I have a kubota l3400f. I want to replace the front ag tires with turf tires. I also would like to know what the tire numbers mean. I've tried to play with Kubota doc's and I come up with different sizes. The parts book says 25 8.50 14. The tractor manual says turf tire is 23 8.5 12. What do the numbers mean? I want to get the rims too. Any help would be appreciated.