I’m not experienced in durometer so I’d like something to compare it to (average automobile tire, average dolly tire, KOP wheels, etc). What type of common tire/rubber would be similar to 65 Shore A durometer rubber? Thanks.
Look at the McMaster-Carr site. Use the find-products field to search on ‘polyurethane’. Scroll about halfway down the page and you will find a graphic that describes durometer range using examples of various points on the scales for Shore OO, Shore A, and Shore D. [there is probably a faster way to get there but the above is easy for me to remember right now.]
Shore A 65 is considered medium-hard, somewhere between tire tread and shoe heel in hardness.
kinda like a rollerblade wheel, but probably a little softer.