Don't worry about riding on the snow this winter. The Ktrak allows you to transform your mountain bike into a bike that you can ride on the snow. According to techeblog, " Ktrak is a device that transforms your two-wheeled dream into a rear-track machine with a single ski up front for steering. The track and the ski are made of reinforced polyurethane and the idler and main wheels are made of reinforced nylon. The track's 2â€³ width provides plenty of surface area for gripping the snow and after installation, the kit will only add 5 to 7 pounds to your bike"