These are the proper size scale wheels for the Balsa USA 30% Stearman at approximately 9" in diameter. The full-scale wheels are 30" in diameter. There are six of the wider wheel and two of the narrow wheel (the wheels with "spokes" on the left in the photo). The wide wheels are 3-1/2" wide and the narrow are 2-7/8" wide. The wide wheel weighs 1#-14 oz and the narrow wheel 1#-12 oz. The wide wheels have a 3/4" bore and the narrow have a 5/8" bore. The tires are the same size for either wheel. Hat-section bearings or bushings are available to fit most axle shafts. I used a set of the wide wheels on my 30% Stearman for ten years without any problems, including some very hard landings.
I am offering these wheels for $20 each or $110 for the lot of eight, plus shipping. Shipping weight for all eight is approximately 17#.