Sole ST90 Treadmill Review – 2024

December 19, 2023
  • Sydney Kaiser
    Product Reviewer, Content Writer, Certified Personal Trainer

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Sole ST90 Treadmill Review 2024

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Sole ST90 Slat Belt Treadmill

The Sole ST90 is a premium treadmill with a unique slat belt design that rivals high-end brands.

Star Rating: 4.5
MSRP: $3,999
Overall Rating: 80
Workout Experience 8
Specs / Features 8
Dimensions / Storability 5
On-Board Workouts & Apps 8
Build Quality 8

With preloaded entertainment apps, onboard workouts, and a sled push feature, there are so many ways to train on the Sole ST90.

Sole ST90 Treadmill Review: Bottom Line

We are highly impressed that Sole has managed to include an AC motor, typically seen in treadmills at the gym, in the ST90, while still keeping it at a fair price. Commercial treadmills can be $10,000+, especially many other flat, slat-belt treadmills, so it’s nice to see the Sole ST90 is a more affordable alternative to treadmills like the Technogym Skillrun and Woodway 4Front. We really love Sole’s treadmills and know them to be extremely solid durable machines. Even though it looks strikingly similar to Peloton’s first treadmill, the Tread+ that was recalled, Sole has implemented some safety features that help to make it a safer machine than the Tread+.

In this Sole ST90 Treadmill review, I walk you through everything you can expect from this motorized, slat-belt treadmill so you can determine if it’s best for you.

Editor’s Note, 12/19/2023: This Sole ST90 review has been updated with our latest review standards. Our review process has been ongoing since we first received this treadmill 5 months ago.
What We Like
  • The motor-controlled slat belt offers a 12.5 mph max speed and 15 levels of incline and can be disengaged to control the pace of the belt yourself while offering 8 levels of incline for very versatile training.
  • The rubber slat belt and powerful AC motor make this treadmill great for running and high-intensity training, as well as capable of handling a lot of use.
  • The console features a 15.6” touch screen with onboard workouts, fitness tests, screen mirroring from your device, and app streaming from Netflix, Hulu, and Amazon Prime.
  • The motor adjusts well and the console has quick-adjustment buttons for convenient interval training.
  • This treadmill is more affordable than many other motorized slat-belt treadmills.
  • The incline and speed buttons are placed nearby on the inside of each side handle, for convenient adjusting.
Areas for Improvement
  • This treadmill and motor type aren’t as quiet as many home treadmills with DC motors.
  • The belt and deck provide shock absorption but don’t offer as much give underfoot as other treadmills, so it might not be best for those with sensitive joints.
  • The warranty for the frame and motor is only for 5 years, while Sole offers lifetime warranties on other models.

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Treadmills Are Our Specialty and We’ve Got the Miles to Prove It

We spend a lot of time on treadmills. A big chunk of the treadmills we’ve tested is from Sole. We’re very familiar with how they feel, perform, and function overall. We’re excited to see that Sole has branched out in their lineup to include a flat, slat-belt treadmill. In our testing of the ST90, we compared it to other models from Sole like the F80 and F85, as well as other slat-belt treadmills like the TrueForm Trainer and AssaultRunner Elite, as well as our previous experience using the Peloton Tread+.

Sole ST90 Treadmill Review Video


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Sole ST90 vs Similar Treadmills

Want to see how the Sole ST90 compares to the competition? We have the data compiled in one helpful chart to make things easy for you.

Treadmill Sole ST90 NordicTrack X22i Peloton Tread Horizon 7.8 AT Sole TT8
Price (MSRP) $3,499

