Thanks for the warm welcome, everyone!
I like those tires too. Unfortunately they're badly weathered, so much so that they all have cords breaking out.
If I find a set in good shape, I may stick with them, but 6 months ago I got a crazy deal on brand new Carlisles directly from Cub Cadet Canada for under $70 each. They're over $300 today! Insanely good luck!
So the plan for the moment is to also get some Carlisle ribbed tires for the front (my perfectionism compels me, lol) and sandblast and paint all the rims.
I also have a set of ribbed ag tires on a set of other rims for doing ground engaging work, but that's for another topic.
Some more info about me. Other tractors I like and would consider owning: 1st or 2nd generation Sears Suburban, Allis HB,700, and 900 series hydros, and my unicorn, GE Elec-Trak. (Excuse me while I wipe the saliva off me keyboard
)
I'm a fan of good, or at least interesting, industrial design, and the 123 Cadet ticks so many boxes: a most elegant, robust design, with great parts availability, high functionality (the hydro and hyd. lift are fab, especially in my small yard), and with a compelling effort to artistic effect. So far I've blown snow, graded gravel and dirt, pulled trees and cement pilings, moved soil and mulch. I'm also looking for a moldboard plow and a chipper shredder at some point.
I restore a lot of things (old cars, motorcycles, radios) and I'm really enjoying the garden tractor hobby. It's so so much more than what I expected, and I look forward to sharing more of my stories. From reading various forums, I get the impression that it attracts some of the nicest people too. Thanks again!