When you use the drivetrain class (or similar), the algorithm used by the
turnTo (or similar function) is to calculate how far to move each wheel. This is done thru the following formula:
TurnInRadians = (LeftWheelDistance - RightWheelDistance) / trackWidth
trackWidth is defined as the distance from the left wheels to the right wheels. WheelBase would be the distance from the front wheels to the backwheels.
One method would be to program the robot to turn 720 or 1080 degrees and change the track width until you observe the robot turning the correct amount. Physical measurements are a good starting point, but reality can intervene, and experimental results work better.