Always used to be one distance for road, another for mtb, but some cx and gravel bikes split the difference, and mtbs with throughaxles are going to directmount...
I'll try it without first and see what happens. I need to order some chainrings and bodge a cassette first.
6870GS works fine with 11-40 on a Straggler, which (afaik) has a standard MTB-length hanger.
Shimano diagram about dropout/hanger geometry here
@hippy started
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Always used to be one distance for road, another for mtb, but some cx and gravel bikes split the difference, and mtbs with throughaxles are going to directmount...