From the discussion on the GTT forum, the consensus there is the turf tires are best in snow. You can purchase the turf tires mounted on wheels from greenfarmparts.com, PN: LVB25850. I don't know if they have a discount for MTF, but they do for GTT (GTT is the code). They also have free shipping promos you can combine with the GTT promo from time to time. Its kind of pricey, but it is nice not having to dismount your R4s in the event you need to switch back for some work in the dirt.