There seems to be two issues here:
1) take the tire off the rim and look at the inside of the crack area. A real crack will show all the way through. ....If the rim is cracked, it's immediately trash. If you absolutely must ride it, at least drop the pressure way down to 50% of normal or so.
2) A cracked tire is a bad tire, with one exception. If the cracks go deep enough to expose a portion of the casing threads, then road grit works down into the cracks and into the threads and then grinds up the threads as the tire flexes (and the tire does flex, as it rolls). The lone exception to this rule is tires on indoor-only (velodrome) bikes, since the question of road grit is absent in their use.