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We've noted up to a 15% difference between forward and reverse speeds. After some research, I found this has been documented by others in prior years.
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I forget it has something to do with the way they place the brushes. It is called timing. There can either be ccw or cw timing which tells you which direction the motor is turning. They do that with many types of motors especiallly ones where the motors are going to be turning in mainly one direction. Unfournatly problems arise with using motors with the same timing on each side of the robot. It will mean that it tend to go off crocked.
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