WalkingPad (KingSmith) WalkingPad X21 Double-Fold Treadmill

WalkingPad (KingSmith) WalkingPad X21 Double-Fold Treadmill

By WalkingPad (KingSmith) · Walking Pads · Health & Lifestyle

  • Max speed: 7.5 mph (12 km/h)
  • Max user weight: 240 lb
  • Machine weight: approx. 90-93 lb
  • Double-fold design folds twice for slim storage

Lowest price seen
~$799.00 (approx.)
from $799.00 at Amazon

Prices are snapshots. Check the current price with the store.

Problems, parts and running costs

Summary

A double-fold compact treadmill for small homes that walks and light-jogs at up to 7.5 mph, stores upright against a wall at 8.8 in thick and arrives fully assembled. Check the belt length before you buy: the 47.6 in deck is short for tall or long-strided runners, and the handlebar is fixed, so it is not an under-desk machine.

Strengths

  • Folds twice and stands upright at 8.8 in thick, the main reason to buy it.
  • Arrives assembled and weighs 81 lb net, light enough for one person to move on hard floors.
  • The rotary SpeedDial is praised as intuitive with good tactile feedback.
  • Quiet at walking and jogging speeds, about 60 dB in one reviewer’s measurement.
  • The 240 lb limit and 7.5 mph ceiling cover walking and light jogging.
  • Ships with a one-year warranty and a 30-day return window.

Weaknesses

  • The deck folds in the middle, and all four hands-on reviewers felt the hinge seam underfoot.
  • The 47.6 in belt is short for tall or long-strided runners.
  • The handlebar is fixed and cannot be removed, so it does not fit under a standing desk.
  • No incline, no cup holder and no working heart-rate input.
  • Small transport wheels struggle on carpet, rubber mats and deep pile.
  • The device holder is not stable enough for a tablet at running speed.

Verified specifications

Speed range1–7.5 mph (1.6–12 km/h).
Running area47.6 × 18.1 in (1210 × 460 mm); KingSmith rounds this to 47 × 18 in (1200 × 460 mm).
Max user weight240 lb (110 kg).
Motor3.75 HP brushless on the US page; 918 W and roughly 1–1.25 HP continuous per UK and Australian sources.
Weight81 lb (37 kg) net, 92 lb (42 kg) gross; reviewers weighed 82–93 lb.
Voltage110 V US; UK and Australian units use 220–240 V and are not interchangeable.
Folded39.6 × 27.9 × 8.8 in (1007 × 711 × 225 mm). Unfolded: 55.8 × 27.9 × 41.4 in (1419 × 711 × 1053 mm).
Handrailfixed and not removable; no remote controller; no incline or decline.
Controlsrotary SpeedDial with 3 mph jumps per twist and 0.1 mph fine steps, or the KS Fit app.
CushioningEVA and PET layers.
DisplayLED dial readout for time, speed, distance and calories.
Safetya safety key stops the motor when pulled, and the machine will not run without it.
Deliveryships fully assembled; only the phone holder needs bolting on.
Full research notes and sources

The double fold and what it is not

The X21 folds once at the middle of the deck and again at the frame, so it stores upright against a wall at 8.8 in thick and unfolds to a 55.8 in long footprint. It arrives fully assembled; the only job is bolting the phone holder to the upright with two bolts and the included hex key. Despite the WalkingPad name, it is not an under-desk walking pad. The handlebar carries the display, the SpeedDial and the device holder, and it is fixed, so the machine will not slide under a standing desk. Using it while working needs a desk taller than the handrail.

Speed, motor and noise

The manufacturer rates it at 1 to 7.5 mph with a 3.75 HP brushless motor on the US page. UK and Australian sources describe the same motor as 918 W, roughly 1 to 1.25 HP continuous, so treat 3.75 HP as a peak figure. The rotary SpeedDial is the control reviewers single out: a twist changes speed in 3 mph jumps with 0.1 mph fine steps, and the push-to-start dial gets praise for tactile feedback. At walking and jogging speeds one reviewer measured about 60 dB, and another said her husband did not notice it from anywhere in the house. At running speed the same reviewer measured about 70 dB, and PCMag’s tester could hear it from the floor above. WalkingPad’s under-65 dB claim describes an unloaded machine.

The deck hinge and the short belt

The double fold puts a hinge seam in the running surface. Every hands-on reviewer found it: noticeable at first and fading with use, more obvious in low-cushion shoes. The bigger limit is belt length. At 47.6 in the deck is short for tall or long-strided runners; PCMag’s 5'9" reviewer flagged it for anyone 6'5" or taller, TreadmillReviews.com recommends shortening your stride and warns long-legged runners near the top speed, and RunToTheFinish uses hers for walking and says plainly she would not run on it. The device holder is also not stable enough for a tablet at running speed.

Ownership, warranty and running costs

Maintenance is light. WalkingPad recommends lubricating the belt every three months, which the folding design makes easy to reach. Belt alignment can drift and needs the included hex key; PCMag’s belt moved right within a three-month test and a quarter turn counterclockwise at the bottom-left adjuster fixed it. The warranty is one year, with returns accepted for 30 days after delivery. WalkingPad covers shipping both ways inside 30 days but not after, and its return policy declines to refund shipping in several cases, including “no reason given” and “not useful for intended purpose”; the UK version also lists belt misalignment. There is no subscription: the KS Fit app is free. The recurring costs are a floor mat for noise and floor protection, silicone oil for the belt and electricity, and no price for those was found on the pages read.

Is it worth it?

At the October 2026 check the WalkingPad US store listed the X21 at $799 against a $999 compare-at, and its own compact-treadmill guide showed the same $799. The UK store showed £699 against £999, the Canadian store C$769 against C$1,199, and the Australian store A$1,399 against A$1,499. PCMag’s November 2024 review used a $1,199 MSRP, and KingSmith’s corporate storefront still listed $1,199 with the machine out of stock. Below about $700 it is a clear step up from the sub-$350 walking pads owners describe burning out inside two years, though that comparison is category-level, not exact-model. At $799 it is a defensible buy when floor space is the binding constraint and you plan to walk and jog rather than run. At the $1,199 MSRP, WalkingPad’s own longer-belt X25 and the larger X218 are the better comparisons.

Sources

Manufacturer:

Independent reviews:

Owner reports:

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