[abugiacomo]

i recently bought an e90 (2009) m3...i'm replacing the 18s that were on it with a set of 19s (220s) from an '09 e93...i'm buying the 19s sans tpms sensors, but i assume that i'll simply be able to use the tpms sensors from my 18s -- is that a correct assumption?

generally speaking, i'm wondering how the tpm system works (at a high level) and what components it's comprised of (i know about the sensors in the tires, but i've also heard about sensors in the wheel well...do cars generally have either-or?...both?...are there other parts of the system?)

thanks in advance!