I'm an old geezer volunteer who maintains the mowers and lawn eqpt at our Elks Lodge. Among other mowers, we have a Kubota B2100 4x4. Right now it has ag tires on it. Sizes are: 9.5 x 16 and 6 x 12. The ag tires tear up our turf. We'd like to go to a smooth type tread, like many garden tractors have. I've Googled our tire sizes, and find no smoothies. Any tips or suggestions as to how we can end up with smoothies will be appreciated. Who do I go to for these? I'm thinking have two sets of tires/rims so we can switch back and forth as the occasion requires.