What's that, 2650Kv's in the building?

[SpEEdyBL]

Lets forget about the calculations for now. How do you know a 15 tooth is the right pinion. It could be a 12 tooth and calculated speed would only be about 55 mph. I think Edumkated radared his 1512 1.5D on 4s on 5s and he had speeds of 60 and 70 mph respectively. The Castle-Neu 2650 on 5s has about the same rpm as the 1.5D on 4s.

I plan to run the 2650 on both 4s and 5s for bashing. If you have to use this motor for racing, a high capacity 3s pack would be more suited. If only Castle came out with a version of the 1512 1.5Y, that would be great for racing on 4s-5s.