Can you put a chain guard on a 21 speed bike?

Yes, you can put a chain guard on a 21-speed bike, provided that the frame and components allow for it. Chain guards are designed to help protect the chain and keep clothing clean, and they can be installed on most bikes with the right fittings. When choosing a chain guard, ensure it is compatible with your bike's gearing and frame design. Installation may require some adjustments, so it's a good idea to consult a bike mechanic if you're unsure.