ProBasics K4 Transformer Hybrid Transport Wheelchair – Converts to Transport Chair
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ProBasics K4 Transformer Hybrid Wheelchair & Transport Chair
The ProBasics K4 Transformer gives users two mobility options in one wheelchair. Designed as a high-strength, lightweight K4 manual wheelchair, it can be used as a self-propelled chair with its 24-inch quick-release rear wheels or converted into a compact transport chair with integrated 8-inch rear wheels.
This dual-purpose design is especially useful for users who want the independence of self-propulsion but also need the option of attendant-assisted mobility for longer outings, appointments or situations where fatigue makes independent propulsion impractical. The aluminum frame, folding back, flip-back desk-length arms and folding design also make the Transformer practical for storage and transportation.
Need help choosing the right wheelchair?
Call 866-218-0902 to speak with a mobility specialist.
Mon–Fri 9AM–5PM · Sat 9AM–3PM · Six SW Florida Showrooms
Two Mobility Functions in One Chair
The ProBasics K4 Transformer is designed around a simple idea: one wheelchair can provide both self-propelled mobility and attendant-assisted transport. In wheelchair configuration, the 24-inch quick-release rear wheels allow the user to propel the chair using the composite handrims. When assistance is preferred, the large rear wheels can be removed and the chair can operate on its built-in 8-inch transport wheels.
Self-Propelled Wheelchair Mode
With the 24-inch quick-release rear wheels installed, the Transformer functions as a traditional self-propelled K4 wheelchair. Composite handrims provide the user with a way to propel and maneuver the chair independently, while the aluminum frame keeps overall weight manageable.
24" Quick-Release Wheels
Large rear wheels with composite handrims provide self-propulsion and can be removed without tools when converting the chair.
K4 Performance
The Transformer is built as a K0004 wheelchair and provides the features expected from a K4 manual wheelchair.
8" Front Casters
Full-swivel 8-inch front casters are mounted on sturdy aluminum forks for responsive maneuverability.
Aluminum Frame
The lightweight aluminum frame provides a strong foundation while keeping product weight between approximately 32 and 34 pounds depending on configuration.
Convert to a Transport Chair
When the user needs an attendant to provide mobility assistance, the Transformer can be converted to transport-chair configuration. The 24-inch quick-release rear wheels are removed and the built-in 8-inch rear wheels are used instead, creating a more compact chair that can be pushed by a caregiver or companion.
Use the 24-inch rear wheels and composite handrims for independent wheelchair mobility.
The quick-release rear wheels can be removed without tools when transport configuration is needed.
Use the integrated 8-inch rear wheels for attendant-propelled transport.
Compact Design for Narrower Spaces
The Transformer offers another useful advantage when the 24-inch rear wheels are removed: the chair becomes narrower and more compact for transport-chair use. The manufacturer describes this configuration as useful for navigating narrow doorways and accompanied excursions.
Flip-Back Desk-Length Arms
The padded desk-length armrests flip back to make transfers and positioning alongside tables or desks more convenient. A self-locking paddle release helps secure the arms during use.
Fold-Down Back for Storage
The back folds down using quick-release paddles, helping reduce the chair's overall size for transportation and storage. The entire wheelchair also folds for convenient handling when loading it into a vehicle or putting it away at home.
Swing-Away Footrests
Standard footrests include heel loops and composite footplates. The swing-away design allows the footrests to move out of the way for transfers, while optional elevating legrests are available separately under model WCT4ELR.
