Product Overview: Karman S-ERGO ATX Active Wheelchair
The Karman S-ERGO ATX is a high-performance, ultra-lightweight folding active wheelchair designed for users who self-propel daily and require advanced ergonomic posture support. It combines the portability and convenience of a collapsible folding frame with the structural rigidity, multi-geometrical cross-bars, and high-efficiency propulsion typically expected from custom active-use mobility equipment.
Key Specifications
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Weight Capacity: Up to 275 lbs
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Seat Width: 14 inches, 16 inches, or 18 inches (paired with specific depths)
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Seat Depth: 15 inches or 18 inches (depending on configuration)
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Front Seat-to-Floor Height: 17 inches to 20 inches (adjustable via caster selection)
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Rear Seat-to-Floor Height: 16 inches to 20 inches
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Starting Frame Weight: Approximately 15.4 lbs (excluding wheels and accessories)
Product Specs
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Frame Material: 6061 T-6 aircraft-grade aluminum with high-strength hydroformed tubing
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Seating System: Globally patented S-Shape ergonomic seating frame designed to promote spinal alignment and prevent forward sliding
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Axle Plate & Center of Gravity: Adjustable center of gravity settings (Standard 0°, Stable 5°, or Active -5°)
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Back Canes: Height and angle-adjustable (85°, 90°, or 95°) with optional folding or fixed push handles
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Footrests: One-piece foldable footplate with fully adjustable angle and height increments
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Upholstery: Tension-adjustable back and seat sling integrated with Aegis anti-bacterial treatment
What Makes This Different
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Globally Patented S-Shape Seating: Unlike flat sling seats that cause pressure hot spots and forward sliding, the S-Ergo contour naturally distributes body weight, offering built-in pressure relief and core postural support.
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Rigid-Feel Folding Architecture: Advanced multi-geometrical extruded cross-braces eliminate the excessive frame “slop” common in standard folding chairs, ensuring that propulsion energy translates efficiently to the pavement.
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Micro-Adjustable Customization: It features extensive configurability—including adjustable front- and rear-seat-to-floor heights, center-of-gravity adjustments, and infinite footplate angle positioning—allowing it to be tailored closely to an individual’s biomechanics.
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Exceptional Strength-to-Weight Ratio: Weighing a mere 15.4 lbs at the frame level, it drastically reduces upper-body fatigue during daily self-propulsion and vehicle loading.
Why We Like It
We appreciate the Karman S-ERGO ATX because it brings specialized, ergonomic active mobility into a flexible folding format. For users who need the clinical benefits of the S-Shape seating system—such as enhanced pressure management and posture control—without committing to a fully welded, rigid, non-folding frame, the ATX hits a sweet spot. It delivers a sporty, high-efficiency ride that respects the user’s energy, protects against slouching, and makes everyday transport remarkably manageable.
