Neu 1512 vs. 1515

Well, I went with the Neu. Since Mike's been out of stock on most of the Neus, I went shopping around, and I found a deal on a 1512 1.5Y that I couldn't pass up. I hope it works out.

I just weighed my truck with a the 9XL and heatsink and a 4S2P 8Ah pack and it came in at 10lbs. 6oz. Getting rid of the 9XL and associated heatsink and perhaps being able to go to a 6Ah pack, I should be able to bring the total weight down below 10lbs.

So...does anyone know what a good 35mph gearing would be for my 8ight T with the 1512 1.5Y?