The rear tires are 6-12 off of a David Bradley's. The tires did slightly clear the fenders once they got tucked under the fender lip. I was worried about them still hitting if they got filled with mud or whatever. To help this issue and not cut the fenders from the pan I just installed 1/2 inch bushings on top of the tranny where it mounts to the frame. This lowered the trans/axle down and made me feel better about it. To install that style wheel on this tractor I found rear hubs off of sears, or wheelhorse (Im sure there is more) that had 1 inch shaft size and they slide on and have a keyed slot and set screws. All the mods on this tractor went very smooth and was pretty easy. If you have any other questions just ask.