Yes, it is a base sedan (4dr).. sorry I forgot to mention that... and thank you for the info and your reply...You failed to mention which body style or model of the G6 so I will assume it is a base sedan. That vehicle had a tire option of 225/50-17. That tire was 25.86" in diameter. The 235/50-17 is 26.25" in diameter. So a little more than a 1/4" difference so no significant effect on the speedometer or computer and only .4" wider. I see no reason why that tire couldnt be used.