Sorry for posting this here I just need it up so I could ask a question. This is the only place I know where to attach an image.

With that said... what is it called? That piece that covers the gear like that. Does it just screw on there or would I have to buy a separate crank arm and everything for that? I think it would come in handy for those close calls when you don't quite make it up that rock or tree as smoothly as possible... you know that ::Scraaaap:: sound!

-Joe