Rim and Tyre 1/28 scale (25 mm) for K969, K989 etc.

RC wheel and tyre for RC cars in 1/28 scale, particularly WLToys K989 and K969.

Print in 0.1 mm layer height. Works with 0.4 mm nozzle, but 0.2 mm nozzle preferred. Post processing often required, remove strings by hitting it with a torch. The mating surface to the car should be as smooth as possible, for this simply heat the backside of a screwdriver bit with a torch and press it flatly to the surface (using a drill press works best).

Supports required, tree supports work well. 

Fuzzy skin on the tires can alter the grip properties, play around with it and see what you like best.

Assembly is simple - objects can just be snap-fit together. use two flat surfaces to apply even pressure (i.e. Table and book).

Can be printed per - object.