I've got excessive tyre wear on the outer edge of my mk2 Clio 172 front drivers side tyre. I have a thudding noise when going over bumps coming from the same side. What could this be? - shocks? - dampners? - springs? - low tyre pressure (adding to wear). The tracking seems OK, although the car does tramline to whatever camber the road is but I thought that was usual for a 172?