I have a Cateye wireless spedometer. I'm getting a click whenever the sensor passes the sending unit (terms are mine - don't know the actual terminology) on the fork. I've checked and there is no physical contact there. I've pressed all the buttons on the head to see if this is some sort of purposely programmed function (can't imagine why you would want that sound). No other thingys hanging in the spoke to cause that sound.
How can I get rid of it?