figure.1 :link( http://www.asl.ethz.ch/education/master/mobile_robotics/year2007/S_3a_-_Kinematics_Wheel.pdf )
To take rolling condition, we must know that body motion is determined the velocity of wheel. Therefore, when we transform the velocity of body about reference frame into wheel fixed frame, the velocity must equal wheel's velocity.
To take "No Slip Condition", we must aware that wheel can not move with axial direction of wheel. Hence if we project the velocity of body into axial direction of wheel, the value must be zero.
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