Are R4 rims adjustable? My R1s are, of course, but I don't know about R4s. CrazyQ, on my Kubota the rims are just as John outlined above, and it can get a little hard to visualize and in some cases you have to remove wheel center, flip it and bolt it back to a different set of tabs on the rim. This really isn't difficult, but, the way mine came from the dealer, you could just swap sides with the whole tire/wheel/rim assembly for a wider stance. This is very very easy, just move the right one to the left, keeping the 'arrows' in the tread pattern facing forward. This simple change could move the high point of the tire (the center) out from under the fender altogehter.