The WalkingPad X21 is an award-winning, premium double-fold treadmill engineered to combine full-scale running capability with revolutionary space-saving design. Designed by KingSmith, this high-performance machine features innovative 180-degree double-fold technology alongside a 90-degree vertical folding handrail, shrinking its storage footprint down to a ultra-thin 8.9-inch profile.
Powered by a high-efficiency 1.25 HP brushless motor operating at a whisper-quiet 65 dB, the X21 reaches top speeds of up to 7.5 MPH (12 km/h) for walking, jogging, and cardio runs. Operated via an integrated handrail LED display with a digital spin-control knob, this sleek treadmill features one-touch NFC smartphone pairing, a four-layer cushioned running deck, and a premium aluminum alloy skeleton.
Key Product Features & Core Technology
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Double-Fold Vertical Storage Tech: Patented 180° folding deck combined with a 90° folding handrail allows the treadmill to stand completely upright with a depth of just 8.9 inches.
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Integrated Handrail LED & Spin Dial: Sleek high-visibility LED screen integrated directly into the handrail bar, controlled via a quick-turn center knob to start, stop, and adjust speed.
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1.25 HP Quiet Brushless Motor: Energy-efficient motor delivers smooth, continuous power with ultra-quiet operation under 65 dB to prevent noise disruption.
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One-Touch NFC Connectivity: Touch your NFC-enabled smartphone to the handrail panel for instantaneous pairing and real-time workout metric sync to your device.
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4-Layer EVA Cushioned Running Deck: Spacious 47.6" × 18.1" running surface constructed with multi-layer shock absorption to cushion joints and reduce impact noise.
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Durable Aluminum Alloy Skeleton: Premium structural frame offers maximum stability, supporting runners up to 242 lbs (110 kg) while remaining lightweight and easy to maneuver.
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KS Fit App Integration: Connect via Bluetooth to the KS Fit mobile app to track historic performance data, access custom workout routines, and monitor heart rate metrics.
Technical Specifications Summary
| Feature / System Metric | Specification |
| Brand / Manufacturer | KingSmith WalkingPad |
| Model Series | X21 Double-Fold Treadmill |
| Frame Material | High-Grade Integrated Aluminum Alloy |
| Motor Type | 1.25 HP High-Efficiency Brushless Motor (65 dB) |
| Speed Range | 0.6 – 7.5 MPH (1 – 12 km/h) |
| Max User Weight Capacity | 242 lbs (110 kg) |
| Running Surface Area | 47.6" L × 18.1" W (1,210 mm × 460 mm) |
| App & Connectivity | KS Fit App / One-Touch NFC / Bluetooth |
| Console Display | Integrated Handrail LED Display with Spin-Control Knob |
| Folded Dimensions | 39.8" L × 28.0" W × 8.9" H (1,011 × 711 × 225 mm) |
| Unfolded Dimensions | 55.9" L × 28.0" W × 41.3" H (1,420 × 711 × 1,050 mm) |
| Net Unit Weight | 83.8 lbs (38 kg) |
Package Contents
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1 × WalkingPad X21 Double-Fold Treadmill Unit
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1 × Detachable Phone / Tablet Holder Bracket
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1 × Emergency Stop Safety Tether & Key
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1 × Standard 110V US Power Cord
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1 × Allen Wrench for Belt Alignment
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1 × Silicone Belt Lubricant Bottle
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1 × User Operations & Assembly Manual
Safety & Setup Guidelines
100% Fully Assembled Out of the Box: Arrives completely pre-assembled. Simply unbox, unfold the upright handrail and deck, attach the safety key, and plug directly into a power outlet.
Proper Storage Position: When storing vertically, ensure the handrail lock latches are engaged and the unit is resting on a level, stable floor against a secure wall or inside a closet.
Power Connection: Plug directly into a grounded 110V household power socket; avoid using extension cords or multi-plug adapters to ensure stable current to the motor.
