most of our tractors have calcium in the tires,I would not put antifreeze in the tires, if seen were a tractor was put in front of the cows and the cows chewed the valve stem of, if that was antifreeze ,you could have a bunch of dead cows,it tastes sweet and animals like it and it doesn,t take much to kill them. we are getting away from liquid in tires ,because of added cost to repair,it takes time to pump out the calcium and put it back, I like wheel waits beter