We posted about a Knife Sharpening Bike that we discovered over at Bike Hacks a few months back. Recently, I discovered another cool knife sharpening bike video over at Bike Hugger. This video shows the Nella Knife Sharpening Bike in action. The bike was made by Winter Cycles for Nella Knifes. The inspiration for the bike came from grinders who used to use similar human-powered methods to sharpen knifes. Enjoy!