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$3,499

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$2,995

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$2,699

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$2,799

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Star Rating 4.5 5 4.5 4.7 4.6
Bottom Line The flat slat-belt, powerful motor, and streaming from Netflix make this treadmill very versatile for home use. The ultimate treadmill with an insane 40% incline and lovely 22″ touch screen to follow along with iFit This premium, non-folding treadmill offers streaming of Peloton’s workout classes directly from the touch screen. Horizon’s premium model that features a quick-adjusting motor, roller dials, and Sprint 8 programming for the ultimate HIIT training treadmill. This non-folding treadmill is rated for home and studio gym use. It features a spacious deck, incline and decline, and a touch screen for streaming Netflix.
Ratings Sole ST90 NordicTrack X22i Peloton Tread Horizon 7.8 AT Sole TT8
Overall Rating 80 90 75 79 74
Workout Experience 8 10 8 8 8
Specs / Features 8 10 8 8 7
Dimensions / Storability 5 5 6 8 5
On-Board Workouts
& Apps
8 10 8 7 8
Build Quality 8 9 8 7 8
Paid Programming – Cost N/A iFIT – $39/month Peloton All-Access Membership – $44/month N/A N/A
# of Onboard Workouts 17 2 1 10 17
Netflix / 3rd Party Apps YouTube, Netflix, Prime Video, Disney+, Max, Peacock, Hulu, Spotify, ESPN, CNN, Audible, Kinomap N/A Netflix, Disney+, Max, YouTube TV, NBA N/A YouTube, Netflix, Prime Video, Disney+, Max, Peacock, Hulu, Spotify, ESPN, CNN, Audible, Kinomap
Display 15.6″ touchscreen 22″ HD touchscreen 23.8″ touchscreen 9.3″ TFT LCD screen, 16-digit LED 15.6″ HD touchscreen
Dimensions (In Use) 82.5″L x 38″W x 66″H 70” L x 39” W x 72.5” H 68″ L x 33″ W x 62″ H 76″ L x 37″ W x 64″ H 82.5″L x 38″W x 66″H
Dimensions (Folded) N/A N/A N/A 42″ L x 37″ W x 71″ H N/A
Treadmill Type Non Folding, Slat Belt Non-folding Non-folding Folding Non-folding
Treadmill Weight 326 lbs 417 lbs (in box) 290 lbs 330 lbs 326 lbs
Weight Capacity 400 lbs 300 lbs 300 lbs 375 lbs 400 lbs
Running Surface 20″ x 60″ 22″ x 60″ 20″ x 59″ 22″ x 60″ 22″ x 60″
Deck Height (Step Up) 10″ Coming Soon! 8″ 8.75″ 8″
Deck Height At Highest Incline Coming Soon! Coming Soon! Coming Soon! Coming Soon! Coming Soon!
Ceiling Height Required(6’ Tall Runner) Coming Soon! Coming Soon! Coming Soon! Coming Soon! Coming Soon!
Motor Size 2.0 HP AC 4.0 CHP 3.0 CHP 4.0 CHP 4.0 CHP
Incline/Decline 15 incline levels -6% to 40% 0 to 12.5% 0 to 15% 15 incline levels, 6 decline levels
Min / Max Speed 0 to 12 mph 0 to 12 mph 0 to 12.5 mph 0 to 12 mph 0 to 12 mph
Frame steel steel Carbon steel steel steel
Roller Size 7.44″ 2.5″ 60mm/46mm tapered 3″
Warranty lifetime frame, lifetime motor, 3-year deck, 3-year parts, 1-year wear parts, 1-year labor, 90-day cosmetic items 10-year frame, 2-year parts, 1-year labor 5-years frame, 3-years drive motor, 3-years belt, 1-year touch screen, 1-year most original components lifetime frame, lifetime motor, 5-year parts, 2-year labor lifetime frame & motor, 3-year deck, parts, & wear items, 1-year labor, 90-day cosmetic items; light commercial: 2-year parts, 1-year labor
Connectivity Bluetooth, WiFi, Sole+, Garmin Bluetooth, WiFi Bluetooth, Apple Watch, Garmin, and Strava Bluetooth, third-party apps (Peloton, Nike, Zwift, etc) Bluetooth, WiFi, Sole +, Garmin
Heart Rate Sensors EKG pulse grips, compatible with Bluetooth HR monitors compatible with Bluetooth HR monitors Bluetooth, ANT+ compatible with Bluetooth HR monitors, EKG pulse grips EKG pulse grips, compatible with Bluetooth HR monitors
Additional Features wireless charging, Bluetooth speakers, device rack, cup holders, small item compartments, fan, speed/incline switches, manual training mode AutoAdjust, AutoBreeze fan, dual 3″ digitally-amplified speakers, ActivePulse, SpaceSaver Easy Lift Assist, OneTouch controls, Google Maps Workout Technology, Integrated Sled Push, Sled Push Bar, integrated cup holders, soft cushioning Auto-Incline, Lanebreak, tray, cupholders, roller knobs & jump buttons, red centerline, 4 speakers, headphone jack, USB-C charging port., front-facing camera, microphone, Stacks, Leaderboard, heart rate zones, body activity tracking device racks, audio jack, Bluetooth speakers, interval keys, energy saver mode, fan, media controls, storage tray, QuickDial controls, USB charging, cup holders, 3-zone cushioning wireless charging, Bluetooth speakers, device rack, fan, light commercial grade, cup holders, small item compartment, incline/decline motor, speed/incline switches

In-depth Sole ST90 Treadmill Review: Testing & Analysis


Dimensions/Storability

The Sole ST90 has dimensions of 82.5″ L x 38″ W x 66″ H. We don’t recommend moving it often though because it’s so heavy. It also doesn’t fold up like other slat-belt treadmills. The ST90 requires a designated space to use in your home. Unfortunately, there isn’t a handle built under the back end to make lifting a little more convenient, so this treadmill is not only heavy but hard to move.

