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Di2 Anti-Cross Chaining Program Change - Is there an override?

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Di2 Anti-Cross Chaining Program Change - Is there an override?

Old 01-10-18, 07:41 PM
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Di2 Anti-Cross Chaining Program Change - Is there an override? (yes)

I just updated my Shimano e-Tube software to version 3.3.2. At the same time, I made the switch from 6870 GS to the R8050 GS rear derailleur. All is well, except:


1. The new software prevents going into the two smallest cogs when the chain is on the small chainring.


2. The new e-Tube software doesn't appear to allow changing the "Gear Position Control" to "Do not set." (That was the setting for those of us who like to start steep climbs in the small ring, but with as much momentum as possible from pushing the smallest cog.)


e-Tube 3.3.2 shows the "Gear Position Control" as "Set." I can't find a way to change or override it. Does anyone know a magic trick (or even a non-magic trick)?

Last edited by FlashBazbo; 01-11-18 at 07:14 PM.
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Old 01-10-18, 09:14 PM
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I think you can’t be in either full or semi Synchro mode, only manual.
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Old 01-10-18, 09:51 PM
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Originally Posted by Steve B.
I think you can’t be in either full or semi Synchro mode, only manual.

Nope. It doesn't work in manual, either. (I've never had this bike in either synchro mode. I don't like the synchro patterns.)

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Old 01-11-18, 07:49 AM
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I've been following this and the sibling in Road, even though electronic shifting isn't on my radar. Would be interesting if Shimano has decided "you just aren't doing that with our stuff." Keep us updated!
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Old 01-11-18, 08:05 AM
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Originally Posted by shelbyfv
I've been following this and the sibling in Road, even though electronic shifting isn't on my radar. Would be interesting if Shimano has decided "you just aren't doing that with our stuff." Keep us updated!
Even though I mostly agree with Shimano's reasoning, they do it at their peril since SRAM's marketing could well be "go ahead and cross-chain with our stuff! We'll design around it!"
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Old 01-11-18, 06:31 PM
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Originally Posted by shelbyfv
I've been following this and the sibling in Road, even though electronic shifting isn't on my radar. Would be interesting if Shimano has decided "you just aren't doing that with our stuff." Keep us updated!


WE HAVE A SOLUTION! If you set the programming up in e-Tube for a 53/39 crankset (regardless of your actual crankset), the option to change the Gear Position Control from "Set" to "Do not set" becomes active. When the "Do not set" option is chosen, you can crosschain with impunity in both directions. And even if your crankset is 52/36 or 50/34, the front will shift fine.


One thing to note in the "Do not set" mode . . . it is best for those of us who ONLY use the "standard" manual shifting pattern. "Do not set" narrows the synchro shift patterns to near meaninglessness. (Semi-synchro with this setting only shifts one cog when you shift chainrings.) Since I don't use synchro shifting, the change in patterns doesn't bother me.


(Credit for this answer goes to Fiery on this forum.)
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Old 01-11-18, 06:36 PM
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It's sounding like an issue of Shimano overthinking what parts it thinks the system has in terms of will a chain, with a GS derailer and a 34/50 crank, potentially be too long and possibly damage the RD if you use small/small. So the system, knowing you have an 11-28 assumes X amount of chain length (if set to Shimano spec.) and the system doesn't like the 34/11 or 34/12 combo's. Thus setting to a larger crank is telling the system that with that chain length, all is OK.
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Old 01-11-18, 06:37 PM
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Congratulations @FlashBazbo.

I'm glad you got it worked out and thanks for plowing the road for the rest of us.


-Tim-
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