I just received my Frey Runner and am loving it so far. I got the 1000w rear hub motor. The computer is a DPC-18 and I noticed it is programmed for 29" wheels, but I got the 27.5 inch. It doesn't appear I can change this directly in the computer. My two questions are 1) If I don't change the wheel size in the computer, won't my mileage, MPH, etc be off? 2) Can this be reprogrammed? I see programming cables, but only for mid-drive.