For anyone out there with an impala who has a winter climate as bad as ours in Newfoundland and you would like to go to a smaller tire for better braking and traction then your 16 inch rims and tires here is what I did,the 15 inch rims will fit the rear of the impalas but will not fit over the caliper in the front,you have to find a set of caliper brackets off of a 1998 & up montana or venture van and buy a set of new rotors to fit the same van to use for your impala,just take the original caliper brackets off put on the montana or venture van caliper brackets on with the new rotors that fit the montana or venture van & you don't change the caliper you use the same caliper,now you can get 15 inch rims to fit you car,you can also put the 16 inch back on using the same set up with out putting the original brackets and rotors on, I opted to keep the montana rotors and brackets on my impala since the summer and brakes work fine.Rotors are about $10-$20 cheaper for the vans then they are for the original impala rotors,same goes for tires from a 16 inch tire to a 15 inch you can save up to $50 a tire depending on the brand you buy.to get the same ride height and keep the speedometer reading right the tire size you will need for the 15 inch tires are 215/65/15