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Do I Have the Right Rear Derailleur?

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Do I Have the Right Rear Derailleur?

Old 04-19-24, 02:37 PM
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Originally Posted by smd4
Does that second, incorrect protrusion/stop on the RD do anything except confuse people?
I didn't notice or have second thoughts when I had to replace my DA 9100 with an Ultegra R8000 after a minivan rear-ended me. It just fit and looked right. Different hanger? Now I need to dig up my R8000 to see if my version had it (replaced it with Sensah Empire Pro and set aside the bike for trainer duty).
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Old 04-19-24, 02:46 PM
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The OP was the one that f'ed up by installing it wrong.

Members here can't see the bike, all we can do is guess at best to bad photos.

If they don't like the suggestions that might fix their f-up, they can just bring their bike to a LBS, which is encouraged and not bad advice.

Do you know how many smart folks ask for advice on the internet on why their car won't start, when all they needed was to put GAS in it? It's not up to forum members to figure that out for them.
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Old 04-19-24, 02:47 PM
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👍 Should have checked first. My last cassette purchases were of the 5800 & 6800 vintage back in 2018.
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Old 04-19-24, 03:52 PM
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Originally Posted by Atlas Shrugged
The number of ridiculous responses from people who have no clue but weigh in regardless was amazing. Great you were able to fix it as well as filter out the garbage.
It's easy to criticize other people's suggestions from the safe position of having offered nothing at all.

I don't speak for others, but I'll consider the source before taking it to heart.
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Old 04-19-24, 04:26 PM
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I've learned to always read the setup instructions for any new groupset I encounter. Things have changed quite a bit since even 10 years ago when mounting F & R derailleurs was mostly the same procedure with only a couple little idiosyncrasies as compared to now with something like the OP's mounting issue. All mfrs publish instructions that can be easily found on the net if not included with the component. Even mounting the shifter cable on the wrong side of the clamp bolt is still a pretty common mistake so check out the instructions first.
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Old 04-19-24, 04:37 PM
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I've learned to always NOT to install a RD incorrectly, then blame everyone else for being clueless.
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Old 04-19-24, 04:51 PM
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Originally Posted by soyabean
The OP was the one that f'ed up by installing it wrong.

Members here can't see the bike, all we can do is guess at best to bad photos.

If they don't like the suggestions that might fix their f-up, they can just bring their bike to a LBS, which is encouraged and not bad advice.

Do you know how many smart folks ask for advice on the internet on why their car won't start, when all they needed was to put GAS in it? It's not up to forum members to figure that out for them.
The photos showed perfectly that the derailleur was not mounted correctly. The problem was all the respondents offering an opinion about a derailleur GENERATION that they apparently know nothing about.

Which is pretty damn typical.
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Old 04-19-24, 05:18 PM
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Thing looks like it has at least one too many pivots and a superfluous lug, so yeah, I wouldn’t know where to start!
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Old 04-19-24, 07:58 PM
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Originally Posted by soyabean
Do you know how many smart folks ask for advice on the internet on why their car won't start, when all they needed was to put GAS in it?
I'd guess it's proportionally about the same number, percentage-wise, as the number who claim that a too-large rear sprocket is the problem without bothering to check the RD's published specifications.

https://bike.shimano.com/en-EU/produ...-R8000-SS.html
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Old 04-19-24, 09:47 PM
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Originally Posted by soyabean
The 11-30 is messing it up with a chain too long because that is expecting a 1x up there.

You'd be able to remove one link with a smaller 11-28T, thus taughting the chain when it's on the 11T.

There exists aftermarket bolt-on dropouts that let's you place a RD even lower.
Where did you get this from?
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Old 04-20-24, 05:58 AM
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Originally Posted by soyabean
The 11-30 is messing it up with a chain too long because that is expecting a 1x up there.

You'd be able to remove one link with a smaller 11-28T, thus taughting the chain when it's on the 11T.

There exists aftermarket bolt-on dropouts that let's you place a RD even lower.
In addition to the first sentence being incorrect, a hanger extender (assuming that’s what is meant by “aftermarket bolt-on dropout) will not change the chain wrap capacity of the derailleur.
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Old 04-20-24, 04:00 PM
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Originally Posted by soyabean
I've learned to always NOT to install a RD incorrectly, then blame everyone else for being clueless.
who did i blame...?

I've rebuilt this bike 3 or 4 times with new components - this last time i screwed up something I didn't know it was possible to screw up.

as i said - i thought when i put t on that it looked odd, but I didn't see the mistake.

so the lesson is that if you think something looks weird and can't figure out why.., keep looking.
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Old 04-20-24, 04:06 PM
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Glad it got worked out. The only thing I would have contributed was that I've ran 32t cassettes with short cage derailleurs so that couldn't have been the problem.
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Old 04-22-24, 01:14 AM
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Originally Posted by jgf310
who did i blame...?
I can't figure that out either! You were nothing short of respectful to all of us, right or wrong.

And good eye from KCT1986 !
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Old 04-22-24, 06:08 AM
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Everyone who has installed their own parts has had issues of some kind or other. I’ve done a number of boneheaded things in my time, and, according to my wife, will probably do many more.
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Old 04-22-24, 06:28 AM
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Originally Posted by jgf310
who did i blame...?

I've rebuilt this bike 3 or 4 times with new components - this last time i screwed up something I didn't know it was possible to screw up.

as i said - i thought when i put t on that it looked odd, but I didn't see the mistake.

so the lesson is that if you think something looks weird and can't figure out why.., keep looking.
You weren't accused of blaming anyone - the remark you responded to was part of the bickering side-conversation.
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Old 04-22-24, 06:47 AM
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Originally Posted by soyabean
11-30T is practically a mtb cassette.
It's a normal road cassette, the same as Ultegra 11-32, and on 12s 11-34 ....
105/Ultegra rear mech with medium cage works well with 11-32 cassette as well, just avoid maximum cross chain (Di2 will block it for you - small/small - so no full slack situation and risk of dropped chain, however big/big is allowed (as an emergency I guess, or if you miss gears) )

(MTBs cassettes are from 42 up now )

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Old 04-22-24, 12:19 PM
  #43  
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Originally Posted by Trakhak
You weren't accused of blaming anyone - the remark you responded to was part of the bickering side-conversation.
The wording made it seem like it was against the OP.

Originally Posted by soyabean
The OP was the one that f'ed up by installing it wrong... If they don't like the suggestions that might fix their f-up, they can just bring their bike to a LBS, which is encouraged and not bad advice.

Do you know how many smart folks ask for advice on the internet on why their car won't start, when all they needed was to put GAS in it? It's not up to forum members to figure that out for them.
Originally Posted by soyabean
I've learned to always NOT to install a RD incorrectly, then blame everyone else for being clueless.
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Old 04-22-24, 12:38 PM
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Originally Posted by jgf310
the cage is still pretty horizontal in big/big, which causes resistance
I've gotten that derailleur to tolerate an 11-36T cassette, with the B-screw screwed in almost all the way.

The Big-Big chainring combination is best avoided. Ideally, you want to be able to shift into it so that if you do it by accident, it won't rip your drivetrain apart.

My wife seems to have a perverse need to ride in that combo. But normal people don't need to, since the gear ratio can be replicated elsewhere.

Hers is a Di2 system. Interestingly, it doesn't prevent the big/big combo by default, but it does prevent the user from shifting into the small/small combo, presumably to avoid slack.

Here is the best way to size the chain: https://bettershifting.com/installat...and-direction/
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