OK, I won't waste time digging up answers for your many unending questions. If my "guesswork" is not good enough, then I guess that you should do your own guesswork.
ellysbro,
I appreciate you're digging up answers, and anyone else that's digging also. so, for their and your assistance, thank you all.
I did mention I'm really looking for correct specifics.
This is why I asked for the "actual" main wheel tire size. Knowing the true or actual and correct tire size would eliminate guesswork.
I would like to draw the gear once and do it as correctly and as accurately as possible. And I would like to draw it full size.
What's the point in putting in the work to do the drawing any other way? It takes a considerable amount of work to draw a mechanical, that can be used as a blueprint, to fabricate working retract gear.
Conversation, help and ideas is needed and appreciated.
Charles