Is it OK? Yes, but! The winter tires are very soft and will wear out extremely fast if regularly driven on pavement. They are soft to provide better grip on snow and ice. Summer tires are generally harder and have a tread design that generally will not handle snow well, if at all. A lot also depends on where you live and whether your car handles snow and ice well, naturally. In my opinion, you have two options. 1) Have two sets of tires and /or wheels. One, a summer set (summer tires, possibly with the nice alloy wheels that came on your car) and two, a winter set (winter tires, with a less expensive set of steel wheels). Exchange them when the first snows typically arrive and again when snow is no longer likely. Here in Wisconsin, that would be 11/15 (put winter on) and 3/15 (put summer on). This is the more expensive option (initially), but you save on wear on both sets of tires and in the winter may save because of accidents that you may avoid. Also, some cars are naturally horrible in the snow/ice and this may be the only safe route. 2) Get a set of GOOD all-season tires.