Sunny SF-X7110 vs WalkingPad X21: Specs Compared

Quick answer

Pick the Sunny SF-X7110 Smart Ultra Curved Manual Treadmill for a higher weight limit (330 lb vs 240 lb) and a longer belt (59 in vs 47.6 in); pick the WalkingPad X21 for less weight to move (81 lb vs 157 lb) and folding in half.

Specs side by side

Scroll sideways for all specs →

Product	Max user	Belt	Weight	Speed	Incline	Folds	Remote	App	Size	Warranty	Where to buy
1 Sunny SF-X7110 Smart Ultra Curved Manual TreadmillPremium tier	330 lb	59 x 17.7	157 lb	User-driven	None	✕ No	✕ No	SunnyFit	67.7 x 29.9 x 59.05 in; step-up 11.4 in min / 16.5 in max	3-year structural frame	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 Sunny SF-X7110 Smart Ultra Curved Manual Treadmill if

you weigh more than about 210 lb. It is rated for 330 lb against 240 lb, and we suggest 30 lb of headroom above your weight.
you are tall or walk briskly. Its 59-inch belt suits walkers up to about 9'6" at slow desk pace (8'4" with 6 inches of room to drift), and up to about 7'7" for brisk walking, against 7'2" at slow desk pace on the 47.6-inch belt.

Pick the WalkingPad X21 if

you will move it in and out of storage often. It weighs 81 lb against 157 lb.
storage space is tight. It folds (Yes, double fold); the other one does not fold its deck.

Fit check

Model	User weight (with 30 lb headroom)	Height, slow desk pace	Height, with room to drift	Height, brisk walking
Sunny SF-X7110 Smart Ultra Curved Manual Treadmill	up to about 300 lb	up to about 9'6"	up to about 8'4"	up to about 7'7"
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.

Sunny SF-X7110 Smart Ultra Curved Manual Treadmill

Curved trainer for walking and runningSunny Health & Fitness Smart Ultra Manual Treadmill, Curved, Non-Motorized, 8 Levels of Magnetic Resistance - SF-X7110

Max user 330 lbBelt 59 x 17.7Incline noneFolds no

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: Sunny SF-X7110 Smart Ultra Curved Manual Treadmill, 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 Sunny SF-X7110 Smart Ultra Curved Manual Treadmill and WalkingPad X21?

The Sunny SF-X7110 Smart Ultra Curved Manual Treadmill, rated 330 lb, against 240 lb for the WalkingPad X21.

Which is better for tall people?

The Sunny SF-X7110 Smart Ultra Curved Manual Treadmill has the longest belt at 59 inches, which suits walkers up to about 9'6" at slow desk pace (8'4" with 6 inches of room to drift), and up to about 7'7" for brisk walking, by our belt rule.

Which is lighter to move?

The WalkingPad X21 at 81 lb.