The noise sounds like two metal objects gently colliding and it's there when the bike is starting to move or is nearly at stop (low speeds). It disappears at over 3~40km/h and is silent at idle.
This noise started when it felt like I've ran over a small gravel coming to a stop. I first thought it was a nail but I couldn't find anything. My second guess was that something became loose but no luck either.. Can anybody give me an suggestion on this?