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Message: <blockquote data-quote="Marky Dissod" data-source="post: 28587" data-attributes="member: 13218">You likely do not need the Brembo 6piston caliper, though I get why anyone would want them.Since I think EVERYONE should own the 4 piston calipers, let me focus on that here.4piston calipers require a wheel of a certain shape. Think I found a (the?) GM OE 17" wheel that works with the 4piston caliper:[URL unfurl="true"]https://www.hubcaphaven.com/p/28907/stlgn096u45-chevrolet-colorado-silverado-gmc-sierra-1500-yukon-wheel-rim-steel-black-84440192.html[/URL]There are quite a few 18" wheels that don't work with 4piston calipers, without clearancing the caliper.If you look carefully at the GM OE '84440192' wheels, you'll understand why some 18" wheels also don't work without clearancing the caliper (by which I mean):[URL unfurl="true"]https://www.performancetrucks.net/forums/gmt-k2xx-trucks-general-discussion-221/4-piston-calipers-fitment-wheels-list-558552/page9/#post5533695[/URL][URL unfurl="true"]https://www.performancetrucks.net/forums/gmt-k2xx-trucks-general-discussion-221/4-piston-calipers-fitment-wheels-list-558552/page3/#post5513244[/URL]If you're unwilling to alter the part of the calipers that might interfere with the wheel, then you are limited to a specific wheel shape.If you prefer oversimplification, wheels older than 2019 are likely to interfere with the 4 piston calipers.</blockquote>