Originally Posted by
prebsy
wider rims allow a 23mm tire to sit better which leads to better aerodynamics, lower rolling resistance, better handling and to you can run lower pressures since there is a reduced chance of pinch flats.
Eh. With 23mm tires, these differences are either very small or just not true. The aerodynamics bit is true but probably very small on shallow aluminum rims, I've raced 23mm rims in crits and they're indistinguishable in terms of handling, there is not a scrap of actual data to demonstrate that rolling resistance is reduced (and the people who've actually tested this, including Zipp, say they're unable to measure any difference), and the reduced chance of pinch flats is just made up. Narrow rims isn't a reason to avoid Ksyriums, the fact that Kysriums are crap is.
Once you go wider with tires, though, especially if you go a lot wider, the wider rims make a much more noticeable difference. With 23mm road tires, nope.