Did this not work?
https://n-gear.com/index.html

Does that still work? Given that the page was last updated in 2013, I just assumed it was no longer functional. Suppose I should have tried emailing them and seen.

A while back a friend broke his clavicle in a bike accident and had a titanium plate inserted to help the pieces knit together. Afterward he had the plate surgically removed. Here's his $80,000 chain catcher.

https://cimg5.ibsrv.net/gimg/bikefor...216ccf1c40.jpg

I emailed. Available.

Cool, I may have to get in touch for my next build.

My Domane SL5 came with one. Although it hasn’t been needed, yet, I’m glad it’s there to protect the carbon frame if something were to go wrong.

It also came with a small, clear plastic dork disc and I’m leaving that on, too. 😁

Same here DirePenguin, my only carbon a '98 Trek 5500 came with one (really just a huge washer under the BB bearing caps), glad it is there.

Had just seen this thread yesterday... While riding this morning, my chain fell off on bumpy section but was saved by the chain catcher that came with my new BMC road bike. Glad it was there... So, I guess my vote is YES.

i don't care TBH.

unless every bit of weight matters to the rider, a functional chain catcher is worth having to protect a CF frame imo. It also might save the top tube from meeting the whoo whoo area too!

waaayyy back in 2003 my bike shop installed a thin large diameter washer (larger diameter than the bb shell) between the crank side fixed cup and the frame. It was designed to catch the chain so it didn't cause damage to the cf. I thought it was an elegant solution, and barely noticeable.

I find it interesting that my SRAM Force FD that I used for my Cannondale build came with a chain catcher straight out of the box. The chain's never fallen off on the inside (maybe due to the catcher!), but it's fallen off once on the outside. The bike was only a couple hundred miles old, so a bit of cable stretch meant I had to push the paddle just a little harder to get the chain to hop up to - and then over - the big ring. A post ride cable adjustment and a quarter turn of the limit screw and she's behaved fine ever since.

Maybe I'm a good candidate for a crankset dork disk.

Trek supplied a similar washer to the owners of the early OCLV frames to prevent derailed chains from sawing through the frame

I have this washer on my bike

https://cimg3.ibsrv.net/gimg/bikefor...37b6a3bf7.jpeg
https://cimg6.ibsrv.net/gimg/bikefor...9693c2eaf.jpeg

have a chain catcher on this bike

I'd never heard of a chain catcher until I read this thread. Yet another thing to consider. I looked at my bikes and my Specialized came with a chain catcher but my Cervelo does not have one. I've never dropped the chain on my Cervelo but have had multiple chain drops on the Specialized. Maybe the chain catcher saved me from some grief, even though I didn't realize I had one. Should I add one to my Cervelo? Opinions in this thread seem to be mixed.