my car rear tire both side uneven worn out inside edge,what cause this problem?misalignment?or bad tyre?car suspension problem?
i am using neuton nt8000,only 1 1/2 year i use,tread still got many..i always regularly check tire pressure also,last alignment is about 4 month ago

just yesterday i seeking my puppy under my car then i saw my tire worn out badly inner edge


now what to do?go change new tyre and alignment back?if suspension problem after 3-4month worn again i koyak la
or go check at service center 1st?