I have just switched my 2008 Volvo XC70 wheels and tyres from standard 235/55 R17 to winter 215/65 R16. The difference and improvement is amazing. The ride is vastly improved, road noise reduced, steering is lighter, fuel economy improved and tyres are £50 a corner cheaper. I now need to sell the 17-inch rims as I have no intention of putting them back on the vehicle. Churchill the insurer has been informed and made no charge.