I'm thinking of using an extra set of 21" turbine wheels I have on a model X 90D I just ordered with the stock rims. Will save me $5500, and all I'd need to do is buy 4 tires. I talked with a wheel shop, and they discouraged me from doing it - said the offsets are different, and it could cause damage. But they also want to sell me wheels, so I wanted to see if anyone else here has an opinion/expertise in this area. There are a bunch of threads on 20" v 22" wheels already - and a few mentions of using 21s... but nothing with the kind of depth or certainty I'm hoping to get. Can't wait to get the car - but really dislike the looks of the 20" stock wheels. Also considering the T Sportline 20" TST wheels, but thinking if my 21" wheels will work, I'd go that route first and see how it goes. Seems like a good compromise if it won't damage the X. Thoughts?