I understand that the new rims are design matced to work with 23mm tires. The consequence of having larger sizes means, less of an aerodynamic match and less control feel while cornering. The larger you go off this recommendation the less aerodynamic and less feel for cornering.
But I am wondering how much of affect that really is? I do have 28mm conti on them as a trial, and it feels great compared to 23mm. 25 means something in between. But if I am racing I wonder how much will having a tire size miss -match affect my speed and time?