You may have seen our story on the Timbersled, a conversion system to turn your dirt bike into a snowmobile. Now we have another great conversion for you; turn your mountain bike into a human-powered snowmobile. If you have been itching to get out and ride your mountain bike this winter, it may be worth giving this conversion a try. The kit is from a company called KtraK. It is designed as an add on to your current two-wheeler, and will enable you to pedal your way through snow with its front ski attachment and rear snow track. The assembly is easy using your bike’s quick releases, according to the company website. It operates on mountain bikes with both hardtail and suspensions setups. KtraK.es