Karman S-ERGO ATX Active Wheelchair, 15.4 lb, 14″ to 18″ Seat, 275 lb | Ultra Lightweight Custom Performance Chair
$2,040.00
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Karman S-ERGO ATX active wheelchair has a 15.4 lb aluminum frame built to order, an S-shape ergonomic seat in 14″ to 18″ widths and a 275 lb capacity, for active full-time users who want a light, tuned chair. Ships nationwide.
✔ 15.4 lb Aluminum Frame, Built to Your Order
✔ Patented S-Shape Ergonomic Seating Frame
✔ Adjustable Center of Gravity and Seat Height
✔ Back Angle 85°, 90° or 95°, Height 10.5″ to 15″
✔ 24″ Quick-Release Pneumatic Spoke Wheels
✔ 14″, 16″ or 18″ Seat, 275 lb Capacity
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Description
Karman S-ERGO ATX Active Wheelchair, 15.4 lb Custom-Built Ultra Lightweight Performance Chair, 275 lb
The Karman S-ERGO ATX is an active wheelchair for people who push themselves all day and want a chair set up for their body, not an off-the-shelf frame. The 6061 T-6 aircraft-grade aluminum frame starts at 15.4 lb, and Karman adjusts every chair to the order specifications before it leaves the factory.
You choose the seat size, front and rear seat height, center of gravity, back height and angle, footplate height, casters and armrests. That build-to-order setup, a tension-adjustable seat and back, quick-release 24″ spoked rear wheels and a 275 lb capacity make it a true performance wheelchair for daily independence.
Not sure if an active, configured chair is the right type? Our most comfortable wheelchair guide matches the chair to how the user sits all day, and the Manual Wheelchair Knowledge Base explains seat width, depth, seat height and center of gravity before you choose your build.
Why Choose the Karman S-ERGO ATX Active Wheelchair?
Most folding wheelchairs are built to fit everyone a little. The ATX is built to fit one user well. Karman’s globally patented S-Shape seating frame follows the curve of the body to spread pressure and help keep the hips back in the seat, and the multi-geometry extruded cross bars keep the frame stiff, so more of each push goes into moving forward. Rear wheel position, back height and back angle let you trade quick handling and upper-body freedom for stability and support. It is a sporty wheelchair for everyday life, not a racing chair.
Who Is This Performance Wheelchair Best For?
The S-ERGO ATX is a good fit for:
- Full-time users who self-propel every day and feel the difference a lighter, stiffer frame makes
- Users who know their measurements or are working with a therapist on seat height, angle and balance
- People with cerebral palsy, MS, spinal cord injury or stroke who self-propel and benefit from a fitted, adjustable seat (a clinician should guide the setup; as a cerebral palsy wheelchair, its value is in the fit)
- Users up to 275 lb who fit a 14″, 16″ or 18″ wide seat
Choose something else if the user needs:
- A ready-to-ship ergonomic chair without a custom build: see the Karman S-ERGO 115 or S-ERGO 125
- An adjustable lightweight chair at a lower price: look at the Karman Flexx
- Mostly caregiver pushing, tilt or recline: compare options in the comfort guide
Karman S-ERGO ATX Specifications
| Model | Karman S-ERGO ATX (S-ATX) |
|---|---|
| Frame | 6061 T-6 aircraft-grade aluminum, patented S-Shape seating frame |
| Frame weight | 15.4 lb starting frame weight |
| Weight with standard options | 26 to 30 lb, depending on build |
| Weight capacity | 275 lb |
| Seat width | 14″, 16″ or 18″ |
| Seat depth | 16″ or 18″ (14″ x 15″ also offered) |
| Front seat height | 17″, 18″, 19″ or 20″ (5″ casters at 17″ to 18″, 6″ casters at 19″ to 20″) |
| Rear seat height | 16″ to 19″, set to order |
| Back post height | 10.5″ to 15″ |
| Back post angle | 85°, 90° or 95° |
| Center of gravity | Adjustable rear wheel position: stable, standard or active |
| Armrests | Flip-back, 8.5″ armrest height (or omitted for an active setup) |
| Footplate | One-piece folding footplate, height adjustable (14″ to 17″ seat to footplate), unlimited angle adjustment |
| Rear wheels | 24″ x 1″ quick-release pneumatic, 36 spoke |
| Front casters | 5″ x 1″ or 6″ x 1″ flat-free polyurethane |
| Push handles | None standard; fixed or folding handles optional |
| Overall open width | 21″ (14″ seat), 23″ (16″ seat), 25″ (18″ seat) |
| Folded width | 14″ |
| Overall length | 36″ |
| Overall height | 29″ to 38″, depending on seat height and options |
| Frame colors | Fashion White or Diamond Black, Aegis-treated high gloss metallic paint |
| Shipping box | 38″ L x 16″ W x 32″ H |
Sizing and Your Build
Start with seat width: measure across the hips while seated and add about 1″ to 2″. Seat depth should leave two to three fingers between the seat edge and the back of the knee. Lower seat heights give a stronger push; higher ones make transfers easier. A forward center of gravity feels lively but tips back more easily, so new users often start at the standard position. Some settings can be fine-tuned later; frame size and seat height are set when Karman builds the chair.
