In case cops are decent human beings, and these answers are true and the nature of their stop just does not allow them to truthfully tell their victims the reason for the stop, why do they make up funny stories about it like:
In Oklahoma: bicycles need to have same speed as the cars
In Florida: "Someone called us saying that you may need help because you are riding your bike and it is so hot out here. (I am fine, can I leave?) No. Now that I made contact with you I have to ask for your ID. (Why?) Just to make sure you don't have an arrest warrant",
In Skokie IL: "You look suspicious for you are jogging without jogging pants" (I was wearing casual wranglers pants)
..and many more
Are they actually required by law to tell the detainee "a" reason? Why do they not just say "Sorry, but I can not tell you what the reason is"?