Hello all, this will be my first posting. Alittle about my pede it has Tmaxx wheels, a 9t speed gem, super rooster, converted 6 cell 3000 mah nmh to a 8 cell. losi springs, hot bodies a-arms and shocks. okay so enough about my little girl. My main problem is gearing. I run to the hobby shop where this guy tells me to divide the spur by the pinon but what does this number mean? What is the best gear ratio for high speeds but will give me enough torque to move these tires? I keep going back and forth trying gears but I cant seem to get it right. Before I put these bigger meats on I was able to put about 10 car lengths on my bestfriends Tmaxx I was at the time running a 12 tooth pinon with a 92 tooth gear spur, but I need more. I hope you all can help me out. thanks guys and gals.