In this video you will find out how to achieve a 585%, ultra-wide range 2x11 using an 11-42 cassette with a Shimano GRX 815 or 810 derailleur. We tested three different cassette ranges and the limits of the GRX derailleurs in this how-to video.
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More on 1x Mullet Drivetrains: https://bikepacking.com/gear/guide-to-mullet-drivetrains/