The 22 inch rims on my vehicle are cast aluminum I'm assuming. I have had several cracks causing me to rapidly loose air on the tires while driving at highway speeds. I have had three cracks in different rims within the last week and have had the rims repaired twice. The vehicle has 75k miles on it. This is a major concern and safety issue. I've never seen that many cracks happen at once. Some say well your hitting potholes but that isn't the case here.

- Princeville, NC, USA

Rims keep cracking on the inside where the tire is sealed. This has happen a total of three times to both front and rear passenger side. Tire pressures are 36psi as recommended by manufacturer. No major pot holes or other road hazards have been hit.

- Lillington, NC, USA

With cruise control activated, at least 10 times since I bought this expensive vehicle the automated emergency braking activated at highway speeds - causing the vehicle to full brake without warning and nearly causing an accident each time (handling risk and risk of being impacted from behind by a following vehicle). I have formally reported this issue to dealers in MN and MT, and they only thing they said was they could not duplicate the condition during brief test rides and this was not a know problem. I personally know this was a known problem and GM did a safety recall for this condition on MY15-20 Suburbans. This condition is definitely an unreasonable risk to motor vehicle safety. In additional, the original tires supplied by GM (Firestone) failed under normal driving conditions after only about 35,000 miles, and both GM and Firestone denied there was any warranty coverage. Since then, new Les Schwab tires failed at about the same mileage. Something is obviously not right with this vehicle, and this condition is also an unreasonable risk to motor vehicle safety. Finally, last week my front passenger wheel cracked. I have not hit anything significantly hard with that wheel - but it is nonetheless cracked. This is also obviously defective and an unreasonable risk to motor vehicle safety.

- Rexford, MT, USA