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One free scan finds every outdated or missing driver and matches the right update for your exact hardware.Free scan · exact hardware matchKingSmith’s two space-saving treadmill designs solve different storage problems. Its Vertical Fold models are built to fold into an upright position; Foldable Classic models keep a more familiar treadmill shape and fold the deck for storage. The exact storage position, running capability, and specifications depend on the model.
Two designs, two ways to reclaim floor space
KingSmith describes the series as successive responses to the challenge of fitting a treadmill into a home. Vertical Fold changes the treadmill’s storage geometry: its double-fold deck is designed to stand upright. Foldable Classic keeps the traditional treadmill form and lets the running deck fold flat after use.
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That distinction is more useful than treating either name as a promise that every model fits every room. Upright storage is model-specific, and a folded treadmill still needs room for its full dimensions and a safe place to stand.
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How the formats developed
The chronology below is KingSmith’s account of its own product history. The dates and descriptions are manufacturer-reported; they are not independent confirmation of category-wide “first” claims.
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| Milestone | What KingSmith says changed |
|---|---|
| Just Walk, 2016 | The company’s first format in its four-stage product-history account. |
| Hybrid, 2019 | The next format identified in the company’s timeline. |
| Vertical Fold, 2021 | The X21 began the series, with a double-fold deck designed to stand at 90 degrees for storage. |
| Foldable Classic, 2026 | The company’s timeline identifies this as the next format milestone. Its history says G1 and G2 established the traditional-form treadmill with a deck that folds flat. |
Vertical Fold: a deck that stands upright
KingSmith says the X21 launched in 2021 and began the Vertical Fold series. Its company-published article states that the folded X21 takes up less than 2 sq. ft. (0.2 m²) of floor space; this is the manufacturer’s figure, not an independent measurement.
The company’s history describes later models across a range of speed ratings and configurations. It associates the X208 with 5 mph, X210 with 6.5 mph, X212 (formerly X21) with 7.5 mph, X214 with 8.5 mph, X216 (formerly X16 or X25) with 10 mph, and X218 with 11.5 mph. Names, versions, and availability may differ by market, so those historical associations should not substitute for the exact model’s current listing.
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Foldable Classic: familiar form, folding deck
KingSmith says G1 and G2 established the Foldable Classic format: a traditional treadmill form whose deck folds flat after use. The company also describes the series’ expansion into U.S. Costco stores as a distribution milestone.
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In its 2026 account, KingSmith says the G5i added 18% powered incline while retaining the foldable deck. Its current Foldable Classic page lists the G5i with 18% auto incline and the G1+ with a maximum speed of 7.5 mph. Those are manufacturer-listed specifications, not independent performance tests.
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What the current collection specifications show
WalkingPad’s Vertical Fold collection currently displays the following U.S. specifications. They are the manufacturer’s displayed figures at access in 2026; confirm the exact product listing and market because naming and versions can vary.
| Model | Listed speed range | Weight capacity | Running area | Folded dimensions |
|---|---|---|---|---|
| X218 | 1–11.5 mph | 300 lb | 55.1 × 20 in | 42.5 × 33 × 11.6 in |
| X25+ | 1–10 mph | 300 lb | 51.9 × 19.6 in | 10.1 × 30.4 × 40.3 in |
| X214 | 1–8.5 mph | 242 lb | 47.6 × 18.1 in | 40 × 27.9 × 8.6 in |
The measurements help compare these three listings, but they do not establish every detail needed for a purchase. For any model, check the product page and manual for its running area, maximum speed, capacity, handrail configuration, incline, folded dimensions, and approved storage position.
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How to choose for your room and workouts
Start with the workout, not the fold
For running, KingSmith’s FAQ recommends comparing maximum speed, running area, handrails, and weight capacity. It identifies X Series models and the G5i as running-capable, while giving the X21 and X218 as examples at 7.5 mph and 11.5 mph respectively. These examples do not establish that every model in either series has the same running performance; check the specific model’s current specifications.
Also consider whether the belt dimensions and handrail arrangement suit the intended user and workout. A high listed top speed alone does not describe the available running area or the model’s configuration.
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Measure the exercise space and the storage space
Measure the space needed when the treadmill is open as well as the room available after folding. Compare the machine’s full dimensions and folded dimensions with the routes through which it must pass, nearby furniture, and the surface where it will be stored. A vertical-folding design may save floor area, but only if the particular model is approved for upright storage and can be secured as its instructions require.
The FAQ identifies X21, X214, X25, and X218 as examples designed for upright storage, and says the G5i supports both vertical and flat storage. Do not generalize those positions to the entire lineup. Follow the exact model’s product page or manual for its permitted position, locking or support mechanism, and safety instructions.
Check features and accessories by exact model
App compatibility and functions vary across models. KingSmith describes KS Fit as its free official app; optional third-party services such as Kinomap may require a paid membership, and compatibility varies. Noise also depends on model, speed, user weight, flooring, and maintenance. The company says a treadmill mat may help reduce vibration and impact noise; check mat dimensions and model fit before buying one.
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What the company history does—and does not—establish
The timeline, design descriptions, performance figures, and product specifications above are company-reported. They explain how KingSmith positions Vertical Fold and Foldable Classic, but they are not an independent comparative test of stability, noise, durability, or running experience. A suitable model depends on its exact specifications and approved storage instructions, not just the series label.
Quick Recap
Product prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on Amazon at the time of purchase will apply.