Comfort Upgrades and Accessories
The ATX ships with a tension-adjustable sling, which you can tighten where you need more support. Most daily users add a cushion: for pressure relief or positioning, see the Comfort Company cushions under Complete Your Chair below. The options above also include Frog Legs front fork suspension for a smoother ride outdoors. Caregivers who help on hills can add the Karman HD-9000 companion push handles, made for this chair.
Care and Maintenance
- Check rear tire pressure weekly; pneumatic tires roll best at the pressure printed on the sidewall
- Press the quick-release axle button and pull to check that each wheel is locked in place before you ride
- Wipe the frame and upholstery with mild soap and water; let the sling dry before folding
- Keep axles and caster forks free of hair and lint, and have the chair checked once a year
What’s Included
S-ERGO ATX frame built to your selected size, seat heights, center of gravity, back height and angle, casters, armrests and footplate; tension-adjustable seat and back upholstery; 24″ quick-release pneumatic rear wheels. Push handles, cushions, suspension and other accessories ship only if selected.
❓ Active Wheelchair FAQ
What is an active wheelchair?
A lightweight, adjustable manual wheelchair set up for a user who propels on their own every day. The frame is fitted to the body, so it rolls and turns with less effort than a standard folding chair.
How much does the Karman S-ERGO ATX weigh?
The frame starts at 15.4 lb. With standard options it weighs about 26 to 30 lb, depending on the build.
What is the weight capacity?
275 lb.
What seat sizes are available?
Seat widths of 14″, 16″ and 18″, with 16″ or 18″ depth, plus a 14″ x 15″ size. Choose your size in the options above.
Is it a good cerebral palsy wheelchair?
For users with cerebral palsy who self-propel, the fitted S-Shape seat and adjustable seat height, angle and balance can help with posture and control. Fit matters most, so plan the setup with a therapist or clinician.
Does the ATX fold?
Yes. It folds to 14″ wide, and the quick-release rear wheels come off for a smaller load in the car.
Can it be used outdoors?
Yes. The 24″ pneumatic rear tires absorb bumps, and Frog Legs suspension is optional.
Do you ship nationwide?
Yes, we ship the S-ERGO ATX nationwide as an authorized Karman dealer. Call 585-505-6665 for help choosing your build.
🔗 Wheelchair Guides, Answers & Tools
Want help choosing? Start with these guides, or call us at 585-505-6665.
👉 Most Comfortable Wheelchair (2026): 22 Picks by Need
👉 Manual Wheelchair Knowledge Base
👉 Manual Wheelchair Assessment Tool
👉 Home Medical Equipment Knowledge Base
👉 Browse Lightweight Wheelchairs
PRODUCT SPECIFICATION
| Specification | Details |
|---|---|
| Product Name | S-ERGO ATX Active Wheelchair |
| Category | Active / Ultralightweight Manual Wheelchair |
| Frame Material | 6061 T-6 Aircraft-Grade Aluminum |
| Frame Design | Multi-Geometrical Extruded Cross Bars (Rigid + Compact) |
| Frame Weight | 15.4 lbs (Starting Frame) |
| Total Weight | Approx. 26 – 30 lbs (Depending on Configuration) |
| Weight Capacity | 275 lbs |
| Seat Width Options | 14″ • 16″ • 18″ |
| Seat Depth Options | 16″ • 18″ (15″ for the 14″width) |
| Available Size Configurations | 14″ x 15″ 16″ x 16″ 16″ x 18″ 18″ x 16″ 18″ x 18″ |
| Front Seat Height | 17″ • 18″ • 19″ • 20″ |
| Rear Seat Height | 16″ • 17″ • 18″ • 19″ |
| Back Cane Height | Approx. 10.5″ – 15″ (Adjustable Range) |
| Back Cane Angle | 85° • 90° • 95° |
| Armrest Height | 8.5″ |
| Armrest Options | Flip-Back Armrests or Optional Removal |
| Footplate | One-Piece Foldable Footplate (Standard) |
| Footplate Adjustability | Height & Angle Adjustable (Unlimited Positioning) |
| Front Casters | 5″ or 6″ (Based on Seat Height Configuration) |
| Rear Wheels | 24″ Pneumatic 36-Spoke Quick Release Wheels |
| Center of Gravity | Adjustable (Performance vs Stability Tuning) |
| Seating System | Patented S-Shape Ergonomic Seating Frame |
| Seat & Back Sling | Tension Adjustable Upholstery |
| Overall Width | 21″ (14″ Seat) 23″ (16″ Seat) 25″ (18″ Seat) |
| Overall Height | 29″ – 38″ (Depends on Configuration) |
| Overall Length | 36″ |
| Folded Width | 14″ |
| Frame Colors | Fashion White • Diamond Black |
| Finish | Metallic Aegis Treated High Gloss Paint |
| HCPCS Code | K0005 / E1236 |
| Optional Upgrades | Frog Legs Front Suspension Upgraded Wheels (e.g., Spinergy) Custom Configuration Components |
| Warranty | Manufacturer Limited Warranty |
| Shipping Dimensions | 38″ L × 32″ H × 16″ W |
