At least I think it is call the Headset, the bearing the handlebar stem turns within? It has recently become a little notchy, it appears to very gently click into its forward position, i think I may of damaged something taking my road bike on farm tracks. The bike feels entirely normal to ride and the notchy sensation is only noticable when the bike is stationary and the handlebars are turned from side to side. As I won't get round to fixing it for a while, how safe is the bike to ride? could there be some sort of catastrophic failue?