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No its more like 25-26mm wide on the rim. I said it, because gp 4000s appear to be true to size where as rubino pro are a bit larger than their official sizing. Sorry for the confusion.
rubino pro 23mm on aerowarrior -> 21mm high 25-26mm wide
gp4000s 23mm on aerowarrior -> 20mm high 24-25mm wideboth -> work fine!
svenhöek
It's more like 24mm because it's on a fat rim. As I said fairly recently, you can use 700×20C tyres on rims which are 24mm overall width, but you'd only do so if you were sure that there were aero benefits which easily outweighed the extra rolling resistance and all the other costs.