Is this Sora rear derailleur (rd r3000 gs) actually compatible with 8 speed cassette or is it seller mistake? Can't find any other information online. : r/bikewrench
DYNA-SYS11 | SHIMANO BIKE COMPONENT
1x12 Compatibility Guide - Ratio Technology
Shimano cues derailleur : r/gravelcycling
Trikes and (odd) bikes.: 2nd December 2015 Shimergo double pully, cable pull ratio converter.
Shimano/Campagnolo/SRAM compatibility chart - and a quick question about using 10 speed Campy brifters with an 8 speed XTR rear mech : r/bikewrench