I know that K-Edge has a nice looking and very pricey (lowest easily found price is $44) cross-specific chain catcher. But is there any reason why the dog fang would not do the job for under $15? I can’t see why.
Also, why I’ve not really dropped my chain in the front ring, I’ve been quite good at dropping it in the back, against the spokes, and it’s a huge PITA to undo. Besides not shifting front and back simultaneously at the bottom of a climb (which probably resulted in way more slack that my derailleur can pick up while I keep pedaling), I don’t think there’s much I can do there, right?
The dog fang works great if you have a round seat tube. If you don’t… that is why K edge exists.
And adjust your limit screws (in this case the Low limit screw) on your rear mech. It should not do that, and can wreck a wheel quick.
Cross bike: 31.8 mm round tube, no braze on derailleur. Hence I do need a clamp-on.
Would a regular clamp-on K-edge work too? I’m afraid it might go down too low? Though I guess the same would apply on a road bike if clamped under the derailleur clamp, so maybe not an issue at all?
Screw the whole chain watcher mechanism. Go single ring with dual chain guides. Hard to drop a chain that way!!! It’s work out pretty well for me.
I’ve used both the dog fang on a round seat tube road bike and the K edge braze-on catcher on a square seat tube bike. In the end, both work the same and are really just insurance. I very, very rarely dropped a chain in the front (properly adjusted front derailleur). But with a carbon frame, they are nice insurance it something were to happen. I like the dog fang because you don’t have to mess with the front mech. The K Edge you pointed to shares this benefit, but it seems like an over kill to me when a dong fang works just as well.