Key Features
- Dual-purpose wheelchair and transport chair design
- Functions as a self-propelled K4 wheelchair
- Converts to compact attendant-propelled transport chair
- Lightweight aluminum frame
- 24-inch quick-release rear wheels with composite handrims
- Integrated 8-inch rear transport wheels
- 8-inch full-swivel front casters
- Flip-back padded desk-length arms
- Fold-down back with quick-release paddles
- Dual-function wheel locks for both rear-wheel configurations
- Detachable flip-up rear anti-tippers
- Black woven nylon upholstery
- Accessory pouch sewn into the back
- Swing-away footrests with heel loops and composite footplates
- Folds for storage and transportation
- Optional elevating legrests available separately
- Limited lifetime frame warranty
- One-year warranty on all parts
Choose the Right Seat Width
The ProBasics K4 Transformer is available in three seat widths to accommodate different users and seating preferences. All three standard configurations use a 16-inch seat depth.
| Model | Seat Size | Arm Style | Leg Style | UPC |
|---|---|---|---|---|
| WCT41616DS | 16" W × 16" D | Flip-Back Desk-Length | Swing-Away Footrests | 815067070817 |
| WCT41816DS | 18" W × 16" D | Flip-Back Desk-Length | Swing-Away Footrests | 815067070824 |
| WCT42016DS | 20" W × 16" D | Flip-Back Desk-Length | Swing-Away Footrests | 815067070831 |
Specifications
| Specification | Details |
|---|---|
| Brand | ProBasics |
| Product | K4 Transformer Hybrid Wheelchair & Transport Chair |
| HCPCS Code | K0004 |
| Seat Widths | 16", 18", 20" |
| Seat Depth | 16" |
| Seat-to-Floor Height | 20" Adult |
| Back Height | 16" |
| Back Style | Fold-down |
| Overall Width with Arms | 18"–29" |
| Overall Depth | 28"–32" without riggings |
| Weight Capacity | 250 lb |
| Product Weight | 32–34 lb |
| Frame | Lightweight aluminum |
| Rear Wheels | 24" quick-release wheelchair wheels and integrated 8" transport wheels |
| Front Casters | 8" full-swivel |
| Upholstery | Black woven nylon |
| Warranty | Limited lifetime frame; one year all parts |
Who Is the ProBasics K4 Transformer Best For?
The Transformer is a particularly practical choice for users whose mobility needs vary throughout the day. Someone may be able to self-propel independently in one situation but need a caregiver or family member to provide transportation later during a longer outing.
Independent Users
The 24-inch rear wheels and composite handrims provide self-propelled wheelchair mobility when independence is desired.
Caregiver-Assisted Outings
Convert to transport mode when a caregiver or companion needs to push the user.
Travel & Appointments
The folding design and dual-purpose configuration can eliminate the need to bring separate wheelchair and transport-chair equipment.
Narrower Spaces
Removing the large rear wheels creates a more compact transport configuration that can help when navigating narrower doorways.
Frequently Asked Questions
It is both. The Transformer functions as a self-propelled K4 wheelchair with 24-inch rear wheels and converts to an attendant-propelled transport chair using its integrated 8-inch rear wheels.
The manufacturer specifies a maximum weight capacity of 250 pounds.
The Transformer is available with 16-inch, 18-inch or 20-inch seat widths. All standard configurations have a 16-inch seat depth.
Product weight is approximately 32–34 pounds, depending on configuration and equipment.
Yes. The 24-inch rear wheels use a quick-release design. Once removed, the integrated 8-inch rear wheels can be used for transport-chair mode.
No. Transport-chair mode is intended for attendant propulsion. The 8-inch rear wheels are designed for caregiver-assisted transport.
Yes. The frame folds for transportation and storage, and the back folds down using quick-release paddles.
Yes. Optional elevating legrests are available separately under model WCT4ELR.
The frame has a limited lifetime warranty, while all other parts have a one-year warranty.
Questions before ordering?
Call 866-218-0902 to speak with a mobility specialist.
Mon–Fri 9AM–5PM · Sat 9AM–3PM · Six SW Florida Showrooms
Visit Medical Department Store
Want help selecting the right wheelchair? Visit one of our six Southwest Florida showrooms or call our mobility specialists for assistance with seat sizing, wheelchair configuration and mobility needs.
ProBasics K4 Transformer
One wheelchair. Two ways to move.
Call 866-218-0902 for product questions or help choosing the right mobility equipment.

