Cyclists may sound familiar (4,1,4)
I believe the answer is:
ring a bell
I believe this is a double definition.
'cyclists may' is the first definition.
(a cyclist might ring a bell)
'sound familiar' is the second definition.
(something which seems familiar rings a bell)
(Other definitions for ring a bell that I've seen before include "Beginning to arouse a memory" , "Call for servant" , "start to arouse memory" , "Make a chiming sound" , "may awaken memories" .)