brushless 1/10th truggy (help and opinions?)

[rootar]

well, what are the ratios for this truck (diffs and the center is a 54 tooth spur right) im trying to figure out my pinion gears to order im thinking a 12 or 13 and then a 14 or 15 for my other, ill prolly grab a set of masher2ks later on for bashing. i guess i need the exact specs on the motor too. just dont wanna buy the wrong pinions since they are 12 bucks a piece.