KingSmith MX16 vs X21 | Which Foldable Treadmill Should You Choose?

KingSmith has become particularly well known for solving one of the biggest problems with home treadmills: storage. Instead of leaving a large treadmill permanently occupying your room, models such as the KingSmith X21 and MX16 can fold into a much smaller footprint.

But while these two treadmills share KingSmith's space-saving philosophy, they're designed for noticeably different levels of training. The KingSmith X21 focuses on compactness and everyday walking, jogging, and moderate running, while the KingSmith MX16 increases speed, running area, and user capacity for more demanding workouts.

For UAE buyers comparing the KingSmith MX16 vs X21, the decision shouldn't come down to appearance alone. Maximum speed, belt dimensions, user weight, machine size, and the type of exercise you actually plan to do matter considerably more.

Here's a detailed comparison to help you understand the differences before choosing a KingSmith foldable treadmill for your apartment, villa, or home gym.

KingSmith MX16 vs X21: Quick Comparison

The easiest way to understand these two machines is to compare their main specifications side by side.

The numbers reveal the biggest difference immediately. The MX16 is the more performance-oriented machine, while the X21 remains lighter and more compact.

What Is the KingSmith X21?

The KingSmith WalkingPad X21 is one of the models that helped establish KingSmith's vertical-fold treadmill concept. Its double-fold construction allows the running deck to fold so the treadmill can occupy considerably less floor space when not being used.

The X21 offers speeds from approximately 1 to 12 km/h, making it suitable for walking, brisk walking, jogging and moderate running. Its running area measures approximately 1210 × 460 mm, while maximum user capacity is listed at 110 kg.

It also includes KingSmith's SpeedDial-style control system and compatibility with the KS Fit app. Instead of building the treadmill around a huge console, KingSmith keeps the design relatively minimal and home-friendly.

For someone who wants a proper cardio machine but doesn't want a traditional full-size treadmill permanently dominating the room, the X21 remains an interesting option.

What Is the KingSmith MX16?

The KingSmith MX16 takes the same general space-saving idea and moves it toward more serious running performance. Its maximum speed increases to approximately 16 km/h, giving users considerably more headroom for faster sessions.

The running area also increases to approximately 1320 × 500 mm, while maximum user capacity rises to approximately 136 kg. These changes make the MX16 more suitable for users who want their compact treadmill to feel closer to a conventional running treadmill.

The MX16 remains foldable and uses built-in transport wheels to help with movement and storage. It also supports the KS Fit app and uses KingSmith's SpeedDial control system.

So although both treadmills target space-conscious homes, the MX16 places much more emphasis on actual running capability.

MX16 vs X21: Maximum Speed

This is one of the most important differences.

The KingSmith X21 reaches approximately 12 km/h, while the KingSmith MX16 reaches approximately 16 km/h.

A 12 km/h maximum is enough for walking, jogging, and moderate running for many home users. If your workouts mainly involve daily steps, brisk walking, and steady cardio, you may never need more speed than the X21 provides.

The MX16's 16 km/h maximum gives stronger runners considerably more room to progress. It also makes interval workouts easier because you aren't approaching the machine's maximum speed every time you want to run faster.

Is 12 km/h Fast Enough?

For many users, yes. A speed of 12 km/h corresponds to a pace of approximately 5 minutes per kilometre, which is already running rather than casual jogging.

Someone primarily buying a treadmill for walking, improving daily activity, moderate jogging, or general cardiovascular exercise may therefore find the X21's speed perfectly adequate.

However, stronger runners or people who want faster interval sessions can reach that ceiling relatively quickly. That's where the additional performance of the MX16 becomes valuable.

You should buy according to the speed you expect to use in the future, not only the speed you're comfortable with today.

Is 16 km/h Better for Running?

A 16 km/h maximum corresponds to approximately 3:45 minutes per kilometre at the machine's top speed. That gives the MX16 considerably more performance headroom than the X21.

Most users won't run continuously at 16 km/h, but having additional speed available can be useful for intervals, progression and shorter faster efforts.

The benefit isn't simply about reaching the maximum number. A higher ceiling means a regular running pace can sit further below the treadmill's maximum capability.

For buyers who genuinely intend to run regularly, the MX16's speed range is therefore an important advantage.

MX16 vs X21: Running Belt Size

Speed isn't the only major upgrade.

The X21 provides a running area of approximately 1210 × 460 mm, while the MX16 increases this to approximately 1320 × 500 mm.

