My rear wheel is giving me fits. Sometimes it'll stay true for weeks, and then it starts getting the wobbly. After truing, it may stay true for quite a while or it may go out in just a few miles. I was truing it myself, so I decided to give the pros a try. I took it to my LBS Monday and a guy that's worked there 19 years trued it for me.
Within 10 miles it was out again. Several of the spokes were noticeable loose. I tightened them up and retrued the wheel and it stayed for the rest of my 30 mile ride.
But this is getting annoying. Is it the wheel? (It's a Matrix BTW, and it's only the rear wheel, the front is fine) Is it worn out and simply time for a new one? Why would the spokes loosen up after 10 miles? Could the spokes be worn out? I just bought the bike a couple months ago from a guy that never rode it. It's a 1998 Trek 2120, so it's been sitting quite a while.