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Sunny SF-X7110 Smart Ultra Curved Manual Treadmill belt size

The Sunny SF-X7110 Smart Ultra Curved Manual Treadmill belt is 59 x 17.7 inches. By our belt rule that 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.

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

Quick answer

The Sunny SF-X7110 Smart Ultra Curved Manual Treadmill belt is 59 x 17.7 inches. By our belt rule that 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.

Published figure: 59 x 17.7 in (running surface). The length is longer than 100% of the 2 manual treadmills we track with a published belt.

Who it fits

Suits users up to about 300 lb with 30 lb of headroom (rated 330 lb) and 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.

Key specs

Speeduser-driven (no speed cap)
Inclinenone (curved deck)
Weight limit330 lb
Belt (running surface)59 x 17.7 in (running surface)
Machine weight157 lb
Size67.7 x 29.9 x 59.05 in; step-up 11.4 in min / 16.5 in max
Foldingno
Handle or handrailyes, fixed handlebars
Remoteno
AppSunnyFit (Bluetooth)
Motornone (self-powered)
Warranty3-year structural frame, 180 days other parts and components
TypeManual treadmill
Price tierPremium tier

Sources for these figures: sunnyhealthfitness.com, ocdevel.com, camelcamelcamel.com. Specs last checked October 30, 2026.

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

More about the Sunny SF-X7110 Smart Ultra Curved Manual Treadmill

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.

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Questions

What is the Sunny SF-X7110 Smart Ultra Curved Manual Treadmill belt size?

The Sunny SF-X7110 Smart Ultra Curved Manual Treadmill belt is 59 x 17.7 inches. By our belt rule that 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.