lady lexus

Have just purchased a 2015 RX350. Because we wanted the Navigation system, we were told we had to get the 19 inch tires. Asked if we could get the 18 inches put on and told no....Since driving we have noticed a rougher ride. Went back to the dealer and asked if we could possibly do a switch to the 18 inch, since we are unhappy with the ride....Dealer has not been very co-operative... Anyone else notice the difference in the ride between the 19 and 18 inch....

Just purchased a 2015 RX350...The nav package came with 19 inch. Michelin tires. Asked if we could get 18 inch, but was told all nav packages have 19 inch tires. They seem to ride rougher than the 18 inch... Ask dealer to switch, but not very co-operative....Has anyone found any difference between the ride of a 19 inch compare to a 18 inch....