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Message: <blockquote data-quote="mars2878" data-source="post: 28594" data-attributes="member: 12483">I have read that before. Unfortunately nothing useful.It's mostly trying to fit 17, 18 or aftermarket rims on a gmt800 with 4-piston calipers.The T1xx came from the factory with 4-piston brakes, optional 6-piston.I'm trying to find the determining factor why some can have the 6-piston & others can't?If I I'm using the T1xx rims, then I can use the 4-piston front brakes.But the 6-piston are not much more money.I can find random pictures online of a 2025 Yukon at4 Ultimate with Brembo 6-piston calipers with the R4L rims. But I can't find any for sale for which I could borrow the Vin #.I took the Vin of 2025 Yukon at4 Ultimate which has a 6.2L & went to the GM website. It says that the 6-piston is not compatible. I don't understand the reasoning?</blockquote>