I have a Ford 1900 tractor. I use it around the farm for small jobs. Im having problems with flats. I have Mesquite Trees on this place and i run over quite a few. I have the front tires foam filled no flats but tis hard on the drive train. I could do the same to the rear tires but really dont want to if I can help it. Iv researched Ultra-Seal but they tell me that it may or may not work with Mesquite thorns. So I researched aircraft tires. They dont make aircraft tires 12.4 x 24. So Im open for suggestions. What do I do? Thanks for all your help. Randall Lovelace Zephyr Texas