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
Achetez la cassette Shimano Sora 9sp CS-HG50 | Cassettes
Cassette Shimano Sora CS-HG50 pour vélos 9 vitesses
Cassette vélo Shimano Sora HG400 11x25 - 9 vitesses - Cdiscount Sport
Cassette SHIMANO Sora 9v 11/30t CS-HG50-9
Cassette Shimano SORA 9 vitesses 11-28 VAN RYSEL | Decathlon