Shipping & Returns
Shipping & Return Policy
At MedCare Mobility, we understand that purchasing medical and mobility equipment is an important decision. Our goal is to make the ordering, delivery, and return process as clear and straightforward as possible.
Because many of the products we offer are large, specialized, or shipped directly from manufacturer and distributor warehouses, shipping and return requirements may vary somewhat by product and brand. The policy below explains what you can generally expect when ordering from MedCare Mobility.
Shipping & Order Processing
We ship medical and mobility equipment to customers throughout the United States. Orders are processed as quickly as possible, and tracking information is provided once available.
Processing Time
Most in-stock orders are processed within approximately 1–3 business days. Processing may include order verification, warehouse preparation, packaging, and coordination with the manufacturer or distributor.
Some specialty equipment, made-to-order products, oversized items, or products shipping directly from a manufacturer may require additional processing time. Any estimated processing or lead time shown on an individual product page should be considered part of the expected fulfillment timeframe for that item.
Transit & Delivery Time
Once shipped, many standard orders arrive within approximately 3–7 business days. Larger medical equipment, freight shipments, specialty products, and certain manufacturer-direct orders may require additional transit time.
Tracking information will generally be emailed once the shipment has been processed by the carrier. If you have questions regarding the status of your order, please contact us at info@medcaremobility.com.
Alaska, Hawaii & Special Shipping Areas
Orders shipping to Alaska, Hawaii, and certain remote or limited-access areas may be subject to additional shipping charges. If an additional charge is required after your order is reviewed, we will contact you before proceeding whenever additional payment is necessary.
Freight & Oversized Equipment
Hospital beds, patient lifts, large recliners, ramps, and other oversized medical equipment may ship by freight rather than standard parcel service. Unless a specific delivery service is stated on the product page or order, freight delivery does not automatically include inside delivery, assembly, installation, or removal of packaging.
30-Day Return Policy
We want you to feel comfortable ordering from MedCare Mobility. Most eligible products may be returned when a return is requested within 30 days of delivery, subject to the conditions and exclusions outlined below.
Eligible products generally include:
- Electric and power wheelchairs
- Manual and lightweight wheelchairs
- Mobility scooters
- Walkers and rollators
- Patient lifts
- Wheelchair ramps
- Hospital and homecare beds
- Eligible medical mattresses
- Geriatric and medical recliner chairs
- Overbed tables
- Bathroom benches and shower chairs
- Other eligible medical and mobility equipment
Return eligibility can vary by manufacturer and product type. Products specifically identified as non-returnable, custom, made-to-order, or otherwise subject to special return terms are governed by those terms.
Return Authorization
Please contact us before shipping any product back. Returns must first be approved and issued a Return Authorization (RA) and the appropriate return shipping address.
You may request a return by emailing info@medcaremobility.com or contacting our customer service team through the live chat on our website.
Please do not return merchandise to an address shown on the original shipping label unless specifically instructed to do so. Many products ship directly from manufacturer or distributor warehouses, and the correct return location may be different from the original shipping location.
Condition of Returned Merchandise
To qualify for a return and refund, the product must be returned:
- In brand-new and unused condition
- In its complete original manufacturer packaging
- With all manuals, components, hardware, accessories, and included materials
- Without damage, modification, assembly wear, stains, odors, or other signs of use
- In resalable condition upon inspection by the receiving warehouse or manufacturer
We strongly recommend keeping the original box, pallet, protective materials, and packaging until you are certain that you intend to keep the equipment. Large medical equipment can be difficult or impossible to return safely without its original packaging.
