When ever I would balance tires, you would have to set up the machine before hand in order to identify whether the weights went on both inside and outside, or just inside. I did a test once and ran the machine both ways thinking that when it went on the inside it would just take both amounts and place them on the inside, I was wrong. Placing them on the inside never caused a problem unless the rim width was greater then 8" or the weight greater then 3.5 ounces. If the customer still wanted the weight on the inside which that much weight requested I would sometimes rotate the tire on the rim hoping that the high spot changed..
Long Live My Bonneville 97 SSEi Dark Cherry