The owner's manual for the 2010 Subaru states "Tire chains cannot be used on any tires for your Legacy and Outback because of lack of clearance between the tires and vehicle body." How can this be for a vehicle advertised as being great for winter driving? Couldn't they have built the car (SUV) with an extra inch of clearance?
I know the argument that you rarely need chains on a Subaru. That's true, but there are conditions in which you do need chains, if you are going up or down a moderate incline with hard packed snow and ice.
The other idea is to put on winter tires every year. That may be ok if you live in snow country, but in California most people live in areas free of snow and do not want to put on winter tires for a few trips to snow country. It would be easier to carry chains and use them if necessary.