I have that same plane. I use 3.5 inch foam wheels and fly off of grass. Since I am the grass mowing guy I try to keep the grass mowed pretty close though. I have no complaints with that set up. I turn a 12/7 prop with a TT Pro .61 it does well on taxi and take off. I would keep all three the same size even though you'll proably have to buy four. Most I've seen only come in pairs