The rib tires on my MC-7 tag are starting to crack around the bead and between tread......not terrible yet, but the tires are approaching 10 years old..
I have a mis-matched pair of 12R-22.5 grip tires that are about 6-7 years old that are just aging away in my shed. All my other tires are 12R22.5 matching set.
Any reason to NOT put them on the tag?
They'll just get scrubbed down, running on the tag. Throw about 8-10 ounces of antifreeze in them for balancing and run them on the tag till they're done.