I've notice alot of people mentioning that they get a separate set of wheels for their winter tires. I'm assuming this is for alot of folks who have the 21" all-season tires and are going to the smaller 19" tires because they handle better in the winter. I currently have the OEM 19" all season tires and am planning on buying same size winter tires. Are there any advantages to buying winter tires and having them mounted on their own separate rims? Is this the better way to go or are you mounting and balancing your all-season and winter tires onto the same rims all the time? Please share what you think are the advantages/disadvantages.