UPDATE ON BICYCLE GENERATOR

A few days ago I was merrily pedaling away when the roller wheel on the shaft from the generator motor broke off.  I blamed the failure on the fact that the shaft of the motor was bent so I called one of my favorite neighbors who I knew would love the challenge of helping me figure out how to make the generator work.
When we talked on the phone he said it was no problem to straighten the shaft so just bring it on up.  To speed things up, I took the motor apart before stopping by.  John, my neighbor, checked out the shaft and it was dead on straight.  Very mysterious but he had fun accusing me of drinking too much.  I let him play with me.  I suggested that maybe the way the motor was put together was the cause so we put it back together and it stayed straight.  I have no idea why it had a wobble but it no longer does so I'm happy.
I also asked John to help me figure out how to get the motor shaft and the tire relationship to work.  We talked it through for a while and then pulled a small pulley wheel off of the wall and attached it directly to the motor shaft.  I was concerned that the pulley wheel would cut the tire since the edges are sharp so John wrapped a load of rubberbands around the wheel hoping that they would distribute the pressure onto a larger surface area.
I took the motor home and set it up on the bicycle trainer.  The rubberbands didn't work so I took the pulley wheel off and filled the groove with epoxy putty which hardened into what so far seems to be a great surface.    Original version:

Check out this photo so see the new improved drive wheel.