I have 26X12X12 Multitrac tires on my Ferris 5100z and am looking(unsuccessfully) for a slightly more aggressive tire. The multitracs load up too quickly and don't hold well on hills. The property I mow is not all residential lawn, more like 5" athletic fields so I can handle a more aggresive tread without too much marking. Does anyone know of a suitable tire in that size? A paddle tire would be nice or a more aggressive tread than the Multitracs.