Horizon 7.4 AT vs WalkingPad X21: Specs Compared

Quick answer

Pick the Horizon 7.4 AT for a higher weight limit (350 lb vs 240 lb) and a longer belt (60 in vs 47.6 in).

Specs side by side

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Product	Max user	Belt	Weight	Speed	Incline	Folds	Remote	App	Size	Warranty	Where to buy
1 Horizon 7.4 ATPremium tier	350 lb	22 x 60	Not published	0.5 to 12 mph	0 to 15%	✓ Yes	Not published	Bluetooth FTMS: Zwift	73 x 37 x 63 in (measured)	Lifetime frame and motor	Check price on Amazon
2 WalkingPad X21Premium tier	240 lb	47.6 x 18.1	81 lb	1 to 7.5 mph	None	✓ Yesdouble fold	✕ NoNo	Yes, KS Fit	55.8 x 27.9 x 41.4 in; folded 39.6 x 27.9 x 8.8 in	1 year, optional extension	Check price on Amazon

Figures are as published by the maker unless the product section below says otherwise. Hover or tap a cell for the full note. We link to the live price instead of printing one, because prices change daily.

Who should pick which

Pick the Horizon 7.4 AT if

you weigh more than about 210 lb. It is rated for 350 lb against 240 lb, and we suggest 30 lb of headroom above your weight.
you are tall or walk briskly. Its 60-inch belt suits walkers up to about 9'9" at slow desk pace (8'6" with 6 inches of room to drift), and up to about 7'9" for brisk walking, against 7'2" at slow desk pace on the 47.6-inch belt.
you drift sideways while you read or type. A 22-inch belt gives more room than 18.1 inches.
you want to walk uphill. It has motorized incline up to 15%, while the WalkingPad X21 is flat.
you also want to jog or run. It reaches 12 mph against 7.5 mph.

Pick the WalkingPad X21 if

On published specs it has no clear advantage here, so it comes down to price, looks and availability.

Fit check

Model	User weight (with 30 lb headroom)	Height, slow desk pace	Height, with room to drift	Height, brisk walking
Horizon 7.4 AT	up to about 320 lb	up to about 9'9"	up to about 8'6"	up to about 7'9"
WalkingPad X21	up to about 210 lb	up to about 7'2"	up to about 6'0"	up to about 5'5"

Height fit uses our belt rule: a walking step of 0.41 times your height (0.45 when brisk), plus 12 inches for your shoe, plus 6 inches of room to drift where noted. It is a rough guide, not a measurement of you.

Horizon 7.4 AT

Steep incline walks with your own appsHorizon Fitness 7.4 AT Folding Treadmill

Max user 350 lbBelt 22 x 60Incline 0 to 15%Folds Yes

Premium tierCheck price on Amazon

WalkingPad X21

Most compact folding jogging treadmillWalkingPad X21 Double-Fold Treadmill

Max user 240 lbBelt 47.6 x 18.1Incline NoneFolds Yes, double fold

Read our full review →

Premium tierCheck price on Amazon

Related comparisons

Full specs: Horizon 7.4 AT, WalkingPad X21.

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

Which holds more weight, the Horizon 7.4 AT and WalkingPad X21?

The Horizon 7.4 AT, rated 350 lb, against 240 lb for the WalkingPad X21.

Which is better for tall people?

The Horizon 7.4 AT has the longest belt at 60 inches, which suits walkers up to about 9'9" at slow desk pace (8'6" with 6 inches of room to drift), and up to about 7'9" for brisk walking, by our belt rule.