HI I have a problem with the bearings in my rear wheel Its a standard wheel from a Onza T-comp, and the bearings keep coming loose everytime i ride i do make sure they are tightened before i go out. i had a look at them and there seems to be a bearings cap which is broken and im wondering if this is the problem or it might be somthing else can any of you give me some information on the problem? thanks, Ben