For most power wheelchair users, a flight of stairs is still a hard stop. Ramps help when they exist, but buildings without them — older homes, public spaces, entrances without accessibility infrastructure — remain genuinely inaccessible. XSTO, a mobility technology company, is addressing that gap with the X12, an electric all-terrain mobility robot that uses a hybrid wheel-and-track chassis, LiDAR sensors, and an AI-guided control system to navigate stairs, slopes, grass, gravel, and uneven surfaces. It is not a lightweight commuter chair. It is a heavy-duty platform built for users who need reliable access across a wide range of environments — indoors and out.
Where the technology starts: Three drive modes
The X12’s core capability comes from its hybrid quad chassis, which operates across three distinct drive modes depending on the surface being crossed.
In Quad-Wheel Mode, all four wheels operate with independent suspension for smooth travel on flat indoor floors, ramps, grass, and gravel. This is the everyday mode — quiet, stable, and maneuverable in tight spaces. When the chair encounters stairs or curbs, it shifts into Hybrid Wheel-Track Mode, where rubber tracks and wheels work together to manage the transition from flat ground onto a staircase. For more demanding surfaces — wide gaps, extreme terrain, or steep inclines — Dual-Track Mode engages both tracks simultaneously, driven by high-torque motors.
Mode switching is handled automatically. The system detects stairs and shifts modes without requiring manual input from the rider, which the company calls Smart Mode Switching. Alongside this, Precision Power Matching adjusts torque output in real time to match the demands of the terrain, and Auto Drift Correction monitors the chair’s climb trajectory and makes self-corrections to keep it on a safe line.
Stair climbing: How it works in practice
The X12 climbs stairs at up to 25 steps per minute going up, and 30 steps per minute descending. It is compatible with steps up to 200mm (about 7.9 inches) high and staircases with an inclination of up to 35 degrees — dimensions that cover most standard residential and commercial staircases in the U.S. and Europe.
The system uses LiDAR sensors combined with a proprietary AI algorithm that continuously adjusts the chair’s angle, mode, and power output during a climb. XSTO describes this multi-sensor fusion approach as “fusion perception” — the chair does not simply follow a fixed mechanical program but responds dynamically to what it detects in real time.
In wheeled mode, the X12 handles ramps up to 15 degrees. In tracked mode, that climbs to 40 degrees — a slope steeper than most building ramps and comparable to challenging outdoor terrain.
The chair can also cross gaps up to 180mm (about 7 inches) wide in wheeled mode, and up to 300mm (about 11.8 inches) wide in tracked mode. Front obstacle clearance is 100mm; rear clearance is 220mm.
The seating system: Adjustability across multiple axes
Beyond terrain capability, the X12 incorporates an adjustable seating platform that can be configured for different activities and postures throughout the day — something that becomes practically significant for users who spend extended hours in the chair.
Seat height adjusts across a range of 490mm to 762mm (roughly 19 to 30 inches from the ground), allowing the rider to position themselves at desk or table height, reach higher shelves, or interact with other people at eye level rather than looking up. Tilt adjustment spans from -8 to 40 degrees, accommodating reading, dining, general sitting, and prolonged rest positions while redistributing body weight to reduce pressure buildup. Recline adjustment runs from 90 degrees (upright) to 121 degrees, allowing a more relaxed position for conversation or rest.
Seat depth adjusts between 380mm and 435mm; seat width between 390mm and 440mm, accommodating a range of body types without requiring custom fabrication.
The X12 also features 360-degree dynamic leveling, which keeps the seat platform level on complex or uneven terrain, so the rider does not experience the chassis tilt directly. A Rocking Mode and dual-access boarding configuration are also included, the latter making it easier to mount and dismount the chair from either side.
On the standard X12, legrest adjustment is manual. The X12 Pro upgrades this to electric legrest control, which is the primary functional distinction between the two configurations.
Build and battery
The X12 supports a maximum user weight of 136kg (approximately 300 pounds). The chair itself weighs 115kg without the battery (116kg for the X12 Pro) — a figure that reflects its heavy-duty chassis and dual-battery system rather than portability. The frame is foldable for transport and storage, with folded dimensions of 1,200mm x 685mm x 617mm (approximately 47 x 27 x 24 inches).
Power comes from two lithium battery packs, each rated at 25.2V and 25.6Ah. On a full charge, the X12 delivers up to 35km (approximately 22 miles) of range on flat ground — enough for a full day of mixed indoor and outdoor use without needing to stop and charge. Charging takes approximately 6.5 hours per battery, and both batteries charge simultaneously. Top speed is 12 km/h (about 7.5 mph).
The frame carries a 5-year warranty. Battery warranty is 1 year.
A note on practical limitations
The X12 is not designed for solo transport in the traditional sense. At 115kg unloaded, it is not a chair a user can easily put in a car trunk or carry up a flight of stairs without the chair’s own stair-climbing system. It is intended for users who need a capable, long-term daily mobility platform — particularly those in environments where stairs and uneven terrain are a consistent part of daily life rather than an occasional obstacle.
As with any sensor-dependent system, real-world performance on stairs and complex surfaces will depend on specific staircase geometry, surface conditions, and individual use cases. XSTO’s stated compatible step dimensions — height under 200mm, inclination under 35 degrees — provide a practical reference point, but users in older buildings or non-standard construction environments should verify compatibility before purchase.
Pricing and availability
The XSTO X12 is priced at $29,999 USD, reduced from a listed original price of $42,999 USD. The X12 Pro, which adds electric legrest control, is also available. XSTO ships to 35 countries with free express shipping and lists limited stock in a U.S. warehouse, with an estimated delivery window of 5 business days for domestic orders. A 30-day risk-free trial is offered. The full product line is available at the company’s official website.
Product page: XSTO Mobility