The Sole ST90 has a step-up height of 10 inches. This height is not too difficult to negotiate. This gives the ST90 a recommended ceiling height of 8.5’. Please note that we have accounted for more than enough space for a 6’ tall runner to train. If you are much taller or shorter, your required ceiling height may be different.

Sole’s other treadmills have pretty low deck heights, like the F63, F80, and F85. Due to its slat belt and very large rollers, the deck height is higher on the Sole ST90. At a 0% grade, it measures to be about 10” high. When considering your home space and ceiling height, it’s important to factor in the deck height, incline range, and height to determine if the space has a high enough ceiling.

Onboard Workouts & Apps

Preprogrammed Workouts, Apps and Features

One thing that we love about Sole Fitness is that they don’t require you to purchase a subscription membership to use the screen content on their equipment. The Sole ST90 includes a lot of workouts and content options that are available to use without an additional subscription.

For guided training, the ST90 includes 10 preprogrammed workout programs. These include manual mode where you can just hop on and go, hill, fat burn, cardio, strength, HIIT, 5k run, 10k run, heart rate, and custom mode.

Sole ST90 Treadmill Workout Programs

In custom mode, you can create your own workouts and save them in the “Templates” tab which is found under “All Programs” on the home screen.

In addition to the workout programs, there are also fitness tests you can take like Air Force, Army, and Marine Corps.

A really nice addition to the content features is the inclusion of 12 preloaded streaming apps. These apps are Netflix, Hulu, Youtube, Amazon Prime, Disney+, Max, Peacock, Spotify, ESPN, CNN, Audible, and Kinomap. What we really appreciate is that these apps are available to use without an additional fee, like other fitness platforms on fitness equipment.

Sole ST90 Treadmill  Preloaded Streaming Apps

All you need to do is log into your respective account for each app and start watching while you workout on the Sole ST90 Treadmill.

Another cool feature is the ability to screen-mirror your phone to the treadmill’s touch screen. This is nice if you want to follow along to an instructor-led workout video or stream something that isn’t available on one of the 12 apps. We did notice that this feature doesn’t seem to currently work with Android devices. I was able to screen mirror my iPhone, though.

The ST90 also pairs with the Sole+ App like other Sole equipment. The Sole+ is helpful for getting a profile set up and saved onto the ST90. I recommend doing this and creating your own profile, so you don’t have to log into the streaming apps every time you use the treadmill if you were to use guest mode. Having a profile also saves your previous workout history and saved custom workouts, too.

Console

If you’ve taken a look at the new Sole F80 and F85, you’ll notice that the ST90 has the same console. It also has the same size screen as the F85. The 15.6” touchscreen is centered on the console and is bright, clear, and easy to use.

The screen doesn’t adjust, so you can’t tilt it up or pivot it to either side of the treadmill. The screen is positioned a little closer and easier to reach than the F80 and F85 treadmills so I don’t mind that it isn’t adjustable. It’s at a good angle so all our reviewers ranging from 5’1” to 6’5” can see it, well.

Sole ST90 Treadmill Console

I like that there are quick touch adjustment buttons on either side of the screen.

The right side buttons are for speed, and the left is for incline. Like other Sole Treadmills, the increments skip some levels like 6 mph and 4% incline. This makes it a little hard to quickly adjust the treadmill, but the two side buttons allow you to adjust the treadmill by 0.1-speed increments on the right and 1% incline increments on the left. You have to hold these down to adjust between the increments quickly and there is a slight delay when holding it down before the treadmill begins adjusting. You can also just press these buttons.

Sole ST90 Treadmill Incline Button

These side buttons remind me of the roller adjustments on the current Peloton Tread.

Below the screen are front-facing speakers that go loud. My only issue with them is that there isn’t an adjustment button on the console to adjust the noise level. Instead, you have to select the small speaker icon at the top right of the screen to adjust the volume. This is hard to do while you’re running. In a future update, we’d like to see a volume button on the console below the screen. The speakers are Bluetooth-enabled to play content from your phone and they pair with Bluetooth headphones.

