I've been having issues with my handlebars slipping on my cyclocross bike, so I was thinking about replacing them because I don't really like them anyway (a bit too narrow, drops too deep, etc...). I think my stem diameter is 25.8 (It's a Ritchey stem). I have no idea about the diameter of the current handlebars.

Can I use a 26.0 diameter handlebar with this stem or do I have to get something 25.8? It looks like I have many more options in 26.0.

Thanks