Chain catcher

Dog-fang style chain catcher that prevents derailment inboard relative to the bike. 28.6 mm seat tube only. Comes in two halves that are joined using a zip tie about 0.20" in width.

I tried this once on my bike with a triple crankset, & the fang was way too short outboard. I'm too lazy to update this since I was able to fix the FD to prevent the chain from dropping inboard.

I also uploaded my reference image.