Team Associated RC10 T4 Transmission and Motor Gearing.

 
Each 1/10th scale RC BRUSHED motor requires a certain gear ration in order to run correctly.  Depending on your spur gear, pinion gear and tires size you can obtain faster acceleration, or faster overall top speed.  Keep in mind that changing the pinion gear more than one or two teeth other than listed here may damage your motor or trannsmission.  USE THIS GUIDE AT YOUR OWN RISK!!

The numbers below are starting points, for motor, pinion, and spur gears.  Please Note that this is for Brushed Motors only, and when in doubt check your manual for proper setup.  This is under the assumption you are running stock wheels and tires.

 

MOTOR                                  PINION    SPUR    DRIVE RATIO

24 deg. stock (torque-based)         20            87             11.31:1

24 deg. stock (RPM-based)          19             87             11.91:1

19 turn                                          19             87             11.91:1

14 turn modified motor                  22             87             10.28:1

13 turn modified motor                  21             87             10.77:1

12 turn modified motor                  20             87             11.31:1

11 turn modified motor                  19             87             11.91:1

10 turn modified motor                  18             87             12.57:1

 

If you would like to determine the gear ratio and you already have a pinion and spur gear you can calculate the gear ratio as follows:

    Spur gear / Pinion gear = Result = Gear Ratio

    Example: 81 / 20 = 4.05 = 4.05:1

 

If you would like to determining pinion size based on a given gear ratio if you know the  recommended gear ratio and chosen spur gear size.

    Spur gear / Gear ratio = Result = Gear size (result rounded to nearest whole number)

    Example: 81 / 4.05 = 20

 

If you change tire diameter you can affect your gearing. You can calculate any gearing adjustments by using the following formula.

    Old tire diameter / new tire diameter. = factor

    Old pinion gear x Factor = Result = New pinion gear (rounded to the nearest whole number)

    Example: 2.2" [divided by] 1.75" = factor of 1.257

    20 x 1.257 = 25.14 = 25

I hope this has been somewhat useful to everyone out there.  If you like this guide Please vote YES below.  This is a work in progress, and if you have questions or comments please let me know.  If you would like info on your vehicle please let me know.