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Sunny Health & Fitness released the Sunny XL SF-B2721 as one of their exercise bikes in early
2018. It is exactly the same as the Exerpeutic Gold 500 XLS, however, unlike the Exerpeutic
model; its seat has a backrest.

Therefore, this dual bike is designed to provide extra comfort. Also expensive, currently available for under $ 200. Sunny Health & Fitness SF-B2721 Comfort XL Folding Semi Recumbent Bike is a large bike with low exercise rates that can vary between straight and semi-recumbent positions (3) to suit a variety of bike styles and working for
different muscle groups. A fully integrated unit is not too large. The frame actually has three
locking positions, offering three different levels of height in the seat and handles.
With the frame locked at its lowest point, the bike is in its longest position, 32 ″ (81 cm) and 21
″ (53 cm) wide. On the other hand, with the frame locked at its highest point, the frame length
is reduced to 24 ″ (61 cm), but the unit height will be up to 49 ″ (124 cm). The frame of the bike
can also be completely wrapped, similar to the BCP SKY2380 bike. The frame is completely
wrapped, the size of which is: 18 ″ L X 21 ″ W X 54 ″ H (46 x 53 x 137 cm). That being said, the
bike can easily fit into small storage spaces. Obviously, since it is an exercise bike designed for
easy cardio workouts, it is not heavy.

For all the components included its weight. 38.5 kg (17.4 kg). That being said, it is easy to
manage and manage. However, its front base bar includes rolling rollers that facilitate its
transport. Sunny Health & Fitness SF-B2721 Comfort XL Exercise Bike has two gripping straps:
flexible handles on the side of the seat for slow-moving bicycles (these handles can be removed
from the easy installation and unloading of the seat, and foam-mounted ribs on the side of the
vertical bicycle mirror. heart rate monitoring your heart rate as you exercise).

Technical Details and Specifications

  • 32L x 21W x 49H inches are the overall dimensions (81L x 53W x 124H cm)
  • Combined weight: 38.5 lbs (17.4 kg)
  • Supported weight: 300 lbs (136 kg)
  • Handlebars: Impossible
  • Seat: Flexible
  • Pedals: heavy, corded
  • Resistance: Magnetic, 10 levels
  • Strength Meter: Time, distance, odometer, speed, calories, and heart rate
  • Resources: Bottle holder, tablet holder
  • Warranty: 3 year frame / Parts 180 days
  • Framework

Sunny Health & Fitness SF-B2721 features a steel frame, with two main parts connected in
between. All metal parts in its construction are coated with rust-resistant paint. The color used
is gray, which is the only available color for this unit.

Seat and Handlebars

As mentioned above, this Sunny bike has three frame lock settings that place a bar supporting
the seat in three different slopes. However, the seat post itself has 4 adjustment notes.

Therefore, the bike can accommodate between 4’10”(147 cm) and 5’8 ″ (172 cm) users. Longer users will not benefit from a full leg extension. Also, the seat assembly, as well as the overall frame construction, can support users up to 300 lbs (136 kg). The bicycle seat is designed for high comfort. Both the seat and the back have a 2.5 ″ (~ 6 cm) thick layer of foam wrap, with a breathable strap. The seat itself is 14 ″ (35.5 cm) wide and 10.5″ (26.6 cm) tall, providing plenty of seating space. In case you are wondering, the backrest does not adjust independently from the seat. It attaches directly to the metal back of the seat. It is very strong, providing excellent lumbar support. The height of the seat, as well as the sloped frame, is adjusted with two buttons. Adjustments can be made easily, in less than a minute. However, the bike cannot be repaired while riding. One is attached directly to the seat, the other is attached to the front part of the frame. They do not change; both incorporate rubber grip for better hand grip and comfort. Also, the front handles include heartbeat sensors.