That gives the MX16 both additional length and width. Those extra millimetres can make a noticeable difference when your stride becomes longer at higher running speeds.

Walking generally requires less running-deck space because stride length and movement are more controlled. Faster running places greater value on a longer and wider belt.

This is one reason the MX16 makes more sense as the performance-focused option rather than simply being a faster X21.

Which Is Better for Taller Users?

Height alone doesn't determine treadmill suitability because people of the same height can have different stride patterns. Running speed also influences how much usable deck space feels comfortable.

However, taller users and runners with longer strides will generally appreciate the MX16's 1320 mm deck length and 500 mm width compared with the X21's 1210 × 460 mm area.

The X21 can still work well for many users, particularly for walking and moderate jogging. But if you already know you prefer more space around your feet while running, the MX16 provides the larger platform.

When possible, consider both your body size and intended workout speed before choosing.

MX16 vs X21: User Weight Capacity

The difference in maximum user capacity is also significant.

The KingSmith X21 is rated for approximately 110 kg, while the MX16 increases maximum user weight to approximately 136 kg.

That 26 kg difference makes the MX16 suitable for a broader range of users and also reflects its more substantial overall construction.

Never choose a treadmill where your body weight exceeds the manufacturer's stated maximum. User capacity is a safety and equipment specification, not simply a marketing number.

If multiple family members will share the treadmill, choose according to the heaviest intended user.

MX16 vs X21: Machine Weight

The additional capability of the MX16 comes with a trade-off: the machine itself is heavier.

The X21 weighs approximately 37 kg, while the MX16 weighs approximately 47 kg.

A 10 kg difference matters if you're frequently moving the treadmill between rooms. The X21's lighter construction can therefore be an advantage for users who prioritize easy repositioning.

Both machines use transport wheels to make movement easier, but neither should be treated like an ultra-light under-desk walking pad.

MX16 vs X21: Folding and Storage

Storage is where both models become particularly interesting for UAE homes.

KingSmith's vertical-fold concept allows the treadmill deck to fold so the machine can be stored in a much smaller area than a conventional treadmill.

The X21's folded dimensions are approximately 1007 × 711 × 225 mm, creating a relatively slim package for a treadmill capable of running speeds.

The MX16 folds to approximately 259 × 774 × 1024 mm, creating an upright storage configuration despite its larger running deck.

Both are designed around the same fundamental idea: use the treadmill when you need it and reclaim your room when you're finished.

Which Is Better for Apartments?

For a Dubai apartment where every centimetre matters, the X21 remains very attractive.

It's lighter, slightly smaller, and provides enough speed for walking, jogging, and moderate running. Someone who mainly wants convenient daily cardio may not need the additional size and capability of the MX16.

The MX16 is more attractive when you live in an apartment but don't want to compromise as much on running performance. You still get foldable storage while gaining a larger belt and higher maximum speed.

So apartment living doesn't automatically mean X21. Your training style still matters.

Which Is Better for a Villa Home Gym?

If you have a dedicated home gym in a villa, storage may be less important than performance.

In that situation, the MX16's 16 km/h speed, larger 1320 × 500 mm deck, and 136 kg capacity make it the more capable training machine of the two.

The folding system remains useful because you can free floor space for dumbbell, bench, mobility, or functional workouts when the treadmill isn't being used.

The X21 can still make sense for a secondary cardio area or for users whose workouts focus more on walking and moderate jogging.

MX16 vs X21: Incline

Neither treadmill should be purchased specifically for incline training.

The KingSmith X21 does not provide incline, and the MX16 is also built primarily around flat walking and running rather than powered incline training.

This is an important distinction because traditional treadmills from brands such as NordicTrack and ProForm may offer automatic incline and, on selected models, decline.

If hill training is one of your main requirements, compare dedicated incline treadmills before choosing either KingSmith model.

If compact folding and storage matter more than incline, the KingSmith approach becomes much more attractive.

MX16 vs X21: SpeedDial Control

Both treadmills use KingSmith's SpeedDial approach rather than relying on a traditional large treadmill console.

The dial allows users to control treadmill speed while maintaining the clean, minimalist design associated with the KingSmith vertical-fold range.

This is particularly useful in modern homes where buyers don't necessarily want a large commercial-looking cardio machine in the middle of the room.

The control system also helps maintain the compact structure required for folding and storage.

MX16 vs X21: KS Fit App

Both models work with the KS Fit app, allowing users to connect their treadmill to a smartphone and track workout information.

