1. When measuring the "wheel", do they mean the outer diameter (OD) of the Wheel/Rims or the Tires? I got:

7" (177.8mm) for the rims

11.5" (291.1mm)with the tires.

2. According to the instructions, to multiply the diameter in millimeters by 3.1416 to get the wheel factor. So I got:

7" -> 177.8mm x 3.1416 = 558.57648 (wheel factor)

11.5" -> 291.1mm x 3.1416 = 914.51976 (wheel factor)

3. Which one is right?

4. Do I round it up to the nearest ones and enter it?

I apologize for all the questions but I can't seem to set it up right and I've been trying to set it up for 4 days now. Thank you in advance.