Resistance and Drive

The Sunny Comfort XL semi-recumbent bike incorporates magnetic force to withstand human
action. It has an internal magnetic brake attached to the tension knob on the mainframe
section. When you turn the knob clockwise, the brake is closer to the front, more resistant. The
bike does not require a power source because the resistance system is manual. Also, its console
does not play a role in fixing resistance.
In contrast to other direct or indirect bicycles that have a magnetic resistance system, such as
the Exerpeutic 1000, or the March NS-1201U for example, this Sunny exercise bike offers 10
different resistance levels. The first three levels are simple enough, ready for re-training.
However, levels 8-10 bring a heavy load to attract a bike with light capacity, imitating a steep
The bike is equipped with a 3.3 lbs (1.5 kg) fuel cycle, to give more impetus to the feel and feel.
Although it is not a heavy fan, the bike still offers sufficient resistance or treadmill, especially at
its highest levels, simply because it includes a mediator pulley. This not only adds to the
difficulty but also adds smoothness to the ride.
Like most exercise-resistant exercise bikes, this one has a drive-drive, using two internal belts,
one connecting the intermediate pulley and the flywheel, the other connecting the pedal pulley
and the intermediate pulley. Both belts are made of rubber material; they are standard 240J3
belts and 230J3 V, which should last for many years of use.
The bike crankset is sturdy, fitted with steel arms. However, it doesn’t last long enough to
support writing while standing on pedals. Not only that but stepping on the ground while
standing can also lead to poor posture as a result of bicycle construction. The embedded pedals

are made of heavy plastic material with a metal inner core. And they are lightweight, and they
have flexible straps so you can completely protect your feet from them.

Console and Accessories

This exercise bike contains a basic exercise meter. Includes an LCD display that shows the most
important exercise metrics, including time, distance, total distance, speed, calories, and heart
rate. It has battery power and requires two AA batteries installed. It starts when you start
digging and automatically shuts off after 4 minutes of a bike failure.
The meter unit is easy to use. It has only one button (MODE), which lets you select any values that will be displayed on the display, or select a SCAN mode that rotates all values, which displays every 5 seconds. The MODE button also has a reset function; when you press it and hold it for a few seconds, it sets all values ​​in the meter to zero. Clearly, the meter wing is not telemetric. Can’t read your heartbeat with the HR wireless transmitter. Therefore, in order to benefit from heart reading, you need to adhere to the heartbeat connected to the front handles. Depending on the accessories, the bike is fitted with a small media holder and a bottle holder. The news manager is actually integrated into the meter unit. Contains a small shelf that can provide support for your phone or tablet during exercise. The owner of the bottle is attached to the back. It is placed in a strange way for the owner of the bottles, as access to it is a little difficult from the place of residence. However, you can still have your hydration bottle with your bike all the time.

Assembly and Maintenance

In the middle of the frame, the two main pieces are already connected. Also, the driving and
resistance elements are already attached to the front part of the frame and covered with ABS
fabrics. So, in combination, you should only add the bases of the bike, seat, seat, backrest, two
sets of handlebars, consoles, and pedals. This work should not take more than an hour. All the
necessary meeting tools are included, and the provided owner’s manual provides excellent
assembly instructions. Maintenance does not require much. It is recommended to keep the unit
clean and periodically inspect bolts and loose parts. The inner parts do not need to be softened.

Table Chart of Page Contents

Pros & Cons

  • Sturdy frame for small training bike – 300 lbs;
  • Transport wheels included;
  • A small foot there fully covered;
  • Folding, beautiful in a small apartment;
  • Three key positions;
  • Four seat adjustment positions;
  • Thick folding in the seat and back;
  • Two sets of handles;
  • Pulse Sensors;
  • Pedals weigh;
  • Zero lateral stress on the knees and ankles due to a small Q-factor;
  • 10 levels of magnetic resistance;
  • Smooth and quiet operation;
  • Solidity meter installed;
  • Meter batteries included;
  • Installed tablet holder;
  • Included is the owner of the bottles;
  • Easy to assemble;
  • Less maintenance is required.
  • The holder of the bottle is placed on the back which makes the water bottle difficult to access without descending;
  • Calorie counting of the meter is not very accurate;
  • The meter display has no background light.


Sunny Health & Fitness Comfort XL SF-B2721 is a dual bike designed for home use and light
exercise. Includes a frame with 3 positions and 4 seats to adjust the seat. It has a folding frame,
easy to handle, and keeps away. It is fitted with a 10-level magnetic field resistance system and
includes a rigid meter. And finally, it is an inexpensive bike, which offers a very good price.
Can vary between vertical and semi-recumbent positions (3 positions) in Sunny Health & Fitness
SF-B2721 Comfort XL Folding Exercise Bike, Adjustable image between vertical & semi-
recumbent (3 positions) framed wrap in Sunny Health & Fitness SF -B2721 Comfort XL
Recumbent Exercise Bike, photo wrap. Let’s take a look at the features of Sunny Health &
Fitness SF-B2721 that are easy to read to help you decide which exercise bike is best for you:
See what other customers buying Sunny Health & Fitness SF-B2721 Comfort XL Folding Semi-
Recumbent Bike should say with: