Oops sorry, I only said 24t, I had no intention of using it lol. I have no clue what the motor will preform like so I think I will get a couple pinions to try to get a happy medium. Also I think that I will be using the 9xl so that I have a few more battery options. Is that your dog? I like em because the first dog I can remember having was a Bouvier he was blonde and he made me love big dogs and woolly sheep dogs. lol