Shell 40-42T Bicycle Chain Guard do Cycling with Tail Attached Description: [Material]: The bicycle chain guard is made of material, it is lightweight and provides a long time of use. [Bicycle Chain Protector]: The bicycle chain guard is designed to protect the bicycle chain from dust, water, stones, etc. [Installation instructions]: 1. Remove the middle roller. 2. Place it in a fixed bracket 3. Reinstall the center roller 4. Make sure the bracket is installed correctly and do not install it do upside down. 5. Reinstall the shield. 6. Put the chain back on. 7. Put the chain guard on. 8. Attach the chain guard za screws. 9 . Attach the tail of the chain guard. (please pre-place the hole. ) [Minimalistic design]: The bicycle chain guard ma 330-430 mm and is designed in a simple and modern way. [Suitable for]: The bicycle chain guard is suitable for 40-42T. Please confirm the size and crank set, aby make sure it is suitable. Specification: Fits do: 40-42T Size Chart: 330-430mm The package includes: 1 set bicycle chain guard