I had 21" with RFT so ride should be similar to 22" with non-RTF. Of course air suspension make difference compare to M60. Currently running 19" with RFT for winter.
Ride quality of 21" itself was pretty good and I think it was more quiet than 19" tires.
But what I did not like about 21" is how it reacts to medium to big pot holes. Hitting pot holes in NYC makes me think suspension will break prematurely. With 19" I feel it much less.
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