Originally Posted by
rpenmanparker
I did not mean to contradict your explanation. It may indeed be that there is some effect of less rubber in between the threads. What I know for sure is what I said: more, thinner threads are more flexible than fewer, thicker threads.
The majority of the effect is because of less rubber in the carcass. The flexibility of the minute size difference of threads in a tiny bike tire is irrelevant. It's not even something that would need research, it's kind of a no brainer.