1. The problem statement, all variables and given/known data 2. Relevant equations tao=Tc/J theta=TL/JG 3. The attempt at a solution I got the torque of the motor as 210,085lb-in Then I converted the 4* to .698 rad From there I plugged it into the equations. I solved for T from tao=Tc/J then plugged that T into the theta=TLJG and put everything else in there. When I did that I got a diameter of 3.44" or 1.72" radius. I don't get what I'm doing wrong?