New comer - asking for gear ratio

[henryb4sun]

hello,

I am new comer on the off road racing and just got a CAT SX. I don't have the box near me now but I want to ask.

1)What is the spur gear and idler gears comes in the box?
2)I am going to use LRP X12 9.5T Brushless motor plus Speed Passion GT2.0 LPF speedo. What is the pinion gear you will suggest and overall gear ratio? I will play the CAT in a sand/mud road.

Thanks!