205/65R15 tires are 25.5 inches tall and 8 inches wide. They can be mounted to 15 x 8 wheels, but they might look kinda funny because the tread on them is probably only about 7 inches wide. That and there's no way you could air down and keep them on the rims, but with that size tire, why would you? Anyway, is it possible, yes. In a pinch, you could mount them and run them on the street, but it's not ideal.