Purchased at MEC a few years ago for winter commuting. Not used very much to be honest as we never really got into winter riding. New these are $70/tire. Selling for $20/tire. Two tires available. Keep riding all year!! According to MEC: Get a grip on slick ice and frosty pavement. The strong, flexible Winter K-Guard HS tire has about half the spikes of most other winter tires, for control without excess drag. A winter essential. Kevlar Guard performance adds protection while lowering rolling resistance. Reflective lines for visibility on long winter nights. Spikes have a tungsten carbide core for durability.