Di2 RD Problem...

Discuss light weight issues concerning road bikes & parts.
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ultimobici
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by ultimobici

laager wrote:This is very interesting and I'm also curious as to the final diagnosis and resolution.

In the meantime, I'm going to go and give my 2011 SR a great big hug. :lol:

It is indeed! I wonder how much working around Campagnolo's existing patents compromised DI2's reliability?

by Weenie


Ruds
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Joined: Thu Jan 25, 2007 3:56 pm

by Ruds

Hey guys, apologies for not checking on this post for so long, I really appreciated the help I got trying to isolate this problem.

I ended up buying a new Di2 RD ASAP and replacing it. my Di2 on my road and TT bike has worked flawlessley aside from this problem which I think could have been caused by the crash. I think it may have just been bad luck when it did start malfunctioning 6 months after the crash, I have no way of telling how close it was to failing before this, maybe it was just a particular bike washing episode that allowed water in through a crack or damaged spot that had until then luckily avoided it :noidea:

It was expensive and I'll admit to being lazy when it comes to sending stuff in for warrenty work, but I ride my bike every day, and get most things (Shimano included) at trade price through a friend.

I don't know how common these problems are with Di2, I really enjoy using Di2 so this hasn't put me off.

In it's defence although the RD only had scuffs to it and I was able to ride an home without any adjustments to the RD I have no idea how hard it hit the road. I needed 18 stitches in my hip from the crash so it did better than me :thumbup:

Johhny Bravo
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Location: Minas Gerais, Brazil

by Johhny Bravo

one more here...

history: 2 years old external wired DA Di2 installed on a Scott Addict R2
bike used almost daily, 30-80mi/day (depending on training schedule)
for the last 30 days I haven´t cleaned it up and the bb area (and wires) is very very very dirty (dry mud, it´s been raining sometimes)
NEVER crashed

2 days ago I noticed something was wrong, it happened only 3-4 times and then continued to work fine
but today the problem showed up frequently and I could replicate it at home
I thought it could be the battery, but I charged it and the problem is still there

here´s what´s happening:
everytime I shift the RD, it moves the chain to the next sprocket correctly - BUT after a few seconds, the junction box blinks red twice and then the derailleur moves by itself again in the direction I had shifted before (up or down) - causing another (unwanted) shift...
my RD is ghost shifting...

as others have mentioned, I think I have a faulty RD too.
but isn´t it kinda "strange" that it´s happening after about 2 years of use - like with some other people who related the issue?

now let´s try to have it solved under warranty...
Ride safe!
Eduardo
2011 Look 695 SR

LionelB
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Location: Aix en Provence

by LionelB

hum... I hope Shimano takes care of you quickly.

civdic
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Joined: Thu Feb 10, 2011 8:58 pm

by civdic

Try blowing out the connection at DR with compressed air. I had a riding buddy that had some rear DR issues and he had pulled the wire out when pulling it off a car rack and quickly pushed the wire back in before the ride. He didn't end up pressing the wire fully in and weeks later he had shifting issues. He inspected the DR to find moisture and dirt in the connection. It was cleaned with a q-tip and a bit of electronic connection cleaner and it works without issues again.

Johhny Bravo
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by Johhny Bravo

thanks civdic, i will give it a try
Ride safe!
Eduardo
2011 Look 695 SR

Johhny Bravo
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by Johhny Bravo

here's a video of the malfunction:

http://www.youtube.com/watch?v=QrIY0hm2RBw&feature=plcp

Despite Shimano International says Dura Ace components have a 3-year warranty, Shimano Brasil refused to take care of the problem - and claimed that the warranty is for 1-year only... go figure...
Ride safe!
Eduardo
2011 Look 695 SR

Geoff
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by Geoff

Thanks for posting that video. We have heard lots of talk about the 'ghost' shifting, but that is the first time we have actually seen it. Have you sent that to Shimano in Japan?

Johhny Bravo
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Location: Minas Gerais, Brazil

by Johhny Bravo

i couldn't find an email address from shimano japan to send them the link...
Ride safe!
Eduardo
2011 Look 695 SR

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yourdaguy
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by yourdaguy

Not only is it ghost shifting, but it seems a little slow on the shifts compared to other 7970 systems I have seen.
For certain parts stiffer is more important than lighter.

egebhardt
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Joined: Wed Mar 19, 2008 8:38 pm

by egebhardt

Just bought a DA 7970 group (via PayPal - goods or services) on Craigslist.

The seller said the front junction box was faulty. It arrived. I plugged it all in. SURPRISE!!

The rear derailleur is FUNKY!

The rear derailleur moves down (smaller cogs) 3 or 4 or 5 gears.. Then stops and inches down more.
If you shift up (bigger cogs) it goes 1 and stops. Then inches slowly to the top and the front junction blinks red 5 times.

It's FUBAR'd. He didn't think I would notice? He doesn't think PayPal will give me my money back?

I called Shimano USA (irvine california) and asked some basic questions. Their response it that it is broken and needs to be replaced. End of story. No warranty now that it's past 3 yrs old.
Eric in San Carlos, CA

petal666
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by petal666

I had 2 or 3 RD fail in this manor, and have heard of many others. I'm sure it would be fixable if you could get into the RD. Lucky I stockpiled a few spare RDs in the last year or so. :)

Pottsy
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Joined: Mon Dec 08, 2014 11:54 am

by Pottsy

egebhardt wrote:Just bought a DA 7970 group

There's the first problem, you bought an obsolete groupset.

junction box was faulty

Second problem. 7970 parts are very hard to find.

Just stay clear of it.
S-Works Venge
S-Works Crux - RIP
S-Works Allez
Crux Bunny Hopper
Slate Cx1

XCProMD
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by XCProMD

Johhny Bravo wrote:here's a video of the malfunction:

http://www.youtube.com/watch?v=QrIY0hm2RBw&feature=plcp" onclick="window.open(this.href);return false;

Despite Shimano International says Dura Ace components have a 3-year warranty, Shimano Brasil refused to take care of the problem - and claimed that the warranty is for 1-year only... go figure...


Known problem. It happened to me with two different 7970 derailleurs, but I have seen more cases.

The most usual cause is the potentiometer used to check position of the derailleur givng a noisy signal.

There is no easy fix and Shimano will never accept a claim.

kode54
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by kode54

@ yourdaguy

also, don't forget to realign your RD hanger since you had a crash. that can wreck havoc as well down the road, so to speak.
- AX Lightness Vial EVO D + DA9150 + Enve SES 3.4 carbon hubs
- Parlee Altum + DA9150 + Enve SES 4.5 carbon hubs
- Parlee ESX + DA9150 + THM SRM PM + Enve SES 6.7 CK hubs
- Independent Fabrication Ti FLW + DA9100 + Enve 3.4 CK hubs

by Weenie


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