My 1/4" Makita has six speeds: 1 = 10,000, 2 = 12,000, 3 = 17,000, 4 = 22,000, 5 = 27,000 and 6 = 30,000.
Router bits e.g. Trend have a marked max RPM e.g. a smaller bit might be limited to 28,000 - so setting 5 gives a bit of safety. Perhaps the quoted speed drops a bit but it's wise to play...