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Model X and 21" Arachnid Wheels

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I'm also interested to find this out. Read in another thread that it was something to do with the load of the X vs the S, however, forged wheels should actually be stronger than the the stock 22s so other than offset, unclear why it couldn't work.
 
comparing the 2 wheels side by side we have

20x9 +35
20x10 +40

vs

21x8.5 +40
21x9 +40

front wheel would have 1mm more inner clearance
outer would sit in 11mm more

rear wheels would have 13mm more inner clearance
outer would sit in 13mm more

simply put, they should fit but will be more sunken into the wheel well by ~1/2 inch
 
comparing the 2 wheels side by side we have

20x9 +35
20x10 +40

vs

21x8.5 +40
21x9 +40

front wheel would have 1mm more inner clearance
outer would sit in 11mm more

rear wheels would have 13mm more inner clearance
outer would sit in 13mm more

simply put, they should fit but will be more sunken into the wheel well by ~1/2 inch

Any reason why you couldn't just add spacers?