Originally Posted by
Stanfsu
Hey Marv,
I also just picked up on one these. I am running a 17.5T BL motor using 64P gears. What what spur and pinion would you use? Final FDR? I was thinking of 4.5?
That's a good question Stanfsu and it deserves a good answer. Unfortunately, I don't have one.
My intention is to run my S2S in VTA & TC once I get it tightened, I get my skill level back up and I upgrade to the 25.5 motor & esc.
I still have the OEM brushed 15T Firebolt and esc in mine.
Right now I'm geared at 4.56 using 48 pitch 84/39 & that gets me around the high school tennis courts for now.
OBTW, when calculating your FDR the magic number for the equation is 2.13
Example: (122/35) X 2.13 = Final Drive Ratio of 7.42
This link might be helpful - Gearing a Sprint 2 for VTA -
Last edited by Marv; 07-20-2012 at 02:16 AM.