For the TRON Lightcycle / Run attraction at Disney Parks in 2026, the "body size" constraint is less about weight and more about calf and thigh geometry. Because the ride uses a unique "bicycle-style" restraint system where you lean forward and a bar secures your lower legs, guests with larger calves or a taller "seat-to-knee" height may find the standard Lightcycle vehicle difficult to lock. Disney does not publish a specific "weight limit," but a supportive peer tip: there is a test seat located at the entrance of the queue. If your legs or torso do not fit comfortably in the standard cycle, Disney has a "supportive" solution: they offer a modified vehicle at the back of some trains that features a standard lap bar and traditional upright seating. This ensures that guests of all body sizes can still experience the high-speed "Grid" without the physical stress of the specialized cycle restraints.