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PostPosted: Wed Jul 22, 2015 8:36 pm 
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Joined: Mon Feb 25, 2013 11:10 am
Posts: 105
So my new build has gone tits up, just my luck the rear derailleur has completely failed anyone had the 6870 go on them ?

Shimano offer a 2 year warranty so all isn't bad, I originally bought it from starbike in Nov 2013 and other than battery drain (which looks like the RD was the culprit) its been awesome

I've ordered a spare medium cage so I can run a 32 sprocket #Hills etube didn't even find the RD after the fail !!

New pf30 shell out :-( lol teething problems


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Posted: Wed Jul 22, 2015 8:36 pm 


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PostPosted: Fri Jul 24, 2015 9:15 am 
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Battery is fully charged a few days on that's not happened for ages - looks like the issue all along

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PostPosted: Fri Jul 24, 2015 5:57 pm 
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Joined: Sat Jan 26, 2008 10:25 am
Posts: 262
Location: Cantabria
Can you please be more specific about what happens to your RD? You say it drains your battery?


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PostPosted: Sun Aug 02, 2015 8:42 am 
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Joined: Mon Feb 25, 2013 11:10 am
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XCProMD wrote:
Can you please be more specific about what happens to your RD? You say it drains your battery?

System is working 100% with new replacement RD, old unit must have not been shutting down correctly and draining the battery in 24hrs ! Maybe motor issue ? It's on its way back to Madison UK for a warranty claim

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PostPosted: Sun Aug 02, 2015 8:49 am 
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Joined: Mon Jun 02, 2003 8:17 am
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Location: Drenthe, Holland
I've seen this one more time and heard it at least a dozen. The issues in this case lies with the rear der draining the battery. a replacement usually fixes the issue.

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PostPosted: Sun Aug 02, 2015 1:31 pm 
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Joined: Sat Jan 26, 2008 10:25 am
Posts: 262
Location: Cantabria
Yes, it is a quite common fault. I'm trying to understand better what happens and I have 4 RDs here for inspection with that problem (2 Ultegra, 2DA).

At first glance it looks like it is another variation of the position reading system that was so common in DA7970. But now, instead of ghost shifting the noise causes the derailleur to alter position continuously albeit almost imperceptibly. The motor is humming all the time as a result and drains the battery.


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Posted: Sun Aug 02, 2015 1:31 pm 


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