6870 was the first 11 speed Ultegra di2 rear derailleur. 6770 was 10 speed di2 (etube). 8050 is the new 11 speed di2 Ultegra one.
Right so I have 6870 shit and I want 8050 shit. No wonder the parts looked the same. I was googling the wrong frickin' number. 100% don't want any 10spd or dead DA stuff.
@hippy started
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6870 was the first 11 speed Ultegra di2 rear derailleur. 6770 was 10 speed di2 (etube).
8050 is the new 11 speed di2 Ultegra one.