Sunny SF-T7873 Folding Treadmill | Tackle New Fitness Challenges

Tackle new fitness challenges with the Sunny SF-T7873 Folding Treadmill with Auto Incline by Sunny Health & Fitness. It’s for both intense running and endurance-driven walking sessions; this machine has a maximum user weight capacity of up to 285 lbs.

The SF-T7873 comes equipped with cushioning technology that significantly reduces the impact on joints. Stepping down on a treadmill deck creates an impact force transmitted back up your shins, legs, and thighs. Sunny’s shock absorption system lessens this shock while simultaneously provides a nice, comfortable running surface.

The Sunny SF-T7873 Treadmill comes equipped with a 5-inch LCD with an LED backlight that tracks your speed, time, distance (both miles and kilometers), incline, calories burned, and heart rate. Mix up your workout with the nine pre-set programs and take advantage of the body fat calculator to set your workout goals to the ideal body mass.

The soft-drop hydraulic mechanism on the SF-T7873 is a great feature that allows the deck to gently lower itself to the floor. The soft drop hydraulic mechanism assures safe, hands-free unfolding. Fold your treadmill for storage and unfold your treadmill when it’s time to work out.

Learn more in my complete review below

Sunny SF-T7873 Treadmill
Sunny SF-T7873 Folding Treadmill

Product: Sunny SF-T7873 Folding Treadmill

Price: For a great deal on this treadmill, merely go here on Amazon

Warranty: Frame 3 years / Parts 180 days

My rating: 7.75/10

Amazon Affiliate Disclosure: I may earn commissions on purchases made through links in this post.

Details and Specifications

  • Assembled dimensions: 62L x 38W x 52H inches (157L x 96W x 132H cm)
  • Running surface: 52.5L x 16W inches (133L x 40.6W cm)
  • Assembled weight: 125.7 lbs (57 kg)
  • Supported weight: 285 lbs (129 kg)
  • Motor: 2.5 HP, 0.6 – 11 MPH
  • Incline: Automatic, 0-15°
  • Console: 9 pre-set programs, 1 HRC program, Body Fat Test
  • Extras: Sound system, bottle holders
  • Warranty: Frame 3 years / Parts 180 days

SF-T7873 Frame construction

Like most other treadmills, the Sunny SF-T7873 features a steel frame. Its base is rectangular tubing, while the upright bars that sustain the console are oval. They come coated with a rust-resistant and chip-resistant paint finish.

Sunny SF-T7873 Folding Treadmill

The treadmill also has several ABS covers, though. The base joint covers, the motors covers, the side rail covers, and the console dashboard are ABS material.

Compared to other treadmills, the Sunny SF-T7873 is not too large. Its footprint is approx. 62″L x 38″W (157 x 96 cm). However, it is advisable to leave at least three feet of clearance at the rear of the deck and at least two feet of clearance on each side to ease access and safe usage.

The treadmill has a folding design, so once you’ve finished your workout, you can fold it up to save some space. With the deck folded up, its footprint becomes 26.5″L x 38″W (67 x 96 cm) while its height reaches approx—57″ (145 cm).

Also, the folding mechanism uses a hydraulic component. Thus, when you unfold it, the deck is slowly lowered to prevent injury or damage.

The front base of the frame features a set of adjustable stabilizers. However, the middle base and the rear stabilizers come equipped with wheels. The mid wheels are for relocating the machine when it is in the folded position.

Deck construction and incline

The Sunny SF-T7873 folding treadmill offers a running surface of 52.5″L x 16″W (133L x 40.6W cm). It’s not too large but should comfortably accommodate users up to 6’0″ (183 cm). Taller users should also use the machine, but they may not perform a complete motion range.

The deck also has a maximum user weight capacity of up to  285 lbs (129 kg), which is not bad for a home-use treadmill.

The machine uses a multi-ply belt. The top layer of the belt comes rubberized to provide a superior grip. Also, even though there aren’t any cushioning elements visible on the sides of the deck, the Sunny SF-T7873 does have several rubber pads under the side rail covers, which reduce a bit of the impact generated by each foot strike.

Sunny SF-T7873 Treadmill
Sunny SF-T7873 Folding Treadmill

This Sunny treadmill comes equipped with an automatic incline system. This means that the incline is adjustable while you are walking or running on it. It also means that the console can adjust the pitch automatically.

The machine’s incline system consists of a slight lift and a motor (different from the drive motor). As you adjust the incline (or as the console changes the pitch), the motor triggers the lift to elevate or lower the deck’s front section.

The deck’s incline is adjustable from either the controls integrated into the machine’s left handgrip or from the +/- controls on the console. There are also controls for the quick selection of the 2%, 5%, 9%, and 12% incline levels.

The machine makes available an incline range of up to 15%. However, it is essential to note that with the incline set to 0%, the deck is not 100% horizontal. It still has a bit of pitch and a step-up deck height of approx—9″ (23 cm).

However, with the incline set at maximum, the front part becomes elevated by several inches. Therefore, it’s best to place and use the machine in a room with a ceiling that exceeds your height by at least 16″ (41 cm).

SF-T7873 Drive motor

The Sunny SF-T7873 is an electric treadmill. It comes equipped with a 2.5 HP drive motor. Although it doesn’t offer the power of a commercial-grade treadmill motor, it still provides pretty decent performance. The manual specifies to turn off the machine for at least 10 minutes after every 2 hours of use.

The treadmill’s default starting speed is 0.6 MPH, and the motor offers speed levels up to 11 MPH. The speed adjustment is in 0.1 MPH increments, so you can quickly adapt your pace when you change the speed.

