actaully i put them on 05 mustang v-6 wheels last night, there were a bitch to mount, as they are 50 series, i had isuues getting them to seat properly on the rims when being aired-up, it's almost they are too tight. i did a RFV on each tire, the highest was 17lb, which is cool, the highest weight used was a .75 oz weight.
there is some difference in hieght between the 215/65/16, the 50 seires dont seem to flex at all around corners, but the ride is definitly firmer. i'll see how they go with the speedo.
i had tried the 17's off an 06 mustang, but lost a lot of steering angle at low speeds like when parking, and in the rear, they would rub on the body when making hard corners, i think the tires would have been cool, just needed different offset wheels.
i just like to experiment with different things................