As Roseannadanna would say, “Never mind”.

"Never mind" belongs to Emily Litella.

https://cimg2.ibsrv.net/gimg/bikefor...d3a5815965.jpg

My trousers have a hook and a button and a zipper. It seems redundant until one fails and the others keep my trousers up.

I know how to adjust a derailleur. Those who don't have people to do it for them. Derailleur hangers get bent, and when it happens, the owner is usually unaware. Some bike owners will swear that they never laid their bikes down on the right side and never got slammed in a self-closing door and never got collided into. Yet derailleur hangers do get bent somehow.

If I ever take another long bike tour, I will use a dork disk and one of those gawdawful derailleur guards. Because they work, and things that are important need redundancy.

I don't put leave my stovetop burner on AND I don't put flammable things on top, because if I forget one thing, I remember the other. Safety needs layers.

Ooh. Never mind.

Chain jamming between inner cog and spokes, and/or rear derailleur cage in the spokes, are both low occurrence but high severity events. And that bumps them to the top of the Failure Mode and Effects Analysis, prompting mitigation. Good derailleur adjustment can reduce occurrance, but not completely eliminate. True, I went 15 years with mega miles on my road racer without a disc (I can't recall if I removed for fashion or didn't come with one), but early in the life of my townie folder, chain fell into the spokes and it damage two spokes enough that both broke within a year. Bought a spoke protector disc for $5 at LBS and installed, and will install on every bike when they get out of storage.

This was about a year ago. We're all good now.


I might add a dork disk to my wheel though...

The average rider already has a bent hanger and an instinct to start messing with limit screws first, so I always leave them on. Liability-savers.

Not exactly the same issue but related:

This week we had a customer at the co-op complaining of not being able to shift. Looked at the derailleurs and the limit screws on both were screwed all the way in. A prior person who had access to the bike might have assumed they were loose and decided to "fix" the problem. After backing them out to the appropriate settings, the shifting improved greatly.

It’s terrible meeting your definition of average, but it was corrected with a new hanger. Average+?

(video) That is pretty great ground clearance for 11-38, although may be same for any short cage, which can probably handle 27 capacity. Seems to shift fine, despite much bigger distance between jockey pulley and the smaller cogs, as that RD does not move on a "slant", just laterally (I think like old-old Campagnolo). Because the cage pivot is between the pulleys instead of at/near jockey (top) pulley, as the jockey swings back, it also swings up. However that's opposite of what would be ideal; Big cogs pull on chain, jockey swings back and up, limiting low cog size. Small cogs slacken chain, jockey swings forward and down, increasing clearance with high cogs, reducing shift precision.

because for the average rider and bike they are useful...

And as the sands of time run through the hourglass, so has this thread.