A bike tech told me it is hard to find chain guards for all bicycles, if not impossible. He suggested if it is shorts weather, then wear shorts or roll your pants up or use a clip or strap. The reason he gave was many chain guards break and bike manufacturers don't always carry replacements. Also, to design a chain guard to fit all bicycles is impossible due to the varying types of bikes our there with multiple gears etc. That's why my next commuter bike will come with fenders and a chain guard and be designed to accommodate both.