Thread: Di2 advice
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Old 01-19-15, 04:25 AM
  #10  
trailflow1
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Yes. the EW67A-E is a junction A box.

Its the rear derailleur which knows and determines which speed the system is. Up until recently you could upgrade a 10 speed 6770 system to 11 speed, If you bought a rear 6870 11 speed derailleur. I think Shimano have now clamped down on this by releasing a firmware update which prevents it from working.

Last edited by trailflow1; 01-19-15 at 05:06 AM.
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