10 spd clutch derailleur conversion for 9 spd - Pinkbike Forum
LTWOO – ensemble de vitesses pour vtt, 1x9 vitesses, dérailleur arrière A5 9 s 11-36/40/
Can I Use A 9-Speed Derailleur With An 8-Speed Cassette? | BikeRenovate
X7 Rear Derailleur | RD-X7-A1 | SRAM
In case anyone is wondering, on a Sora 9-speed derailleur, you can fit a 42 tooth sprocket and a 11-42 cassette with no issues. Shown on a 2016 Trek Crossrip Elite. : r/gravelcycling
Will a 9-speed Derailleur Work On a 10-speed Cassette? (detailed explanation) – Brainy Biker