Restocking Fees
Approved returns are subject to a mandatory restocking fee, generally ranging from 15% to 20% of the applicable product price. The exact restocking percentage varies depending on the manufacturer, brand, and type of equipment being returned.
These restocking charges are assessed to us by the manufacturer or distributing warehouse when merchandise is returned. MedCare Mobility does not add the fee simply as a return penalty; when the manufacturer requires the charge, we must pass the applicable amount through as part of processing the return.
If you would like to know the applicable restocking percentage for a particular product before ordering, please contact us and we will be happy to help whenever that information is available from the manufacturer.
Return Shipping & Shipping Charges
The customer is responsible for shipping charges associated with the order when making a standard return.
Customers are responsible for arranging for the approved merchandise to be returned to the return address provided with the Return Authorization. In certain cases, we may be able to provide a prepaid return label or coordinate return transportation for your convenience. When provided, the applicable shipping cost may be deducted from the final refund.
Because some medical equipment is oversized or requires freight transportation, prepaid labels or carrier call tags may not be available for every product. Our customer service team will provide the available return instructions when your return is authorized.
Non-Returnable Products
For health, hygiene, safety, customization, and manufacturer-policy reasons, certain products are not eligible for standard returns.
We currently do not accept returns on:
- Parts & accessories
- Wheelchair cushions and support accessories
- Patient lift slings
- Custom or made-to-order products
- Products specifically identified as non-returnable on the product page
If a non-returnable product arrives damaged, defective, or incorrect, please contact us promptly. Non-returnable status does not prevent us from assisting with a legitimate shipping damage, defect, warranty, or fulfillment issue in accordance with the applicable manufacturer and carrier procedures.
Damaged or Incorrect Orders
We take shipping damage seriously and will work with you to help resolve legitimate delivery issues.
If your product arrives damaged, please notify MedCare Mobility within 48 hours of delivery. Whenever possible, retain the shipping carton, pallet, packaging materials, and the product exactly as received and take clear photographs of the packaging and any visible damage.
Reporting damage promptly is important because carriers and manufacturers have limited timeframes for filing freight and shipping claims.
If you receive an incorrect product or believe there is a manufacturer defect, please contact us before returning or disposing of any merchandise or packaging so that we can provide the appropriate instructions.
Refused Deliveries
Please contact us before refusing a delivery unless the shipment has obvious significant freight damage and the carrier is documenting the damage at delivery.
A shipment that is refused for reasons unrelated to verified shipping damage may be treated as a standard return. Applicable restocking and shipping charges may therefore be deducted from the refund.
Return Shipping Deadline
Once a return has been approved and return instructions or a return label have been issued, the merchandise must be shipped within 72 hours unless MedCare Mobility provides different instructions in writing.
This is particularly important when a return is approaching the end of the applicable return period. Returns shipped outside the authorized timeframe may be refused by the manufacturer or warehouse and may no longer qualify for a refund.
Refund Processing
Refunds are processed after the returned merchandise has been received and inspected by the applicable warehouse or manufacturer and the return has been confirmed to meet the return requirements.
The applicable restocking fee, shipping charges associated with the order, and any other authorized return-related charges will be deducted from the amount eligible for refund.
If returned merchandise is used, damaged, incomplete, missing original packaging or components, or otherwise returned in a condition that prevents the manufacturer or warehouse from accepting it as new and resalable merchandise, the return may be refused or the refund may be reduced in accordance with the manufacturer’s assessment.
Custom & Made-to-Order Products
Products identified as custom, configured, made-to-order, special-order, or manufactured specifically for the customer cannot generally be canceled once production or manufacturer processing has begun and are not eligible for standard returns.
For custom products, cancellation may only be possible during the initial processing period and before production or customization begins. Because production schedules vary by manufacturer, we encourage customers to contact us immediately if a change is required.
If a custom product arrives damaged or has a legitimate manufacturing defect, we will work with the manufacturer to pursue the appropriate resolution, replacement components, repair, or other available remedy under the applicable manufacturer policy or warranty.
Questions Before Ordering?
Medical equipment can vary considerably in size, configuration, compatibility, and intended use. If you are unsure whether a product will work for your needs, we strongly encourage you to contact us before placing your order.
Our team is happy to help review product specifications, dimensions, options, compatibility, and available manufacturer information so you can make a more informed purchasing decision and reduce the possibility of needing a return.
For shipping, return, or product questions, contact us at info@medcaremobility.com or speak with us through the live chat on our website.
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