My daughter just purchased a 2015 Forte5 SX with the 1.6 turbo engine. She will need snow tires shortly. The tire size is 225/40R18. My son also has a 2015 base model Forte5. His winter tires are 205/55R16. I don't know the exact size of his summer tires besides that they are 16 inch. Would the brake calipers be any bigger on the SX vs the base model and can I put the 205/55R16 winter tires on my daughters SX? I have to admit that I know little about tires with offset and such. I do know that the tire height is almost but not quite the same so there will be difference of less than 1 km/hr if I do put this size tire on. When I talked to the dealer they said they are not sure if the tires would fit until they put them on! Hard to believe. The reason she wants the 16 inch verses an 18 inch rim/tire is the cost. Any help would be appreciated.