Originally Posted by
CliffordK
..t:
I wonder if that is a reason that many wheelchairs have angled wheels, so at least if the bottom part of the wheel goes through, it will push the chair over a little bit.
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The angled wheels are to improve ergo dynamics. The more angle, the better the hand motion on the wheel lines up with your shoulder muscles. But that angling has the drawback of widening the chair so serious uses often have several chairs so they can use the widest, most angled wheeled chair that works in the environment they will be in. Typically, they need narrower chairs to go to work. A lawyer working n an old building might have a very narrow chair built to just fit through the narrowest door and a nice comfortable, wide chair for his home that is designed for good wheelchair accessibility.
Ben