Today I learned
 

Even if you install the chain as pictured in this video, your bike will still be perfectly rideable. BUT you will wonder "why is my new chain and cassette so damn noisy? Why is the shifting so finicky?", and you will take a video to post to BF and ask the mechanic forum "why is my new drivetrain so noisy and the shifting so finicky?", then you will look at the video again and go "ooooooooooooh. dammit.":notamused:

https://youtu.be/UneF1LhPRtA

:lol:

As a bike noobie, I'm not sure what I'm looking at?

There are little tabs on the jockey wheel cage plates by the pulleys. The chain is supposed to route *under* those tabs. If you go over them instead, it's really noisy.

I had an S&S coupled travel bike for a while and always removed the chain when packing it for a trip. One time when I assembled it in a hotel room I did exactly what you show and mis-routed it through the rear derailleur. In the first 100 meters I knew something was wrong and had to stop to fix it in the hotel parking lot.

I know a guy that happened to.............

Me too !!

Been there done that, didn't get a tee-shirt. :innocent:

Lack of (my) experience definitely played a part. For awhile I was just thinking "maybe the old chain was that noisy and I'm being paranoid because I actually did the work." It was only flipping the bike upside down to take the video for this forum that made it obvious.

He also has the cable wrapped around the anchor bolt, which you're not supposed to do.

Congratulations, you're the 87,893rd person to do this. And that's only so far this year. Buy yourself a beer and look forward to making new and creative mistakes in the future.

:lol: I did it last May. Right before a century and in certain gear combinations it was nooooooooisy. Because I'm obsessive about bike noise, I had to change gears going up a hill when ever I got near anybody. A kind mechanic at a rest stop fixed it for me. Hooray for quick disconnects on chains.

+100 Master links have made this kind of mistake a nuisance, not a major problem.

My wife's bike has had a noisy drivetrain since day one. After a clean and lube of the chain trying to quiet it down, it was really noisy and shifted like crap.
I'll give you two guesses what I did, and the first doesn't count.

there is a scar on the f'n little tab to remind me every time I look at it.

I'm glad to see I'm not alone. And my commute was so much quieter this morning.

I think this just might be the answer to a question I've been asking myself...:rolleyes:

Yea me too. He's looking at me in the mirror right now!

I think 95% of all mechanics have done this, and the other 5% are liars.

It can also be fixed by removing the lower jockey wheel, hardly a major problem... :beer:

+ 1 more. Didn't even have to look at the video, I just knew.

On my Force wiFLi, it isn't all that obvious it's misrouted. Shifted fine.

scott s.
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A scar on the tab!?!? Are you kidding me. The one time I did that I actually took that tab off. There I am, riding along going "Darn is that thing noisy in this gear." Then there was a "Ping" and it got all quiet and smooth.

It's not every day that a bike fixes itself...

Did that too. Drove me nuts for a good half hour trying to figure out what was messed up

That der continued to serve me well for a very long time after that. Apparently that tab doesn't do much. Except make you thread the chain around it.