I bought these caps because they looked good. Although my tires are R15, I had trouble fitting them as the locking ring made installation difficult. When I tried to push the cap in, it cracked. I ended up having to get my wire cutters and trim the locking ring to fit my tires without breaking them. However, it doesn't end there. After riding them for a day or two, two of them broke just from riding in them, so I'm now stuck with three ripped wheel covers. I wish I'd thrown away my shitty old hats; They were even better than those hubcaps.