Castle 1415 suggested gearing

[bruce750i]

No but they are also considering 2s voltage with the 2650. http://www.castlecreations.com/suppo...ring_chart.pdf
I often operate in the omgwtbbq range

[Bmr4life]

Take the 1415 and the 1512 on the Hyper 10SC for example. Biggest battery with smallest pinion

1415 on 4s with the smallest pinion would be 14.8 x 2400 x 10 = 355,200.

1512 on 4s with the smallest pinion would be 14.8 x 2650 x 11 = 431,420.

I'm assuming CC followed the standard thought process; higher voltage means smaller pinion, but perhaps they didn't.

Looks like there had no speed goal other than highest speed safely possible with these gear ratios, but I doubt that because a 2650 could EASILY handle a larger pinion on 4s in that truck.