How long will this cracking poly/foam filled tire survive?

[chilly81]

How long you think it will be before I am forced to replace these turf tires + wheels on an old JD750? Badly cracked, but poly/rubber filled. They won't wear out in my lifetime - it will see very low hours, so would love to avoid the $$$$$$$.

What would you think would happen that will finally force me to replace them? And is there anything I could do to prolong their usefulness?

 

[ultrarunner]

Until the tread falls off?

A long time especially at low speed…