Re-invent the Wheel: Shower Chair Wheels are Evil

Redo
If you could re-invent something, what would it be? Discuss
why, potential repercussions, or a possible alternative.

Rolling shower chairs are convenient and helpful. However, they become a nuisance when the wheels rust. When the wheel is so rusted, what’s the point? It is almost impossible to move the chair when it’s empty. Imagine having a person who weighs at least a hundred pounds in the chair. It’s almost impossible to get the chair to go anywhere.
Why hasn’t someone made a wheel that doesn’t rust? You would think there is another material that could be used.
The new wheel would have to be sturdy. It also needs to rotate fairly easily. If anyone has any ideas, get busy inventing. Nurses and patients need you!

P.S. Could inventors please invent a brake that works on shower chairs also?

Photo:
http://www.wayfair.com/Briggs-Healthcare-Shower-Transport-Chair-522-1702-1900-MAB1046.html