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20X9 Vs 20X10 Offset Question

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I have a 2020 Sierra SLT 4WD with a 2" leveling kit. It has the stock 20" snowflake wheels with 33x12.50 Open Country RT tires with no rubbing. I am looking at 20X9 wheels with 0 offset or 20X10 wheels with -18 offset. The tires are in great shape so I am not changing them yet. I want the tires to stick out from the fender wells just a bit. Maybe an inch or so. I cannot get my head wrapped around the offset with the different width wheels. I believe the factory 20s  are a +27. Any input or advice would be much appreciated. Thanks in advance!

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