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Yes, that is in the manual for Shimano RDs, for cassettes with a maximum 27T sprocket. It does work in those limited circumstances - a Shimano RD, a big sprocket ≤27T and a double chainset with no more than 16T difference. The thing is, the other method works for everything, so which would you rather learn?
gbj_tester
Emyr
I seem to recall in the RD-6800 manual there were two methods based on what your largest sprocket was...one was the big-big, and the other was about the line crossing through the jockey wheels being perpendicular to the ground.