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Old 02-23-2019, 04:30 PM
dem dem is offline
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Join Date: Apr 2013
Location: Santa Cruz Foothills
Posts: 761
Yup, I have 11-40 on both a 6800 Di2+Wolftooth, and an R8000-GS (same geo as the Di2)

You can also go 1X as indicated with the XTR RD.. but you CANNOT mix a road FD and a MTB RD as a double, Shimano firmware will not allow it.
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