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Sorry for the long post. This has been a headache to try and find “factual” information on instead of “opinions”. I have a 2019 Silverado work truck V-6 , 6 speed, with 3:42 gearing. I have a stock suspension. The 2019 work truck comes with three tire options From factory. 1. 17" 255/70R17 all-season, blackwall tires (my current tire) 2. 17" 265/65R17 all-terrain, blackwall tires 3. 17" LT265/70R17C all-terrain, blackwall tires However, ... the Silverado Custom (with the same 3:42 gearing) comes with the following tire opens. 1.20” 275/60R20 all-season, blackwall tires 2. 20”275/60R20SL all-terrain, blackwall tires 3. 22” 275/50R22SL all-season, blackwall tires My current truck has the 17” 255/70R17 all seasons. I love my truck, but I absolutely hate these tires/wheels. They look like baby wheels on a big truck. Way too much fender well free space. Looks like the truck missed “leg day“. My question is if I purchase the OEM wheels and tires for the custom, is there any issue with them fitting my work truck? As far as I know both trucks have the exact same suspension, body clearance, control arms, wheel well clearance, etc. I was looking at going with the 20”275/60R20SL all-terrain, blackwall tires. The only changes that I could forsee that would happen are the following... 1. An increase in wheel diameter of current 31.1” increasing to 33”. 2.a width increase from 10” to 10.8” 3. A sidewall decrease from 7” to 6.5” 4. A revs/mile decrease from 650 to 612 (affecting speedometer speed by .058%) 5. A new effective gear ratio of 3.22:1 6. A change in tire run pressure from 35psi to 32psi. (Annoyingly setting of my TPMS “low pressure” alarm ) several questions.... 1.will these custom tires fit my work truck? I can’t Find any reason that they won’t 2. Will the dealer reprogram my speedometer for the percentage difference, and replacard/reprogram my ECM with the new psi setting to 32psi. (Not sure if they will since the Vin number of my truck does not include these tire size as “options“.) I really don’t want my low pressure alarm going off 24/7. 3. Will I noticed the change in new affective gear ratio from 3.42, to 3.22? (I’m assuming I won’t since it is the exact same gearing/tire size as the custom. Man, there sure is a lot to changing a tire size. Almost doesn’t even seem worth the trouble. Am I going down a bad rabbit hole? Just an FYI, I am not interested in lift kits, aftermarket speedometer programmers, etc. . Would like to stick OEM as much as possible.