Sole ST90 Treadmill Fans

There is a button to adjust the fans on the console.

The only problem is that the fans aren’t very powerful or effective at cooling you off. The air seems to point more to the sides of the treadmill than at you and there is only one setting for the airflow.

Sole ST90  wireless charger

We really like the wireless charging pad below the screen.

This is compatible with phones that have wireless charging available. I just have to take the case off my phone to use it because my case isn’t compatible. The pad also serves as a place to store your phone, too. There is also a tablet holder up top that’s adjustable to hold your phone or larger tablet. It has a bottom and top lip to hold your device in place. Its height is good for most people, too.

There are also 4 pockets on either side of the console. 2 are for your water bottles and the other two are shallower and for smaller items like keys or earbuds.

Overall, the console is pretty streamlined and easy to use. We did notice the screen and console shake a little bit while using the ST90. This is more noticeable while walking than running, but it isn’t distracting while working out.

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Build Quality

Even though the Sole ST90 is a slat-belt treadmill that varies pretty greatly from Sole’s other treadmills, it is still a sturdy, heavy-duty machine. The Sole ST90 slat belt treadmill has a 330 lb weight limit, so users up to that limit should be able to use it. It also weighs a whopping 375 lbs, so it’s not ideal for an upstairs apartment.

Frame

The frame is where we are getting some flashbacks of the now recalled, Peloton Tread+.

Sole ST90 Treadmill Frame

It also shares the same “Z-shaped” frame as the Sole F85 and F80.

The deck, uprights, and handles on the Sole ST90 have a clean, simple look. The frame under the deck is made out of steel with front transportation wheels when you need to move the ST90. Along with the steel frame are steel uprights that extend up to hold the console, screen, and handles. As I mentioned there is a little bit of shake in the console when using the ST90. Its shake is similar to the new Peloton Tread which shakes at higher speeds.

The handles are well within reach. The side handles extend on either side of the deck and the front handle is one bar that is positioned just in front of the console. I really like the front handle because it’s easy to reach and provides a lot of surface to grab when needed. There are also two pulse grips built into the handle that read your heart rate on the screen when holding them. They’re a little thick to wrap my fingers around, but I can place my palms on them. You can also connect a compatible heart rate monitor such as a Garmin Watch to read your heart rate on the screen.

Motor

Sole ST90 Treadmill Matt Running

I’m really excited about the 2.0 HP AC motor.

AC motors are known to perform better than DC motors. They are also great for handling a lot of use. Since they’re commonly found on treadmills in public gyms that get used by several people every day, the ST90 should work well for multi-user households as well as long-distance runners. We found the motor to work well for us. It also adjusts the speed and incline faster than other Sole Treadmills with DC motors. This makes the ST90 better for interval training.

One thing to keep in mind with AC motors is that they aren’t as quiet as most DC motors found on home treadmills. We found the ST90’s motor to be pretty loud like the original Peloton Tread+ which had a 2.0 HP AC motor, too. The Sole ST90 sounds more similar to other treadmills with AC motors that we’ve tested than treadmills with DC motors. I would keep this in mind if are looking for a quiet treadmill.

The Sole ST90 Treadmill goes up to 12.5 mph and has 15 levels of incline. I really like this speed and incline range. It makes for intense training options for most people.

Sole ST90 Treadmill Matt Incline

The incline is also pretty steep to offer plenty of challenge, too.

Deck

Another factor that is unique to Sole is the slat-belt deck. It’s flat and motorized like the Peloton Tread+, high-end Technogym SkillRun, and Woodway 4Front. The latter two are made for commercial use and are found in training facilities.

The deck provides enough space for most running strides with its 60” in length and 20” in width. It isn’t quite as narrow as most curved, manual slat belts, but it helps to keep you in alignment and in a linear pattern while running.

Sole ST90 Treadmill Slat Belt

The ST90’s slat belt features individual slats that are rubberized to absorb the shock from each footfall.

As far as functionality and design it is similar to other flat, motorized slat belts and curved, manual treadmills.

As far as how the Sole ST90 slat belt treadmill feels to use compared to other treadmills, it feels harder to run on than other motorized treadmills like the F80 and F85 for instance. The big reason for this is the deck cushioning. As I mentioned, the rubber slats provide a lot of shock absorption but you don’t get the same amount of give in the deck or bounce (think that slight spring in your step feeling) that most belted treadmills provide. Sole treadmills overall have firmer deck cushioning and less give, but the ST90 has the least amount of give.

