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PostPosted: Tue Aug 06, 2013 2:20 pm 
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Joined: Wed Jan 10, 2007 10:56 pm
Posts: 685
Location: Canada
I've installed a large number of di2 systems with various chainring combos and have never had the experience where it shifts like that on the stand but good on the road. I still don't get why eps would be any different.

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PostPosted: Tue Aug 06, 2013 4:05 pm 
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Joined: Sun Jan 03, 2010 4:58 am
Posts: 558
The issue is when the crank is spinning with a low load [probably low speed]. The force the electric derailleur can deliver will jamb the chain into the larger gear and prevent you from turning the crank [by hand]. This is the unknown that we cannot figure out. When I first operated the front derailleur I noticed this too. You have to be moving the crank and with some force so when the derailleur is operated, it will move the chain into the teeth and walk around the crank.

When you operate a mechanical system, I do not believe you will operate the shifter as hard you can and therefore there is a little finesse with the shifter and crank movement.

Kinda like this, My electric shifter will jamb the chain to the big ring everytime I do not rotate the crank, why is that?
Move the crank with some force and it will shift. Soon we will get an answer from the poster, but until then, we all will be bashing a question we really do not understand fully.


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Posted: Tue Aug 06, 2013 4:05 pm 
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PostPosted: Tue Aug 06, 2013 6:23 pm 
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Joined: Sun Jul 22, 2012 7:17 pm
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I've seen videos of EPS' front shifting fine under light crank rotation on a stand. Sounds like a misalignment or fault.


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PostPosted: Tue Aug 06, 2013 6:33 pm 
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Joined: Wed Jan 10, 2007 10:56 pm
Posts: 685
Location: Canada
All I am saying is that on the stand i can turn the cranks so slow they are barely moving and I still get good shifts. I cannot make the chain lockup as you describe. Tried on both my di2 bikes. Praxis 52/36 rings. Di2 9070 and 7970.

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