Just like the incline, the machine has speed adjustment controls integrated into the right handgrip. There are also gradual adjustment speed controls on the console and quick adjustment speed controls for 1 MPH, 3 MPH, 5 MPH, and 9 MPH.

Sunny SF-T7873 Folding Treadmill

Since it’s not a super powerful motor, the machine’s power usage is also relatively small. Therefore, even if you will be using it daily, it shouldn’t add more than a few dollars to the electricity bill. Also, the motor itself doesn’t create a lot of noise when in use, but depending on how fast you go, your cadence generates some noise.


The Sunny SF-T7873 folding treadmill features a console with a pretty simple interface. First of all, it has an LCD with an LED backlight that indicates time, distance, speed, incline, calories, and pulse. Speed and distance can either be imperial units (MPH, miles) or metric units (km/h, kilometers).

You can either hold on to the sensors integrated into the treadmill’s side grips or use a wireless 5.3 kHz HR chest strap transmitter for pulse monitoring. However, this accessory does not come included with the machine.

The treadmill offers several workout programs. First of all, it has the standard Manual mode, which allows you to walk or run freely, making speed and incline adjustments manually as you go. In Manual mode, you also can select countdown targets for time, distance, and calories burned.

Next, the console offers 9 (P1 – P9) pre-set workout programs. These have a “Prog” button on the console, and each program has the segment profile shown on the console dashboard. Each program adjusts both the speed of the belt and the incline of the deck. The default duration for each program is 30 minutes, but you can change this as you like.

The console also makes available an HRC program and a Body Fat Test. These, too, are accessible through the “Prog” button. The HRC program will prompt you to select a desired heart rate target and adjust the belt’s speed automatically to keep you close to the chosen HRC value.

The HRC program does not change the incline, but you can make incline adjustments automatically while running this program.

Sunny SF-T7873 Treadmill
Sunny SF-T7873 Folding Treadmill

The Body Fat Test will prompt you to input your data, such as height, weight, and age. Based on this data, it will calculate your body fat percentage. This can help you set your workout goals to the ideal body mass.

Two other notable console features are the integrated sound system and the bottle holders. The sound system consists of two speakers and an AUX input on the right side of the console. You can connect your smartphone or tablet via cable to the console to play your music through the console speakers.

The two bottle holders are placed right under the speakers. They have a relatively large diameter and should be able to accommodate any hydration bottle.

SF-T7873 Assembly and Maintenance

The treadmill comes pre-assembled and folded. You only have to unfold it, secure the two upright bars into position, add the base joint covers, adjust the belt tension (if necessary), and lubricate the deck. The manual provides clear instructions, and a set of tools also comes included.

The treadmill’s belt requires cleaning to prevent debris from being caught in the motor or the rollers for maintenance. The deck needs periodic lubrication every two months if the machine is used for more than 5 hours per week or every six months if less than 3 hours per week.


  • Sturdy construction – can support users up to 285 lbs;

    Sunny SF-T7873 Folding Treadmill
  • Folding deck, space-saving design;
  • Transport wheels;
  • Cushioned deck for a low impact ride;
  • Automatic incline (0%-15%);
  • Speed settings up to 11 MPH;
  • Speed adjustment increments of 0.1 MPH;
  • Quick keys for speed adjustment for multiple speed settings;
  • Pulse reading function;
  • Bottle trays built-in the dashboard;
  • Nine pre-set workout programs;
  • HRC program;
  • Body Fat Test program;
  • Goal settings for time, distance, and calories;
  • LED backlight on the console display;
  • Very easy to assemble;
  • Little maintenance is required.


  • It doesn’t have a tablet holder;
  • No USB charging port for your device;
  • No online connectivity.

Sunny SF-T7873 Folding Treadmill Summary

The Sunny Health & Fitness SF-T7873 is a motorized treadmill made for home use. It comes equipped with a 2.5 HP motor featuring a speed range of 0.6-11 MPH, an automatic incline system with 15 levels, and a console with multiple workout programs. It also has a folding deck.

Moreover, it’s a pretty decent machine for medium to high-intensity cardio workouts, muscle toning, stamina development, and weight loss. It’s not the most affordable treadmill in this feature range but does offer pretty decent quality for the price.

I hope you found this article helpful and informative. If you have anything you would like to share or any opinions about my website, please speak up. I look forward to your comments, questions, and the sharing of ideas.

4 thoughts on “Sunny SF-T7873 Folding Treadmill | Tackle New Fitness Challenges”

  1. Hello there! This is a great review. I have been thinking about getting a treadmill lately, especially when I cannot go outside to run. I am debating between getting either a cheap, really good one or invest in one perfect one that can last a long time. I haven’t made a decision yet, though. This treadmill looks pretty neat in that it can fold and save space. This seems like something to consider before I purchase one. Thanks for your list of pros and cons, that will help me make a better decision.

    • Hi Mike, thanks for considering the Sunny SF-T7873. You mentioned running in your comment. I would advise that you consider at least a 3.5 HP motor and a 20 x 60-inch running deck. I’d be happy to assist in your selection. Please reach out to me.

      Best regards, Robert

  2. Hi! This is an excellent review. I have been contemplating getting a treadmill recently, mainly when I can’t go outside to run. I’m bantering between getting either a modest, great one or put resources into one wonderful one that can keep going for quite a while. I haven’t settled on a choice yet, however. This treadmill glances perfect in that it can overlap and save space. This appears to be an exciting point before I buy one. A debt of gratitude is for your rundown of advantages and disadvantages that will help me settle on a superior choice.

    • Hi Herman, thanks for stopping by and sharing your thoughts with us. If I can be of any assistance during your search for a treadmill, please let me know. I’m always happy to help.

      Kind regards, Robert


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