In order to find the maximum bending moment on the arms, it is assumed as a

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The maximum bending moment on the arms of wheels, gears, or pulleys is typically analyzed by assuming the arm as a cantilever beam. This beam is considered to be fixed at the hub (where it connects to the central part of the wheel or gear) and carrying a concentrated load at the free end (the rim). This assumption is used because it closely models the real-life conditions under which these arms operate, with the load being applied at the rim and the arm fixed at its base.

In Order to Find the Maximum Bending Moment on the Arms