I owned a GMC Dealership for a few years and I never heard of anybody trying to deny a warranty claim due to aftermarket wheels and tires. It's really up to your dealer. They have to bring it up to the warranty adjuster and trust me, dealerships love warranty work. Every lug in the MT is siped by the way.
__________________
2006 H3 Lux/Offroad - Slate Blue - Ebony Leather - Sunroof - Brush Guard - Husky Rear Mat - Petz Cover (so my Wheaton Terrier can ride with me) - GOBI Stealth Rack - PIAA Lights - DC/AC Coverter - Truxxx Leveling Kit - DC1 Wheels - 35"X12.50" Toyo Open Country AT - Step Bars - Onboard Air - Chrome Fire Extinguisher
2003 Mercedes Benz S500 AMG
2003 BMW Z3 - Wife's