I bought a 10T pinion and a 9T. The 9T is the smallest possible and I am running it now. Unfortunately this makes my 2nd ESC to burn up. I don't know what happened, I just plugged the battery in and it started to smoke.

I still feel like these ESCs are still in their experimental stage because I hear so much about the lehners and hackers burning up. Maybe when castle releases their esc we won't have problems.