Identifying various parts

Question

I bought a lot of various parts, but I can't seem to identify the following parts.

• The grey wheels have rubber on one side of the axl hole
• I'm thinking that that the black frame-thing isn't Lego, but wanted to be sure before tossing it.
• The white wheels have circular holes, not axl holes.

Answer 1

The 6 black parts on the left might me (used): Tire 14mm D. x 9mm Smooth Small Wide Slick

Answer 2

• I can't identify the black parts.

• The toothed wheel is a string reel spool.

• The rest of the parts appear to have come from a Robotics Invention System set from RCX-era Mindstorms:

  • The grey wheels with a different material on the inside are part 2983. None of those sets have 5 of these, though.
  • The grey bricks are touch sensors.
  • The white wheels are conveyer belt wheels.