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hippy
Bob_Thod
but what was the difference in teeth on your front rings? You run a 34/48 right?
In my testing on an 11/42 rear, once you add the extra chain links, and have a 16 tooth difference up front, the R8000/RX800 rear mech starts to be unhappy in the smaller cogs due to the short cage length. Like when running small to small front and rear rings.
If you have 34/48 = 14T or a 34/46 = 12T, the mech stretches its leg more, has more spring tension and thus keeps the chain more taut.