Asheck, I'm running a 1512/2.5D neu on a 24t pinion/68t spur on 5s A123(very close to 4s Lipo) and should be right in the 40mph range. The speed calc says 33mph but a bushnell radar gun said 42mph, through grass. It dosen't take much tire expansion to add quite a bit of speed to the top end.

Where did you find the 36-50-2000v2? I would have loved to have saved the 100+ extra bones I spent on the Neu