Ah, well that's what I get for a quick ride and not knowing anything about the bike I was on. I didn't realize the wheels were 650B.
Update, Leah: You might fit a 50! -- You received this message because you are subscribed to the Google Groups "RBW Owners Bunch" group. To unsubscribe from this group and stop receiving emails from it, send an email to rbw-owners-bunch+unsubscr...@googlegroups.com. To view this discussion on the web visit https://groups.google.com/d/msgid/rbw-owners-bunch/61286a2b-1703-4576-915d-a059990afa25%40googlegroups.com.