Nope, the GReddy Pulley kits never change the crank pulley, only underdrive the accessories. I've already gone through the whole crank pulley experience with the Unorthodox Racing set and went back to stock crank pulley...
I think you're thinking of the lightened UR pulleys, they are the same as stock diameter but the Greddy set is an underdrive set so they are a little larger. Unless my eyes are fooling me, maybe I'll double check the diameter just to be sure I'm not talking out my ass.
The pulley set for the RX-7s actually comes with a belt but that's because it underdrives the alternator and the water pump and eliminates the air pump.
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