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@BringMeMyFix
i) 23mm is what I had 'in stock', and I can happily run them at a pressure which rolls well but gives me all the comfort benefits, great road handling on the surfaces in the lanes, etc. For me @~65kg, it's 80f/85r, which is 10psi less than what I run on 'normal rims'.
ii) I get that flat transition between sidewall and brake track (much vaunted by someone or other (HED?, Zipp?), although the aero benefit this supposedly gives doesn't really interest me.