700c wheels i presume. i rode the same set of wheels year round last year in connecticut and ran cyclocross tires when it was crappy out. got a new wheelset over the summer though and this year i will have a set of studded snow tires on one set of wheels and then just regulars on the other set of wheels. icebike.com liked the nashbar studded tires (http://icebike.com/Equipment/nashbar700c.htm) and i got a set on sale for real cheap this summer, looks like they are out now, but i am sure they will have more. they were easy to install and felt good on a test ride, give that a try.