Originally Posted by
Thetank
I have yet to find a set of wheels that come stock on a bike that will not handle tire sizes from 23s to 32s. I guarantee you that 23s will fit unless you choose a tire that for some manufacturing error they are too narrow. For instance my cross bike's wheels came stock with 30s, I've had 23s up to 35s without issue.
Yes, 23mm tires will fit, no question, but not optimal for a rim of that width (if it really is the DC19 rim). At any rate, narrower tires aren't going to make the bike faster or make it look any better.