Do I Have the Right Rear Derailleur?
04-19-24, 02:37 PM
#26
Full Member
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).
04-19-24, 02:46 PM
#27
Senior Member
Join Date: Feb 2022
Location: GMT-5
Posts: 967
Mentioned: 1 Post(s)
Tagged: 0 Thread(s)
Quoted: 564 Post(s)
Liked 422 Times
in
279 Posts
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.
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.
04-19-24, 03:52 PM
#29
Senior Member
Join Date: Apr 2009
Location: New Rochelle, NY
Posts: 38,892
Bikes: too many bikes from 1967 10s (5x2)Frejus to a Sumitomo Ti/Chorus aluminum 10s (10x2), plus one non-susp mtn bike I use as my commuter
Mentioned: 140 Post(s)
Tagged: 1 Thread(s)
Quoted: 5886 Post(s)
Liked 2,728 Times
in
1,522 Posts
I don't speak for others, but I'll consider the source before taking it to heart.
__________________
FB
Chain-L site
An ounce of diagnosis is worth a pound of cure.
Just because I'm tired of arguing, doesn't mean you're right.
“One accurate measurement is worth a thousand expert opinions” - Adm Grace Murray Hopper - USN
WARNING, I'm from New York. Thin skinned people should maintain safe distance.
FB
Chain-L site
An ounce of diagnosis is worth a pound of cure.
Just because I'm tired of arguing, doesn't mean you're right.
“One accurate measurement is worth a thousand expert opinions” - Adm Grace Murray Hopper - USN
WARNING, I'm from New York. Thin skinned people should maintain safe distance.
Likes For FBinNY:
04-19-24, 04:26 PM
#30
Senior Member
Join Date: Jan 2009
Location: San Diego, CA
Posts: 3,709
Mentioned: 10 Post(s)
Tagged: 0 Thread(s)
Quoted: 855 Post(s)
Liked 1,088 Times
in
758 Posts
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.
04-19-24, 04:51 PM
#32
Senior Member
Join Date: Apr 2011
Posts: 7,272
Mentioned: 43 Post(s)
Tagged: 0 Thread(s)
Quoted: 4539 Post(s)
Liked 1,676 Times
in
1,098 Posts
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.
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.
Which is pretty damn typical.
Likes For Kontact:
04-19-24, 05:18 PM
#33
Senior Member
Join Date: Dec 2020
Location: Wake Forest, NC
Posts: 5,898
Bikes: 1989 Cinelli Supercorsa
Mentioned: 11 Post(s)
Tagged: 0 Thread(s)
Quoted: 3576 Post(s)
Liked 2,997 Times
in
1,813 Posts
Thing looks like it has at least one too many pivots and a superfluous lug, so yeah, I wouldn’t know where to start!
04-19-24, 07:58 PM
#34
Senior Member
https://bike.shimano.com/en-EU/produ...-R8000-SS.html
Likes For Hondo6:
04-19-24, 09:47 PM
#35
Senior Member
Join Date: Apr 2011
Posts: 7,272
Mentioned: 43 Post(s)
Tagged: 0 Thread(s)
Quoted: 4539 Post(s)
Liked 1,676 Times
in
1,098 Posts
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.
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.
04-20-24, 05:58 AM
#36
Senior Member
Join Date: Dec 2008
Location: Pioneer Valley
Posts: 1,166
Mentioned: 2 Post(s)
Tagged: 0 Thread(s)
Quoted: 387 Post(s)
Liked 873 Times
in
449 Posts
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.
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.
Likes For bboy314:
04-20-24, 04:00 PM
#37
Full Member
Thread Starter
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.
Likes For jgf310:
04-20-24, 04:06 PM
#38
Senior Member
Join Date: Jun 2002
Location: San Jose, CA
Posts: 3,715
Bikes: Too many bikes, too little time to ride
Mentioned: 2 Post(s)
Tagged: 0 Thread(s)
Quoted: 443 Post(s)
Liked 474 Times
in
328 Posts
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.
Likes For tFUnK:
04-22-24, 01:14 AM
#39
Over the hill
Join Date: Mar 2006
Location: Los Angeles, CA
Posts: 24,399
Bikes: Giant Defy, Giant Revolt
Mentioned: 1 Post(s)
Tagged: 0 Thread(s)
Quoted: 1006 Post(s)
Liked 1,226 Times
in
702 Posts
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 !
And good eye from KCT1986 !
__________________
It's like riding a bicycle
It's like riding a bicycle
04-22-24, 06:08 AM
#40
Senior Member
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.
04-22-24, 06:28 AM
#41
Senior Member
Join Date: Jan 2005
Location: Baltimore, MD
Posts: 5,488
Mentioned: 15 Post(s)
Tagged: 0 Thread(s)
Quoted: 2544 Post(s)
Liked 3,025 Times
in
1,723 Posts
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.
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.
04-22-24, 06:47 AM
#42
Junior Member
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
)
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
)
Last edited by razorjack; 04-24-24 at 05:24 AM.
04-22-24, 12:19 PM
#43
Over the hill
Join Date: Mar 2006
Location: Los Angeles, CA
Posts: 24,399
Bikes: Giant Defy, Giant Revolt
Mentioned: 1 Post(s)
Tagged: 0 Thread(s)
Quoted: 1006 Post(s)
Liked 1,226 Times
in
702 Posts
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.
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.
__________________
It's like riding a bicycle
It's like riding a bicycle
04-22-24, 12:38 PM
#44
ignominious poltroon
Join Date: Jan 2022
Posts: 4,120
Mentioned: 3 Post(s)
Tagged: 0 Thread(s)
Quoted: 2275 Post(s)
Liked 3,499 Times
in
1,835 Posts
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/
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/
