I had the 200mm on my 1/4 scale DP SuperCub. Cant recommend them enough. They fit right on the Dubo hub if your running 6" dubro inflateables. They are expensive but look awsome for someone who wants that Bush Plane look.
They are always outta stock but show up once in a while befor they are sold out again. These pics show a direct comparison to the 6" Dubro tires.