I have the BX25D with the R4 tires. I love the tractor and tire combo I use it for everything. Here is my question and when I ask about it I get funny looks and heads cocked sideways with mouth open with no answers. I grow vegetables about 20 acres. I want a set of narrow pizza cutter tires and rims for my BX there is some things where the tires on the BX is just to wide for and I'd like to know if anyone has swapped out the BX tires for narrower tires maybe something like what is on the B6100 or B7100. Any help would be appreciated