A factory option for winters is 265/40r19 and 285/40r20. So running 285/35r20 and 305/35r20 is absolutely fine for the transfer case.
Next, the stock wheels are 9.5" and 10.5" wide. The R888R 285/35r20 can run on 9.5" to 11" and the 305/35r20 is rated for 10" to 12"
So there is absolutely no problems at all running those sizes.
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SCOTT26 "So as an admirer of the M5 and a potential customer of an M5 Touring. I would run naked around the streets of Garching if they were to offer one."
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