The app can help record exercise data and create a more connected experience than simply looking at the treadmill display.

KingSmith also lists Apple Watch integration through KS Fit for compatible setups, allowing heart-rate information to become part of the connected workout experience.

If you're having difficulty connecting your machine, Athletix's KingSmith WalkingPad KS Fit App Guide is a useful related resource.

Do the MX16 and X21 Have Remote Controls?

No traditional remote controller is listed for either model.

Instead, speed adjustment is handled through the SpeedDial and compatible app controls, depending on the model's operating setup.

This distinguishes them from some older or walking-focused KingSmith products that rely more heavily on a handheld remote.

For users who dislike constantly searching for a small treadmill remote, integrated SpeedDial control can actually be a convenient design choice.

MX16 vs X21: Cushioning

Both models use cushioning designed to reduce the harshness of repeated treadmill foot strikes compared with running directly on a rigid surface.

KingSmith's current information describes cushioning systems across its newer foldable treadmill range, with the MX16 specifically promoted with SoftStep cushioning.

Cushioning can improve comfort, but don't choose a treadmill based on cushioning terminology alone. Your footwear, running form, speed, and training volume also influence how a workout feels.

The larger MX16 deck may additionally contribute to confidence during faster running because there is more usable space available.

MX16 vs X21: Motor

Both machines use brushless motor technology, but the MX16 is designed around the higher performance demands created by its faster 16 km/h maximum speed and larger running platform.

Current KingSmith regional specifications list the MX16 with a 4.5 HP brushless motor, while current X21 regional specifications list a 3.75 HP brushless motor.

Motor specifications can sometimes vary between regional versions or be presented differently across markets, so buyers should always verify the specifications of the exact UAE unit being purchased.

The practical takeaway is simpler: the MX16 is positioned above the X21 for faster and more demanding running.

Which Is Quieter?

Both models use brushless motor systems and are designed for home environments, but actual perceived noise depends on much more than the motor.

Your running speed, body weight, foot strike, flooring, and whether you live above another apartment can all affect how much sound and vibration reaches neighbouring rooms.

Walking at 4 km/h will generally create a very different experience from running at 14–16 km/h, regardless of the treadmill's advertised motor noise.

For apartment use, a suitable treadmill mat can also help protect the floor and manage some vibration.

Which Is Better for Walking?

If your main goal is simply increasing your daily step count, the X21 provides more performance than many people actually need.

Its 1–12 km/h range means you can comfortably move from casual walking through brisk walking and into jogging or running without replacing the treadmill.

The MX16 can obviously perform the same walking workouts, but you're paying for additional running capability that you may never use.

For a walking-dominant user, the X21 can therefore be the more sensible match.

Which Is Better for Jogging?

Both machines are suitable for jogging.

The X21's 12 km/h maximum leaves enough speed for a broad range of jogging workouts, while the MX16 provides additional room if your fitness improves and your jogging gradually develops into faster running.

The MX16's larger running surface can also feel more comfortable as pace increases.

If you're unsure how your training will develop, think about whether you're likely to become a regular runner over the next few years.

Which Is Better for Running?

This is where the MX16 separates itself.

Its 16 km/h maximum speed, 1320 × 500 mm running area, and 136 kg user capacity create a stronger overall specification for regular running.

The X21 can certainly be used for running, but its 12 km/h maximum and smaller 1210 × 460 mm deck position it more naturally for walking, jogging, and moderate running.

For someone specifically searching for a compact running treadmill, the MX16 provides considerably more performance headroom.

Which Is Better for Interval Training?

Interval training frequently involves alternating between slower recovery periods and faster running efforts.

The X21 can handle moderate intervals within its 12 km/h speed ceiling, which may be perfectly sufficient for beginners and recreational users.

The MX16's 16 km/h maximum creates a much wider range between recovery and high-speed intervals.

If interval running is already part of your training program, that additional speed range can make the MX16 much more useful.

Can You Use the X21 Under a Desk?

The X21 shouldn't be confused with KingSmith's traditional low-profile under-desk WalkingPads.

Its fixed upright control structure and running-focused design make it different from models intended specifically to slide beneath a standing desk during work.

If your primary goal is walking while typing or attending meetings, compare dedicated KingSmith walking-focused models such as the MX8 or other compatible under-desk designs.

The X21 is better viewed as a compact foldable treadmill rather than simply an office walking pad.

