My car came with 19" Continental all-season RFT's, and now I'm running 20" Pirelli P-Zero summer RFT's.
IMO, they feel about the same and both feel good on the road. Good grip, quiet, and zero vibration at freeway speeds.
The only thing I don't like is that the P-Zero's have a tread wear rating of 220 and the Continental all-season tires are 400, so it's going to get expensive changing out those 20" tires more often.
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