I never actually ran them other than the front but I did run anything from the old 208s (yep that old) to the 211s and UK Ntecs and I doubt they'll be tall enough to get rid of the spacer... the 195/70 (or was it 65?) probably is but the 55s are really not that different. Even the space under the rear hugger hardly changes... I mean, if total diameter increases by 7mm then you're only really adding 3.5mm but since you run the Ntecs at very low pressures I'm gonna say it would changes even less than that compared to the Pirellis.