those are some nearly new 13.6-28 I stumbled upon.. still have whiskers on them. and yeah.. I got lucky.. those PA rims were next to perfect. just had to wire wheel surface rust off and replace a lil bit of hardware.
laoded with water and eco safe antifreeze.
I think I only have 1 machine left with calcium in it... i usually swap them out to water and eco safe antifreeze when I do tire work.
she has been dirty. earlier this year I had to rebuild the top end after my pushrods stuck , bent.. etc.
she's a great mowing tractor..