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Originally Posted by jeffmorris
The Vex Robotics Kit doesn't have castors for making wheelchair-based robots (two large driving wheels and two castors). Any suggestions for castors that fit the metal parts? The holes on castor mounting plates should be the same size and spacing as the holes on the metal parts.
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I don't have an answer to your question about buying casters... however:
A free spinning omni-wheel provides the same properties of the caster. This is one option you could use.
If you don't want to purchase omni-wheels, you can take the rubber off the standard small Vex wheel, it will slide along the floor with very little friction, and also behave like a caster.
Another option is to build skid-plates. Many of the plastic parts in the Vex kit are great for this purpose (the Vex pillow-block comes to mind).