What About the KingSmith MX8 and MX10?

The KingSmith range doesn't begin with the X21.

The MX8 sits toward the compact walking end of KingSmith's newer vertical-fold range, with a lower maximum speed aimed more toward walking and lighter exercise.

The MX10 steps up from that level and is another option for users prioritizing compact home cardio without requiring the MX16's full running capability.

KingSmith's current range therefore gives buyers several performance levels rather than forcing everyone into the same treadmill.

What About the KingSmith X214 and X218?

KingSmith also offers higher-performance variations around the X-series concept.

The X214 increases maximum speed beyond the X21 and adds a different support configuration, while the X218 moves further toward higher-speed treadmill performance.

The X218 is currently positioned at up to approximately 18 km/h, making it relevant to users who want more speed than either the X21 or MX16 provides.

This creates a useful progression:

MX8 → MX10 → X21 → X214 → MX16 → X218

The right model depends on how much running capability you actually need.

MX16 vs X21 for Beginners

Beginners shouldn't automatically buy the slower treadmill.

Instead, think about what type of training you're beginning.

If you're starting with walking and gradually progressing toward jogging, the X21 provides plenty of room to develop while remaining compact and relatively light.

If your long-term goal is regular running, buying the MX16 from the beginning may prevent you from outgrowing the treadmill as your fitness improves.

Future training matters almost as much as current fitness.

MX16 vs X21 for Experienced Runners

Experienced runners are more likely to notice the MX16's advantages.

The additional speed, longer deck, wider running area, and higher user capacity create a treadmill better suited to sustained running and faster workouts.

A 12 km/h maximum can become restrictive for someone accustomed to faster outdoor running or treadmill intervals.

For that reason, experienced runners comparing only these two models will likely find the MX16 specifications more aligned with their training requirements.

MX16 vs X21 for Small Spaces

If your biggest concern is storage, both machines are impressive compared with traditional treadmills.

The X21 has an advantage in machine weight and compactness, weighing approximately 37 kg compared with the MX16's approximately 47 kg.

The MX16 requires slightly more space but gives you considerably more running capability in return.

Measure the room and planned storage location before ordering rather than relying on photos, because compact in a product image doesn't necessarily mean compact in your specific apartment.

MX16 vs X21: Which Offers Better Long-Term Flexibility?

Think about how your fitness may change over the next three to five years.

Someone currently walking at 5 km/h may eventually progress into jogging but still never require more than the X21's 12 km/h maximum.

Someone already jogging regularly may eventually want faster intervals and longer running sessions, making the MX16's additional performance more useful.

Buying a treadmill slightly above your current ability can make sense, but buying capabilities you'll never use simply increases your cost.

KingSmith MX16 vs X21: Main Differences

The key differences can be summarized quite simply.

The X21 is lighter, more compact, and provides enough speed for walking, jogging, and moderate running.

The MX16 increases maximum speed from 12 to 16 km/h, enlarges the running area from approximately 1210 × 460 mm to 1320 × 500 mm, and raises maximum user capacity from 110 to 136 kg.

Those aren't cosmetic upgrades. They're meaningful performance differences.

The choice therefore comes down largely to whether you prioritize maximum compactness or stronger running capability.

Who Is the KingSmith X21 Best For?

The X21 is particularly suitable for users who want a compact treadmill for regular home cardio but don't need high-speed running.

It makes sense for walking, brisk walking, jogging, moderate running, and general fitness sessions in apartments and multipurpose rooms.

Its lower machine weight can also make it easier to reposition compared with the heavier MX16.

For many everyday users, the X21 provides a useful balance between performance and storage efficiency.

Who Is the KingSmith MX16 Best For?

The MX16 is better suited to users who want a compact treadmill without giving up as much traditional treadmill performance.

Its 16 km/h maximum speed and larger running area make it more appropriate for regular runners, interval training, and users with longer strides.

The higher 136 kg user capacity also makes it suitable for a broader range of users.

If you're building a serious home cardio setup but still need the treadmill to fold away, the MX16 deserves particular attention.

Where to Buy KingSmith MX16 and X21 in UAE

Athletix carries a broad selection of KingSmith WalkingPads and foldable treadmills for customers across Dubai, Abu Dhabi, Sharjah and the UAE.

The current KingSmith range includes compact walking models alongside higher-performance machines such as the X21, MX16/MX16+, X214 and X218, depending on stock availability.

