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I have been doing some research, and came up with this:
The KIT racer gear ratios are:
Idler gear teeth: 16
pinion gear teeth: 7
Now, for the gearing sets differences:
3.43:1: Spur teeth=18, center idler teeth: 12
3.95:1: Spur teeth=19, center idler teeth: 11
4.57:1: Spur teeth=20, center ilder teeth: 10
Now, if you had a 6T pinion gear, then the gear ratios wold become:
3.43:1 to 4:1
3.95:1 to 4.61:1
4.57:1 to 5.33:1
I tested these ratios with my motors. See, a ZZ motor is kind of bigger than the KIT motors and thus, they need a smaller pinion gear, 6T, to turn the KIT gears. So, I used an NX motor with the 4:1 ratio and got a real 6.64 mph, where as if you used a 2.6 motor with the 3.43 set, it becomes a real 5.92 mph. You've heard this a million times from me, and I'll say it again. The yellow ZZ motor with the ZZ red gears can beat the NX motor with the blue gears, so use as low a gear ratio as you can and use as high a motor rpm as you can. the four things that help speed factor are the motor rpm, the gear ratio, the wheel circumference, and the weight the car is pushing.
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