"Ned Simmons" wrote in message
...
SNIP
| Would you still say that the number of revolutions per mile that tire
| makes would vary with the air pressure in it, or as you put it "the
| effective radius".
|
| I think Carl has explained the paradox. Imagine that as your inside out
| timing belt engages with the rack it develops a bubble in the center of
| the engagement such that there are x+1 pitches of belt between x teeth
| on the rack. The overall length of the belt hasn't changed, but its
| effective length has been reduced by one tooth.

Thank you for making it clearer than I did. I was so wrapped up in the
big picture I missed the simple explanation!