I have an 18" (I know, not even close to some of these other guys) which claims to be able to take a 1/8" blade, but I haven't ever tried it. I just checked and the laguna 24x24 claims the same, though some other brands only go down to 1/4".
In addition to the wheel crown, the guides are also going to be a factor. Some work with narrow blades better than others.