its horizontal slider offers an adjustment span of several inches, while the upright bar has 8 adjustment holes, providing an adjustment range between 25.5″ and 35.5″ (65 – 90 cm) from the lowest pedal. This being said, the bike can accommodate users between 5’0″ and 6’6″ (153 – 198 cm).

The bike’s saddle is a pretty standard one. It provides optimal comfort, featuring a contoured surface and a thin layer of padding. If you’re new to cycling there’s a chance you may find it a little uncomfortable. However, since it’s a standard saddle you can easily find a replacement for it; or, you can improve its comfort by a gel cover.

This Sunny exercise bike features only one set of handlebars. They’re both attached to the pedals and will continue to move for as long as you pedals, or for as long as the flywheel is spinning. They cannot be locked in place. Also, they cannot move independently from the pedals. Each moving bar is equipped with dual grips, vertical and horizontal, offering the possibility to put some diversity into your workouts.

Drive and resistance

The Sunny SF-B2640 air bike is equipped with a belt drive. There are two main benefits to this type of drive; one, it doesn’t require lubrication, and two, it minimized vibration and the related operation noise is almost inexistent. However, since this is an air bike, the fan will generate a bit of noise during usage.

The flywheel fan is 17″ (43.1 cm) in diameter. It’s not metallic, but it’s thick and durable enough to perform and last for many years without any issue. Its protective cage is metallic though, featuring a chrome finish. The flywheel is bi-directional. This means you can pedal and/or move the handlebars in reverse, which gives you the possibility to diversify your workout routines.

The bike’s crankset is highly durable, featuring solid steel crank arms. However, keep in mind that this is an upright bike, not a spinning bike, so it’s designed exclusively for seated workouts. Standing up on the pedals is not recommended as it may cause damage to the internal parts.

The pedals are self-leveling; they’re made of a metallic core and a heavy-duty PVC shell. They’re equipped with adjustable straps, in order to provide maximum foot stability during exercising. They also have standard threads, so in case you want to replace them, compatible options are widely available.

When it comes to resistance, the fan pretty much speaks for itself. The fan generates a dynamic response. In other words, the faster you pedal and/or move the handlebars, the more resistance you will get. However, this exercise bike also offers the possibility to adjust its overall resistance. It’s equipped with a small brake attached to the tension knob on the console mast. By turning the knob clockwise the overall resistance will slightly increase.

There aren’t any resistance levels or “clicks” specified on the knob. So, this being said, you can tighten it up to the point where you feel that the overall resistant corresponds to your needs.

Exercise meter

The fitness meter included with the Sunny Health & Fitness SF-B2640 air exercise bike is not exactly an advanced unit as for the LifeCore Fitness Assault Air bike but does offer the possibility to set targets for time, distance and calories. It’s equipped with a large display which can show distance, total distance (odometer), speed, time, and calories burned.

The meter unit is easy to use. To begin with, it has a SCAN function which repeatedly displays time, distance, odometer, calories, and speed in a sequence of 6 seconds at the time. You can turn off the SCAN function via the MODE button, and this way lock only the value that interests you on the display. The SET key allows you to set targets for time, distance and calories, and the selected value will countdown from the target that you’ve chosen. Evidently, the RESET button covers the unit’s reset function; by pressing it all the values will be cleared to zero.

The meter unit is not telemetric. It cannot track your pulse in any way. It also does not have any online connectivity.

The console unit has a sleep function in order to save battery life. It turns off automatically after 4 minutes of inactivity on the bike. It starts up when you begin to pedal or when you push one of the buttons. It requires 2 AAA batteries to function.

The meter unit is equipped with a tablet holder. This accessory is placed between the display and the keys. Its placement is a bit inconvenient as a tablet placed on it will cover the console display.

Assembly and Maintenance

The main part of the bike, including the main frame, the fan, the crankset and the belt come already assembled. Therefore, you will only have to add the bike’s base bars, the console mast, the console, the moving arms, the pedals and the seat. This shouldn’t take more than an hour. All the tools required for the bike’s assembly are included. Also, the manual provides pretty comprehensive assembly instructions.

Since it’s a belt bike, its transmission doesn’t require any lubrication. All you have to do for maintenance is remove the dust that may accumulate on the flywheel and its cage, and periodically check for loose bolts and parts.

The Pros

  • Sturdy and stable frame for a small bike, able to hold riders up to 250 lbs;
  • Aesthetic design, aspect that can serve as a good motivation factor;
  • Transport wheels on the front base;
  • Adjustable levelers on the rear base;
  • Mobile handlebars for arms workouts;
  • Dual-grips on each handlebar;
  • 4-way adjustable seat;
  • Air resistance system, great for interval workouts;
  • Resistance adjustability – a feature that other fan bikes do not have;
  • Exercise meter included; 
  • Target settings for time, distance, calories;
  • Tablet holder integrated into the meter unit;
  • Little maintenance required;
  • Fairly quiet operation;
  • Easy to assemble.

The Cons

  • No bottle holder;
  • No pulse sensors;
  • No front pegs for resting your feet if you only want to exercise your arms.


The Sunny Health & Fitness SF-B2640 is an upright exercise bike featuring adjustable air resistance, a durable steel frame, and a console with countdown and SCAN functions. Its seat is 4-way adjustable, and the handlebars feature dual grips. It’s an excellent bike for light to medium cardio workouts, weight loss, endurance training, and muscle toning. It’s not an expensive fitness machine, currently priced for less than $200. So, even though it’s not a commercial grade fitness machine, it does offer excellent value and quality for the price.

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