I'm looking at some wider rims to replace my RS80s. As the RS80 rims are about 15mm internally pretty much anything is going to be wider.
External width is irrelevant I think but internal width on 'wider' options runs from 17 up to 20mm. I imagine there will be an optimum width for a given nominal tyre size.
I intend to mainly be wearing 25mm Conti GP4k (28s I will use occasionally). So at the moment I'm thinking 18mm internal width will be a good choice with the 25s (Hunt's Race Aero current favourites) but what is the wisdom of the crowd/herd?