in insurance everything is covered bumper to bumper. there are some technicalities which needs to be understood by prospective clients - car is covered with factory fitted accessories ONLY (extra accessories other than ff are covered to a very minor extent only e.g. upto say 30k value) - its not like that you buy an xli and install Grande rims in it and expect full coverage of them, OR you install expensive Grande projector head lamps in your xli and expect insurance company to compensate you with that in case of loss. so, regarding your query, if anything happens to your car, it is covered, however the depreciation impact will be borne by you. tyres+batteries have 50% excess depreciation rate than all other car parts as they are very short life and quick depleting items.