Sort of a ho hum day. The closest wheels (Alumastar, that is) i can find measure about .660” o.d. That means the I.d. of the tires i have in my parts box have to be opened up about .060”. Well, after scrounging around, I came up with a 5/8” (.625”) drum sander. By “drilling” it out, holding the tire with one hand and drilling with the other, a shaky proposition, and not one I recommend. Then, working the drum around the inner circumference of the tire (a tedious procedure with lots of measuring thrown in) we arrive at an I.d. of .660”. I am not thrilled with this procedure, as I would like to “make” about 15 of these for future Stocker projects. I am considering using 15 and 16mm sanding flaps. If anyone has any better, simpler, safer, etc., ideas , I am all ears. I also did some sanding on the sidewall of one tire to more closely approximate the racing front tires used on Stock and Super Stocks. They are smooth and have no side tread ribs. Oh, yeah, I did find in my cheapie Harbor Freight grinder a 3/8” drum sander that you walk around the circumference of the tire a little easier but, kinda slow going.