Report Tires in Cadillac Grooming: Details on Detailing, Looking Good and Showing Posted September 26, 2008 You could probably go with 235x50 or MAYBE 245x45 without any trouble, but be sure to check the clearance in your wheel wells with the steering wheel turned ALL THE WAY left and right. Check the clearance in the wheel well at the BACK, FRONT and TOP of the tire. You don't want to get new tires and then find out they rub on your fenders when you turn. I assume you know that when you use lower profile tires, they are going to ride MUCH harder. You will no longer have the smooth Cadillac ride you are now accustomed to. Thanks for the info, I don't think I'd go with the 50 series tires. Just something with alittle more meat. Like 235/60. I just bought the car and first things first. the owner couldn't find the wheel lock for those cadillac rims so I gotta get a key for that before any modifications can be made.