Wheel Sizes

[Emster]

I have a flat car with plastic wheels that I would like to convert to metal wheels, but I don't know if I get the large wheels or the small wheels. Does anybody know?
Emster

[on30gn15]

Large ones match both the metal ones on current out-of-the-box cars and plastic ones on a second hand bobber caboose bought last year.

Therefore large would be the ones to go with.

Think small ones are for those 4-wheel ore and mine cars.

[Barry BBT]

The small wheels also are used on the 20.3 Twenty foot cars, Great looking small trucks.

Barry - BBT