Re: no rub tire size
I have run 26X1.75 on two different motorbikes with no chain rub problem.
Also have a 26X1 3/8 coaster wheel I may try.
Limited tire choices with 26X1 3/8, because standard mountain bike tires are too small for that rim.
“You're only young once, but you can be immature as long as you like" -Unknown