It also feels different to run on than curved, manual treadmills like the TrueForms and AssaultRunners. These treadmills are firm underfoot. The ST90 feels firmer. When I’m running on it, it makes me have to work a bit harder than when I’m running on a really forgiving deck. I’ve also noticed that similar to the TrueForm Treadmills which have shallow-curved decks that can be hard to run on, especially for heel strikers, the ST90 is kind of the same for me. I’m a heel striker, like most people, and I’ve noticed that I get less fatigued on the ST90 if I run with more of a forefoot and midfoot strike, which is the same when I run on TrueForms.

I think from a workout and running standpoint if you want to train hard, whether for a good workout or to potentially make your runs outside feel a little easier, the ST90 can help with that. It feels harder than running outside. Some could equate it to running in sand, but I think it feels kind of like running on a track at your local high school or college.

Sole ST90 Treadmill Motor Disengaged

A really cool feature of the Sole ST90 is that the belt can be disengaged to be manually powered by your feet like curved, manual treadmills.

This is accessed on the screen in “Free Mode”. This gives you the option to keep up with the motorized set pace or use the belt without being propelled by the motor. You can also use 8 levels of incline with this feature. This is beneficial for changing up the intensity of your workouts by adding a lot of versatility. You can also face the rear and use this feature to walk backward, as pictured above.

Warranty

The warranties that Sole includes with the ST90 are less extensive than what they normally offer. The frame and motor have 5-year warranties, the deck and electronics have 3-year warranties, and there’s a 1-year warranty for parts and labor. We would like to see Sole extend the length of the warranty for the frame and motor.


Should You Buy the Sole ST90

There are a lot of features on the ST90 Treadmill that are different than other treadmills from Sole that we’ve tested. The powerful AC motor, flat-slat belt, and sleek design make this a great treadmill for high-intensity training. It feels more difficult to run on than other motorized standard-belt treadmills due to the deck cushioning.

You can also use the “free mode” which allows the motor to be disengaged to control the pace of the belt with your feet. The ST90 is one of the most versatile treadmills that we’ve tested and this makes it a very effective tool for cardio-conditioning. We also love that it features a 15.6” touch screen to offer onboard workouts and streaming from apps like Netflix.

If you’re looking for a treadmill to take your training and fitness level up a notch (or a few), we recommend checking this one out.

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Sole ST90 Treadmill Q&A / FAQ

How much does the ST90 treadmill weigh?

The Sole ST90 weighs 326 lbs. This heavy, non-folding treadmill works best with a permanent location, so you don’t have to move it around often or at all.

What is the warranty on the Sole ST90?

The Sole ST90 is covered by a 5-year warranty on the frame and motor. The deck and parts are covered for 3 years. The wear items and labor are covered by a 1-year warranty. Cosmetic items are covered for 90 days. Because the ST90 is a residential treadmill, it is not covered for any commercial use.

Are slat treadmills better than belted treadmills?

Slat belt treadmills are not innately better than treadmills with traditional belts. However, some runners may prefer the cushioning and added challenge of a slat belt treadmill. The Sole ST90 has a manual training mode that is not often found on non-slat belt treadmills. Slat belt treadmills tend to be more expensive than their counterparts. In the end, it comes down to user preference.

Is your Sole ST90 Treadmill review a paid review?

No! Our Sole ST90 review is not a paid review. Instead, we earn an affiliate commission when you use the links scattered throughout our reviews and website to make a purchase. Using these links to purchase a product does not incur any additional cost to you. It supports our review process, so we can continue to provide you with the best information possible.

The products we review are typically sent (for free) from brands. We work with so many brands, like NordicTrack, Sole, ProForm, Horizon, etc, that we are impartial to which brand you decide on. Our review process and results are all our own. We are not influenced by brands in how we rate or test their equipment. We are experts in the field and strive to accurately reflect all the products we review.

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About the Author

Sydney Kaiser, ISSA-CPT, ISSA Nutritionist Certification
Sydney is a certified fitness instructor, personal trainer, and sports nutritionist who combines her passion for fitness, health, and wellness with her passion for writing. After graduating from UC Riverside with a Master of Fine Arts in Creative Writing, she began teaching indoor cycling and Lagree Fitness group fitness classes to people of all ages and abilities. Raised in Central Michigan, Sydney grew up training and competing on the Arabian Horse Association circuit through both Regional and National levels in Dressage and Sport Horse classes. In college, Sydney went on to compete at the collegiate level as a Division 1 equestrian athlete. Here at TRG, Sydney relies on her extensive background in fitness when reviewing and recommending all kinds of fitness, recovery, and health-related products.

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