Hi, I have just purchased a Goldwing that had stood unused for a couple of years and I dont think it was on its centre stand. The Metzeler M880 Marathon had only 12 psi in it when I picked it up and since re-inflating it to 40psi I have a noticed slow speed (30-40mph) wheel wobble and some road noise when pressure drops to around 36psi. Does this indicate a flat spot in the M880 and should I ditch it for a new one? If I re-inflate back up to 40+psi the road noise and wobble decreases and only reappears as the tyre loses pressure. I have just put a brand new M888 front tyre and its made no difference to the wheel wobble.