With the tires that you see in the pic, I was geared 12/44. The only thing that concerns me about the A123s is that 10 cells weighs in excess of 700 grams. That's more than a 4S2P 8Ah pack. I just don't know if the capacity to weight ratio is worthwhile. I won't know until I can get an actual real world runtime on the A123 2P pack.