Before ordering, check the current product page for UAE pricing, stock status, and the exact regional specification of the machine being sold.

This is particularly important because KingSmith specifications and model variants can differ between markets.

Final Thoughts

The KingSmith MX16 vs X21 comparison comes down to a fairly clear trade-off: compact everyday cardio versus stronger running performance.

The X21 gives you a 12 km/h maximum speed, 1210 × 460 mm running area and 110 kg user capacity in a lightweight, highly compact foldable design.

For walking, jogging, general fitness, and moderate running, that's already plenty of a treadmill for many UAE home users.

The MX16 steps things up with a 16 km/h maximum speed, 1320 × 500 mm running area, and 136 kg user capacity.

Those upgrades make a meaningful difference if you run regularly, perform faster intervals, have a longer stride, or simply want more performance headroom for future training.

At the same time, the MX16 is heavier at approximately 47 kg compared with the X21's approximately 37 kg.

So don't automatically assume that more performance is always what you need.

If your workouts are primarily walking + jogging + moderate running, the X21's combination of compactness and capability can make a lot of sense.

If your workouts are more likely to include regular running + faster intervals + higher speeds, the MX16 provides substantially more room to progress.

Whichever model you choose, one thing remains the same: both demonstrate why KingSmith has become so closely associated with space-saving home cardio equipment.

Instead of permanently sacrificing a large section of your apartment or home gym to a conventional treadmill, you can finish your workout, fold the treadmill, and reclaim much of that space.

For UAE buyers, explore the Athletix KingSmith Treadmills & WalkingPads collection to compare the MX16, X21, and other KingSmith models for apartments, villas, home offices, and dedicated home gyms.

FAQs

What is the main difference between KingSmith MX16 and X21?

The biggest differences are speed, running area, and user capacity. The MX16 reaches approximately 16 km/h with a 1320 × 500 mm deck and 136 kg capacity.

The X21 reaches approximately 12 km/h with a 1210 × 460 mm deck and 110 kg maximum user capacity.

Is the KingSmith MX16 faster than the X21?

Yes. The MX16 reaches approximately 16 km/h compared with approximately 12 km/h for the X21.

That makes the MX16 better suited to faster running and interval workouts.

Is the X21 good for running?

Yes. A 12 km/h maximum allows walking, jogging, and moderate running.

However, stronger runners may prefer the additional speed and larger deck offered by the MX16.

Does the KingSmith MX16 have a bigger running belt?

Yes. The MX16 provides approximately 1320 × 500 mm of running area compared with approximately 1210 × 460 mm on the X21.

The additional length and width can provide more room during faster running.

Which has the higher user capacity?

The MX16 has the higher capacity at approximately 136 kg.

The X21 is rated for approximately 110 kg.

Does the MX16 have incline?

The MX16 is designed around flat walking and running rather than powered incline training.

If automatic incline is important, compare other treadmill categories before purchasing.

Does the X21 have incline?

No. KingSmith states that the X21 doesn't include incline, with its folding system instead being a major focus of the design.

This makes it more suitable for buyers prioritizing compact storage over hill-style training.

Which is lighter?

The X21 weighs approximately 37 kg, while the MX16 weighs approximately 47 kg.

The X21 may therefore be easier to reposition regularly.

Do both treadmills fold?

Yes. Both use KingSmith's space-saving folding concept and can be stored in a much smaller footprint than conventional treadmills.

This makes both models attractive for UAE apartments and multipurpose rooms.

Do the MX16 and X21 work with KS Fit?

Yes. Both support the KS Fit ecosystem for connected workout tracking.

Compatible setups can also integrate with Apple Watch through KS Fit.

Which is better for an apartment?

The X21 is attractive when compactness and lighter machine weight are the priorities.

The MX16 makes more sense when you live in an apartment but still want higher running speeds and a larger belt.

Which is better for regular running?

The MX16 provides stronger specifications for regular running because it offers a higher 16 km/h speed and a larger 1320 × 500 mm running area.

The X21 is better positioned for walking, jogging, and moderate running.

Which KingSmith is better for taller users?

The MX16's longer and wider running area may provide more room for users with longer strides.

Height isn't the only factor, however, because stride length and running speed also influence treadmill comfort.

Where can I buy KingSmith WalkingPads in Dubai?

Athletix offers KingSmith WalkingPads and foldable treadmills for customers in Dubai and across the UAE.

Current models and availability should be checked directly through the Athletix KingSmith collection before ordering.