I am currently in the process of giving my old bike a service. When trying to fix the rear brakes I notice the rear wheel slowly tilts from left to right. Not by a lot but enough to effect the breaks. I'm not a bike expert at all but I assume this means the wheel is out of true? As it doesn't wobble when stationary, I don't think anything is loose. Is that it for my wheel? As it's not your standard wire spoke. Please see attached photo of wheel.