Comparing rotating bodies

[Gmaximus]

If there are two rigid bodies rotating, (known I) how can you compare their rotation?

Example:

If the object of moment of inertia I is spining at x rad/sec, and its I is changed to i, what is the new speed?

[Doc Al]

If the object of moment of inertia I is spining at x rad/sec, and its I is changed to i, what is the new speed?
Assuming that no external torque has been introduced, angular momentum will be conserved. So I_1 \omega_1 = I_2 \omega_2.