THUNDER ADJUSTABLE
$4,595
One chair. Endless possibilities.
The PER4MAX Thunder Adjustable is the most versatile model in the Thunder Performance Series, designed for athletes, adaptive sports programs, and organizations that require exceptional fit and flexibility. Built around a highly adjustable platform, the Thunder Adjustable makes it easy to fine-tune seating position and performance as athletes develop or transition between sports.
Featuring adjustable rear seat height, backrest angle, center of gravity, and lower leg length, the Thunder Adjustable can be configured for a wide range of users and sports. Its modular design makes it an excellent choice for first-time athletes, community programs, schools, rehabilitation facilities, and anyone seeking a high-performance chair that adapts with them.
Why Athletes Choose the Thunder Adjustable
- Designed for athletes, teams, and adaptive sports programs
- Custom-built to each athlete's measurements
- Highly adjustable fit for multiple sports and users
- Adjustable rear seat height, backrest angle, center of gravity, and lower leg length
- Lightweight rigid-frame construction
- Handcrafted in the USA using premium materials
- Aircraft-grade aluminum construction
- Precision-machined PER4MAX components
Every Thunder Adjustable is handcrafted in the USA to deliver the responsiveness and durability expected from the Thunder Performance Series while providing industry-leading adjustability. Whether you're building a community sports program or dialing in the perfect fit for a growing athlete, the Thunder Adjustable offers unmatched versatility without sacrificing performance.
Standard Features
- Custom-built aircraft-grade aluminum frame
- Powder-coated or polished aluminum frame finish
- Rigid 5th wheel
- Adjustable center of gravity
- Adjustable rear seat height
- Adjustable backrest angle
- Adjustable lower leg length
- Average weight: approximately 19 lbs.*
- Black nylon upholstery
- 3-inch front casters
- Impact-absorbing backrest bar foam
- 2-inch foam cushion
- 3-year limited warranty
Every PER4MAX wheelchair is built to order. Available features and configurations vary based on the selected sport, athlete measurements, and individual performance goals.
Available Options
- Ultra-lightweight 7000-series aluminum frame
- 5/8-inch axle
- Removable 5th wheel
- 6th wheel configuration
- Adjustable rear caster stem set
- Spinergy wheels (SL, SLX, X-Lace, R10)
- 12-tab handrims
- Custom footrest adaptations
- Custom powder coat and color combinations
- Click straps (lap, foot, and waist)
- Leather upholstery with air mesh
- Tension-adjustable backrest upholstery
- Tension-adjustable backrest
- Carbon fiber accessories
- Solid seat plate
- Solid 2-inch foam cushion or custom seating options
- Continuous backrest
Contact the PER4MAX sales team or download the order form to begin designing your custom Thunder Adjustable.
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EVERY CHAIR STARTS WITH YOU.
From frame to casters — and everything in between — customize the perfect chair for your needs.
Use our configurator to explore colors, options, and accessories. Our team will help you finalize your build.
LOOK GREAT, FEEL GREAT
Create your own look and customize every component of your new wheelchair.
LIGHT WEIGHT AND UNSTOPPABLE
We use the lightest, strongest materials to craft your chair with precision, then we rigorously test it.
GOLD MEDAL STANDARD
Our chairs are built, tested, and used by champions and Team USA athletes competing in the Paralympic Games.
MAXIMIZE YOUR ABILITIES
Work directly with our expert team to customize your design and configurations for maximum performance, on and off the court.