Cool idea! Looks like they may be available within a year or two. I wonder how much four of them would really cost....Q Tires feature retractable studs that emerge when the driver flicks a switch inside the car. When the snow and ice melt, all it takes is another flip of the switch _ and voila _ the studs hide back under the treads and the tires are transformed again.
http://www.msnbc.msn.com/id/23869393/
- Ceicei