Type: Compact running treadmill | Motor: 1 HP brushless, 918W | Speed: up to 7.5 mph | Belt: 121 × 46 cm (the widest in the range) | Max user weight: 110 kg | Folding: double-fold, leans against a wall | Price: from £699
The WalkingPad X21 is the design flagship of the range and the reason the brand has a shelf of awards. It won both the German Red Dot and the iF Design Award, and the moment you see it fold you understand why. The X21 uses a unique double-fold mechanism: the running deck folds up vertically, then folds again to roughly half the height, leaving a slim package that leans against a wall like a piece of furniture. Nothing else on the market folds this compactly while still running to 7.5 mph.
It is a running treadmill rather than an under-desk pad, with a permanent handlebar, so it does not lie flat for desk walking the way the hybrid R2 does. What you get instead is the most compact runner WalkingPad makes, the widest belt in the range, and a genuinely lovely object to have in a small home.
Who it’s for: runners in small flats who need the most compact storage possible, design-conscious buyers who want a treadmill that looks the part, and anyone who values the wider belt and the handlebar speed dial over a desk-walking mode.
Who it’s not for: buyers who want under-desk walking as well as running (the R2 folds flat and does both for less), value hunters (the MC11 matches the running performance for around £150 less), and anyone who needs incline, which no WalkingPad offers (see UREVO).
WalkingPad X21 Specs
| Type | Compact running treadmill (permanent handlebar) |
| Motor | 1 HP brushless, 918W |
| Top speed | 7.5 mph (12 km/h) |
| Incline | None |
| Belt size | 121 × 46 cm (48 × 18 in), widest in the range |
| Max user weight | 110 kg (242 lb) |
| Folding | Double-fold to ~100 cm tall, leans against a wall |
| Speed control | Rotary dial on the handlebar, plus KS Fit app |
| Display | On-board LED |
| App | KS Fit (iOS and Android) |
| Awards | Red Dot Award, iF Design Award |
| Warranty | 1 year |
| Price | From £699 (was £999) at Walking Pad UK |
Key Features and Benefits
The Double-Fold Design
This is the X21’s headline and the feature it won its awards for. Most folding treadmills fold once, lifting the deck vertical. The X21 folds twice: deck up, then again to halve the stored height, ending up around 100 cm tall, slim enough to lean against a wall or slide into a narrow gap beside furniture. If your constraint is storage rather than budget, nothing else that runs to 7.5 mph disappears as completely as this. For a small flat where the treadmill has to vanish between sessions, it is genuinely in a class of its own.
The Widest Belt in the Range
At 121 by 46 cm, the X21’s belt is 2 cm wider than the R-series hybrids and the widest WalkingPad fits to any model. That extra width is noticeable when you run, giving taller users and anyone with a wider gait more confidence and a more natural stride. It is still narrow next to a full gym treadmill, but among compact machines it is at the generous end.
Rotary Speed Dial
Instead of fumbling with a remote or a phone mid-run, the X21 puts a rotary speed dial on the handlebar. A twist adjusts pace instantly and intuitively, which is exactly what you want when you are running and do not want to break stride or look down at a screen. It is a small touch that makes the X21 noticeably nicer to actually run on than remote-only rivals.
Motor, App and Build
A 1 HP brushless motor delivering 918W drives the belt to 7.5 mph, the same running performance as the R2 and MC11. The KS Fit app adds tracking and control, and the build quality is exactly what the awards imply: a tightly engineered, premium-feeling machine that justifies its place as the design flagship. There is no incline, in line with the rest of the range.
WalkingPad X21 Pros and Cons
Pros
- Double-fold: the most compact runner in the range
- Widest belt WalkingPad makes (46cm)
- Intuitive handlebar rotary speed dial
- Award-winning design and build
- Genuine 7.5 mph running
- Quiet brushless motor and KS Fit app
Cons
- Most expensive runner; MC11 matches it for less
- No flat walking-pad mode (permanent handlebar)
- No incline
- 110 kg weight capacity
- One-year warranty only
How the WalkingPad X21 Compares
vs WalkingPad MC11 (~£399): The MC11 matches the X21’s 7.5 mph running and adds an OLED screen, for considerably less money. What it lacks is the X21’s double-fold storage, the wider belt and the rotary dial. If you simply want to run at the lowest price, the MC11 wins. If storage space and the running feel matter most, the X21 earns its premium.
vs WalkingPad R2 (£599): The R2 is the versatile pick: handrail down for desk walking, up for running, for £100 less. The X21 has no walking-pad mode but folds far more compactly and runs on a wider belt. Choose the R2 for walk-and-run versatility, the X21 for pure compact running and storage.
vs WalkingPad A1 Pro (£429): Different machines entirely. The A1 Pro is a walking-only under-desk pad. The X21 is a running treadmill. If you only walk, save your money with the A1 Pro; the X21 is for people who run.
Verdict
The WalkingPad X21 is the most desirable machine in the range and the one to buy if your problem is space rather than money. The double-fold storage is genuinely unmatched, the wider belt and handlebar dial make it the nicest WalkingPad to actually run on, and the award-winning design is no gimmick. The catch is value: the MC11 delivers the same 7.5 mph running for around £150 less if you can live without the compact fold and the wider belt. Pay the premium for the storage and the design, not for raw performance, and the X21 is a lovely thing to own.
WalkingPad X21
From £699 (was £999) at Walking Pad UK. Interest-free finance at checkout.
WalkingPad X21 FAQs
Can you run on the WalkingPad X21?
Yes. The X21 is a running treadmill that reaches 7.5 mph (12 km/h), with a permanent handlebar and a handlebar-mounted speed dial. It is built for running rather than under-desk walking.
How compact does the X21 fold?
It uses a unique double-fold: the deck folds up vertically, then folds again to roughly halve the stored height, ending up around 100 cm tall. Folded, it leans against a wall like a slim piece of furniture, making it the most compact running treadmill WalkingPad makes.
Can you use the X21 as an under-desk walking pad?
Not really. The X21 has a permanent handlebar and is designed as a compact runner, so it does not lie flat for desk walking. If you want both desk walking and running in one machine, the WalkingPad R2 hybrid is the better choice.
X21 vs MC11: which should I buy?
Both run to 7.5 mph. The MC11 is cheaper (around £150 less) and adds an OLED screen. The X21 justifies its premium with the double-fold storage, a wider 46 cm belt and the handlebar rotary dial. Buy the MC11 for value, the X21 for storage and running feel.
Does the WalkingPad X21 have incline?
No. No WalkingPad model offers incline. For powered incline, look at UREVO, or choose a conventional treadmill.
What warranty does the WalkingPad X21 come with?
One year, standard across the range. The WalkingPad UK store handles UK shipping and returns and offers interest-free finance at checkout.
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