how much power does the car put out? (you may end up with very little traction with 205's) and are you running same size tires all around? it also depends a lot on the speed you're going to carry b/c of the weight transfer. but i would have a backup set with me. you can bet on it handling kinda crappy with the sidewall flex. but ive been running 205/60s with 195/65s and not really had a problem.... just keep them inflated and try not to push it right away. should be fine