When an attendant releases the locking mechanism and rocks the chair back on its rear wheels the casters swing down and maintain contact with the ground. It can be locked at twelve degree intervals, from zero to twenty four or six to thirty, depending upon the chair's configuration. The tilt system only adds five pounds to the weight of the chair, and the chair can easily be restored to its original configuration. The manufacturer recommends the tippers with the tilt system. I had some concerns as to the durability of some of the joints in this mechanism.
More models are on the way.
The new talk in the powered wheelchair market is mid-wheel drive chairs. In the past few years, these six-wheeled chairs have been the chair of choice for people who need to get in and out of tight spaces. To accomplish this, the chair is constructed with the drive wheels in front and the small caster wheels in the rear. Another set of small wheels in front of the drive wheels prevents the chair from tipping forward. That makes a total of six wheels.