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I fitted an XT 11-40 to my bike yesterday with the new ultegra long cage di2 rear mech. Fits fine without a roadlink and I even backed the b-screw off a bit. I took a few links out of a new 116 link chain and it's good. Running 46-34 at the front and Di2 stops you cross chaining in the little ring anyway.
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Nice. I've already got a 118 link chain, I just need the Compact chainrings and I'll fit it up. I need to have another look at the Di2 auto-shift options, I think mine is turned off currently so I can still cross chain. Not that I do but I'm worried I'll freak out when it stops shifting half way across the cassette or something.
Am I even going to need a Wolftooth if I've got the newer Di2 Ultegra RD?
https://www.youtube.com/watch?v=roUXWvAN-9k
https://www.youtube.com/watch?v=P5G_KtK3LVk