Leisesturm

Hi. Have a new bike that is minimally assembled from the factory. Supplied rear derailleur is a long cage Shimano Deore. The frame has a replaceable hanger. Derailleur appears to have a removable hanger of its own. When I remove that and mount the main body of the derailleur to the hanger the B screw does not make proper contact, the micro adjust hits the hanger at the back, and the holes to thread the mounting bolt through don't quite line up. With both the frame hanger and derailleur hanger installed everything fits but it just doesn't look quite right. I've checked with other bikes I have and all of them have the derailleur body bolt right up to the hanger. Thoughts? I'll focus on other aspects of the assembly in the meanwhile... its going to be a long day.

dsbrantjr

A couple of clear, well-focused photos will help immensely, to understand your problem.

Leisesturm

Here is one.

JohnDThompson 

How about a picture showing the inner face of the dropout, so we can see where the B-screw lands? Take the wheel out for a clearer view.

Leisesturm

In the picture above the B screw is fine. It is integral with the lower of the two silver pivots seen. The upper silver screw is fixed, it does not pivot. The short hanger that connects to the hanger on the bike can be oriented to any direction while the screw is loose. I have it oriented as in the picture because wheel insertion is affected with it any other way. My question is with the derailleur as pictured, will the shifting be normal once the cables are attached. Thanks.

kevindsingleton 

That looks a lot like the "wolf tooth" link that is used to drop a RD far enough to allow it to engage very large sprockets, like those in your cassette. I think it's going to be fine, once you get it all put together.

Leisesturm

Thanks! I wondered about that too. That is a 36T big cog. But they sell it this way, I have to assume they know it works. I will put everything together (40 years of cycling and I have never used a chain breaker...) and see what happens.

hermanchauw

That is a built-in roadlink/goatlink that drops the body mounting pivot lower than the frame's derailleur hanger. I also have one like that.

Note the cable angle of entry which is backward. Normal rd have the angle of entry forward.

dedhed

https://www.pinkbike.com/news/Shiman...railleurs.html

dsaul

That integrated hanger is necessary when using the Shadow type derailleur on a bike with a normal derailleur hanger. It can be removed for use on a frame with a "direct mount" hanger.

cobba

The 'bracket axle unit' or 'b-link' should be in a horizontal position.

Leisesturm

Thanks to recent posts I've cracked it. Thanks. The link to the 'Shadow Mount' product release were especially helpful. WRT post #11, the 'b-link' is indeed horizontal in some models (like pictured) but for mine the angle that is shown in my picture is correct, and there is a 'stop' built into the body of the link that sets it that way. Unfortunately before I knew better (i.e. before I started this thread). I attempted to remove the link and mount the derailleur body directly to the frame hanger. I've put it back of course, but it was held in by a thin 'circlip' that was destroyed as the mounting screw was backed out. It isn't really necessary, but... I'm anal that way. I assume everything exists for a reason. I probably will never check to make sure the screw remains tight, so my first warning of anything amiss will be when the derailleur tears loose from the mount and is mangled beyond repair, taking out the chain and several rear cogs with it...

cobba

Post a photo showing how you've attached the derailleur, with the bike standing upright on the ground.

When shadow derailleurs are attached the b-link should be in a near horizontal position, these derailleurs can also be attached where the b-link is in a more vertical position but this is a incorrect setup.

What model Deore derailleur is this?

xenologer

I dropped one of those on the floor once and never found it again.
Made what I hope is a reasonable substitute by cutting a section out of a washer and popping it on there.

Leisesturm

The photo I took in post #3 is of the bike standing upright on the ground, and the photo has been rotated so that what you see is exactly what I saw when I took the picture. I don't know what model of Deore, but clearly it is of the new 'Shadow Mount' variety. Everything I've read suggests that it is a mountain spec RD, but this is a road bike that it is mounted on. The bike is a Performer Saki 26" USS Highracer, if that helps. I intend to back out the mounting screw and loosen the 'b-link' and see if the 'stop' that is limiting its rearward sweep will clear the hanger and then allow it to reach a more horizontal aspect.

fietsbob

You have a Mountain multipivot rear mech.. the engineers have confused you. did you want a Road Triple RD instead, ?

cobba

The b-link should be able to rotate clockwise on the derailleur hanger if the derailleur takes a hit.

Page 12 shows correct mounting: https://si.shimano.com/pdfs/dm/DM-GN0001-20-ENG.pdf

Leisesturm

Thank you very much for being persistent! That view of the hanger from the back side shows me why the b-link stops where it does on my bike, and how I can easily fix it so that it mounts horizontal like it should. That pdf will also help immensely in setting up things once I get the cables connected and how to get the chain to the correct length. Interesting, Sheldon Brown mentioned years ago that adding two links to the chain wrapped around the big/big combination would properly set the chain length for the typical setup for the time (52/42 - 14-28) and I fully intended to second guess that because I was working with a wide range triple up front and an 11-36 10sp. I said to myself two extra links can't possibly be enough. I planned to add eight. At least eight. Reading through the pdf says add only two. Go figure. I owe you big time. Thanks again.

xenologer

It's really weird that your's is angled down so far.
Possible that the tooth on the tip of the hangar, versus the tooth on the end of the b-link are on the wrong side of each other?

maybe take a photo of the derailer hanger by itself, nothing mounted on it.

Leisesturm

Thanks to the link in post #17 I was able to not only sort out the b-link problem but cut the chain to length as well. Thanks also to everyone who offered advice. You guys rock.

trailangel

Cable housing is too short.

xenologer

yeah, you really need to fix that.
the housing isn't even long enough to seat in the housing stop up top.
better get a longer one and set it right before it falls out while riding.

Leisesturm

Yes, I already realize the housing is too short. Man you guy's don't miss a trick... maybe I should post the whole bike so you can tell me what else I've done wrong before I kill myself in traffic...