I agree, 275s for a 10" wide wheel. To answer your question, yes the rears are way stretched, as is the front with a 8.5" wheel width for the front...go with a 245/30/20 minimum.
Most manufacturers don't recommend a 255 and 10" wide wheel, most limit it to 9.5". You went with 20" wheels which makes it touch to find tires for the sizes you need.
Dave
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2020 Ford Mustang GT 6MT PP1 444rwhp
(Sold)2013 M3 Coupe-MR/BLK ZCP, 2011 M3 Coupe-MR/Blk
2007 Porsche 997C2S Speed Yellow/Blk sport seats
2004 BMW M3 Imola/Blk
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