No experience with the Michelins - but I can comment on size as we are running 275/45/20 in General Grabber AT on several vehicles, as they are not available in 255, the 275/45 profile is the closest you will find to 255/50 profile - AND this is fact, this size & profile they are 100% fine absolutely no issues and the rolling radius is as near as dammit the same as 255/50. If anything the vehicle benefits from a slightly wider tyre as it helps get the power on the road.
The above goes for both autobahn speeds and copious off road use. 2021 L405 Vogue SE 4.4 V8 DIESEL ~ #17
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