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WalkingPad X21 specs

WalkingPad X21 Double-Fold Treadmill. Best for: most compact folding jogging treadmill.

Specs checked October 30, 2026 · Built from published specs, not our own testing

Most compact folding jogging treadmillWalkingPad X21 Double-Fold Treadmill
Max user 240 lbBelt 47.6 x 18.1Incline NoneFolds Yes, double fold
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Full specs

Speed1 to 7.5 mph
InclineNone
Weight limit240 lb
Belt (running surface)47.6 x 18.1 in
Machine weight81 lb
Size55.8 x 27.9 x 41.4 in; folded 39.6 x 27.9 x 8.8 in
FoldingYes, double fold
Handle or handrailYes, fixed upright bar
RemoteNo
AppYes, KS Fit (NFC quick connect)
MotorBrushless; 3.75 HP (WalkingPad.com) or 1.25 HP (KingSmith.com)
Warranty1 year, optional extension (WalkingPad.com)
TypeTreadmill
Price tierPremium tier

Who it fits

Suits users up to about 210 lb with 30 lb of headroom (rated 240 lb) and walkers up to about 7'2" at slow desk pace (6'0" with 6 inches of room to drift), and up to about 5'5" for brisk walking.

Strengths and drawbacks on paper

Pros

  • folds twice to 8.8 in thick; up to 7.5 mph; fully assembled; quiet brushless motor per reviewers; simple dial control

Cons

  • no incline; 240 lb limit; short belt for running; fold seam felt underfoot per reviewers; small wheels on carpet

Skip it if: Skip it if you want a desk walker, weigh over 240 lb, are a tall runner, or want incline.

How it compares on paper

  • Its 47.6-inch belt is longer than 0% of the 6 treadmills we track that publish a belt length.
  • Its 240 lb rating is higher than 0% of the 7 treadmills we track.
  • At 81 lb it is lighter than 100% of the 6 treadmills with a published weight.
  • Its top speed of 7.5 mph is faster than 0% of the 7 treadmills we track.

Quick answers

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Compare the WalkingPad X21 with

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Read our full WalkingPad review

Our buying guides

How these pages are built

Every figure comes from the maker's product page, manual or the Amazon listing, and we only include models with a live, in-stock Amazon listing we checked ourselves. When sources disagree on a weight limit we use the lowest number. We do not test these machines ourselves.

Height fit starts from a typical walking step of 0.41 times your height (0.45 when walking briskly), adds 12 inches for your shoe, and 6 more inches of room to drift for a comfortable fit. These are rough guides, not measurements of you. Weight fit leaves 30 lb of headroom above your body weight.

How we research

Questions

What is the WalkingPad X21 weight limit?

The published limit is 240 lb. With 30 lb of headroom, it suits users up to about 210 lb.

How tall can you be for the WalkingPad X21?

By our belt rule, its 47.6-inch belt suits walkers up to about 7'2" at slow desk pace (6'0" with 6 inches of room to drift), and up to about 5'5" for brisk walking.

Does the WalkingPad X21 fold?

Folding: Yes, double fold.