HI. I have been considering replacing the tyres on my Model X 75D. There are a few options: 1. slap on the 21s from my Model S. I would like to get all 4s on 265/40 R21 tyres (i.e. non-staggered). Anyone did that? 2. replace the tyres on the current rims (which I think are staggered rims. Car came with 255 on the front, 275 on the rear, was thinking maybe making them all 255 or 265, and then maybe rotating the rims. Has anyone put the wider rims from the back to the front, in this config? Any issues? 3. Get a new set of rims (20s), 9 inch wide, and using 265 on all 4s. Has anyone did this? For those wondering "but why", my reasons are as follows: 1. I would like to be able to fully rotate the tyres 2. If I can get 265/45R20 tyres at a cheaper price, I would like to go with that rather than have them staggered. 3. I do not believe having an extra 10 or 20mm width on the back of a 75D is going to make a huge difference. I have the P85D Model S, and the 245s on the back aren't a problem. Any thoughts are welcomed. Thanks guys.