One needs to be careful as regards winter tyres/wheels and your insurance. If one fits a different size wheel, the insurer may view it as a change to the car's spec and may either charge for a modification or refuse cover for the change (as the member's insurer did from the post below [November 2013]) - "I would like to point out to members again, that Toyota Insurance do not accept a change of wheel size from original specification. I have a 2012 Auris HSD T-Spirit with 17" wheels, and enquired about fitting 15" wheels and appropriate tyres for the winter. Toyota Insurance will not provide cover for this change. I have concluded that if I want 15" wheels I will have to seek out an insurer that will provide cover for alternative wheels, or change my car for an Auris HSD T4 supplied new with 15" wheels. I think the 1st option will prove the most cost effective. A disappointment, but from the number of cars fitted with different wheels, I am sure that some insurers will accommodate this change (with an amendment charge of course)."