Originally Posted by BCMPOWER
Like KingKye stated you can transfer them, but it's more convenient to have them purchased as a wheel and tire set and have them mounted and balanced at tirerack. That makes it easier to keep the 18's for later use like for all season, snow or even track tires. Yes they can be transfered, they are a universal design, they are just senders of the tire pressure the on board computer makes the calulations.
Thanks BCMPOWER, I appreciate your info! I understand the concept now...I will more than likely buy new TPMS sensors with my 19" wheel/tire combo and save the 18" set in case of an emergency. Thanks guys!