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I am using both a short and medium cage 6870 rear mech with NW chainrings (50t and 36t)
Has worked flawlessly, although the max I have used is a 32t so far.
danb-
nice one, thanks! Have you 'hacked' the mech to increased its spring tension .. I know there is a provision for this in mechanical versions, not sure about Di2.
The 36 shouldn't be an issue according to this: http://www.gravelcyclist.com/bicycle-tech/bike-tinkering-101-attempting-the-impossible/
amey
@andyp are you using Ultegra Di2 rear mech with NW chainring? Although I love the idea of XTR the price is double the long cage 6870 mech .. if I can get away with B tension adjustment and 11-36 with long cage I'll go for it .. plus I remember @Dammit saying that XTR mech doesn't connect via etube or something.