@sevoblast: Ideally, I'd like to have a pair each of a range of pinions for testing/selection going from 8-14T. Short of that, I'd like at least to get a pair of 8T, 10T and 12T pinions. The set screws making the testing easier. [8D]

@jaws01: That's looks like an 11T pinion. I looked at the Duratrax website and it looks like they have several tooth options in the DTXC line-up. But, I can't seem to find any of their specs (pitch, hole diameter for motor shaft, etc). Do you know if they all fit the tank motors or what the specs are?