I wrote an email to Tesla, Goodyear and Dunlop on this matter, but after many weeks I still got no answer. Numbers: - acc. Edmund the actual curb weight of model S is 4.770 lbs at 47/53% weight distribution. this results in a load of 2.528 lbs on the rear tyres. - model S would take 5 adults, each 180 lbs, makes a total of 900 lbs. Looking at the position of people in the car I estimate 40/60% weight distribution. This makes 540 lbs on the rear tyres. - The trunk (directly above the rear tyres) I guess should be able to handle 250 lbs of luggage. Total static load on the rear tyres now is 2.528 + 540 + 250 = 3.318 lbs or 1.659 lbs per tyre. Now if my calculation is correct this means that the max. allowable load on the rear tyres is exceeded in this extreme case. Load index 96: max. 1.565 lbs. Load index 98: max 1.653 lbs. Furthermore it surprises me that similar ICE vehicles (i.e. Panamera) have lower curb weight but much higher load indexes for the rear tyres (101 - 107). Maybe because of their higher top speeds ? For my model S (hopefully to arrive in Oct) I will be considering tyres with a higher load index, just to be on the safe side. Any comments ?