If I remember correctly, it comes from the Adaptive Undersampling of textures rendered past like a 256 or 512. Try turning that off and see if that fixes it.
thanks for embed. here's the textures (they are 4k for bike ,2k for packs,and 512 for the chain) i might re render the ao as i'm not too happy with it.
Could this be feasible? Or should I remove the parts underneath the clothes (please considere that the clothes may vary from 2k to 5k polys, with avg 512 to 1024 textures)?