Yes, I mean rim width.

So cyclocross/hybrid rims are the same width as road rims? I always thought they were wider since the tires are wider.

I'm pondering a frankenbike as a second bike. I'd like something like cyclocross functionality, but don't need the higher BB. I'd also probably use it as my commuter (and let DH have his mtn bike back), so like the idea of a lighter steel bike that's not too terribly beautiful (so it doesn't get swiped). It's just the glimmer of an idea, but there's some really cute mixtes on CL (like this) and I was pondering if I could do wider rims or tires on one of those.